Removing Z from Lighting — Handmade Hero — Episode Guide

0:00Welcome to the stream, with admiration of our lighting

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0:00Welcome to the stream, with admiration of our lighting

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0:00Welcome to the stream, with admiration of our lighting

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0:52Consider lighting improvements, e.g. speeding up our long-term average blend

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0:52Consider lighting improvements, e.g. speeding up our long-term average blend

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0:52Consider lighting improvements, e.g. speeding up our long-term average blend

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1:3870% frame time on ComputeLightPropagationWork

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1:3870% frame time on ComputeLightPropagationWork

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1:3870% frame time on ComputeLightPropagationWork

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2:50Moving to 2D lighting

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2:50Moving to 2D lighting

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2:50Moving to 2D lighting

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3:01Moving to 2D lighting: 1) Eliminating Z-stacking

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3:01Moving to 2D lighting: 1) Eliminating Z-stacking

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3:01Moving to 2D lighting: 1) Eliminating Z-stacking

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3:17Reducing the lighting voxel memory footprint

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3:17Reducing the lighting voxel memory footprint

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3:17Reducing the lighting voxel memory footprint

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7:00Decrease LIGHT_LOOKUP_VOXEL_DIM_Z from 16 to 1

7:21Check the ramifications of removing Z from the lighting

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7:21Check the ramifications of removing Z from the lighting

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7:21Check the ramifications of removing Z from the lighting

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14:51Toggle on lighting voxel drawing in PushLightingRenderValues()

16:01Our world is completely black

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16:01Our world is completely black

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16:01Our world is completely black

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16:29Increase LIGHT_LOOKUP_VOXEL_DIM_Z from 1 to 8

16:34Our world is lit

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16:34Our world is lit

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16:34Our world is lit

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16:46Decrease LIGHT_LOOKUP_VOXEL_DIM_Z from 8 to 4

16:54Our world remains lit

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16:54Our world remains lit

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16:54Our world remains lit

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16:57Decrease LIGHT_LOOKUP_VOXEL_DIM_Z from 4 to 2

17:09Our world remains lit

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17:09Our world remains lit

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17:09Our world remains lit

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17:14Decrease LIGHT_LOOKUP_VOXEL_DIM_Z from 2 to 1

17:22Is the voxel too thin to pick up light sources?

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17:22Is the voxel too thin to pick up light sources?

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17:22Is the voxel too thin to pick up light sources?

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17:43Increase LIGHT_LOOKUP_VOXEL_DIM_Z from 1 to 2

17:52Consider keeping the lighting voxel 2-high, with vertical movement sampling fixed

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17:52Consider keeping the lighting voxel 2-high, with vertical movement sampling fixed

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17:52Consider keeping the lighting voxel 2-high, with vertical movement sampling fixed

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19:14Plan our Z-elimination strategy

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19:14Plan our Z-elimination strategy

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19:14Plan our Z-elimination strategy

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21:49Try making UpdateLighting() zero out all the incoming Z-values

22:36Our lighting bounds are relatively too low, but tall enough

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22:36Our lighting bounds are relatively too low, but tall enough

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22:36Our lighting bounds are relatively too low, but tall enough

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24:03Check the call stack of UpdateLighting() for sources of Z

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24:03Check the call stack of UpdateLighting() for sources of Z

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24:03Check the call stack of UpdateLighting() for sources of Z

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25:19Prevent UpdateLighting() from zeroing out all the incoming Z-values

25:26Check where to clamp Z

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25:26Check where to clamp Z

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25:26Check where to clamp Z

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27:50Toggle on WorldCameraRect drawing in UpdateAndRenderWorld()

28:06Check out our camera and lighting volumes

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28:06Check out our camera and lighting volumes

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28:06Check out our camera and lighting volumes

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29:19Make UpdateAndRenderWorld() draw a -1 to 1 origin cube

30:05Check out our -1 to 1 origin cube

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30:05Check out our -1 to 1 origin cube

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30:05Check out our -1 to 1 origin cube

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31:15Determine to lock the simulation center Z

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31:15Determine to lock the simulation center Z

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31:15Determine to lock the simulation center Z

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33:05Try making UpdateCameraForEntityMovement() set SimulationCenter.Z to 0

33:29The game looks good

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33:29The game looks good

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33:29The game looks good

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33:40Consider drawing the simulation region

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33:40Consider drawing the simulation region

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33:40Consider drawing the simulation region

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34:09The simulation region does not follow us downstairs

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34:09The simulation region does not follow us downstairs

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34:09The simulation region does not follow us downstairs

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35:03Make UpdateAndRenderWorld() zero out the LightingCenter.ChunkZ and LightingCenter.Offset_.z

36:15The camera bounds wobble

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36:15The camera bounds wobble

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36:15The camera bounds wobble

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37:44Assert in UpdateLighting() that Z is 0

38:54Never hit our assertions in UpdateLighting()

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38:54Never hit our assertions in UpdateLighting()

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38:54Never hit our assertions in UpdateLighting()

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39:27Consider making Z == 0 the lowest point in the world

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39:27Consider making Z == 0 the lowest point in the world

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39:27Consider making Z == 0 the lowest point in the world

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40:49Consider Z simplifications

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40:49Consider Z simplifications

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40:49Consider Z simplifications

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42:30Reacquaint ourselves with the alignment code in UpdateLighting

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42:30Reacquaint ourselves with the alignment code in UpdateLighting

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42:30Reacquaint ourselves with the alignment code in UpdateLighting

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43:45Determine to keep Z == 0 at the center point

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43:45Determine to keep Z == 0 at the center point

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43:45Determine to keep Z == 0 at the center point

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45:57Make GetTotalVolume() offset the MinP negatively by half a tile

48:18Our world is lit again

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48:18Our world is lit again

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48:18Our world is lit again

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50:16Make GetTotalVolume() zero out the MinP.Z

51:12Our world looks fine, but the lighting and camera are offset

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51:12Our world looks fine, but the lighting and camera are offset

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51:12Our world looks fine, but the lighting and camera are offset

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51:39Investigate why the camera is incorrectly positioned

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51:39Investigate why the camera is incorrectly positioned

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51:39Investigate why the camera is incorrectly positioned

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54:27Make UpdateAndRenderWorld() set FocusZ to 0

54:46Our camera remains incorrectly positioned

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54:46Our camera remains incorrectly positioned

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54:46Our camera remains incorrectly positioned

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55:05Reacquaint ourselves with FocusZ relativity

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55:05Reacquaint ourselves with FocusZ relativity

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55:05Reacquaint ourselves with FocusZ relativity

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56:37Simplify the FocusZ values in game_camera down to ExpectedFocusZ

1:01:50Make UpdateAndRenderWorld() compute ExpectedFocusZ

1:09:18Our camera remains incorrectly positioned

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1:09:18Our camera remains incorrectly positioned

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1:09:18Our camera remains incorrectly positioned

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1:09:37Reacquaint ourselves with GetCameraRectangleAtDistance()

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1:09:37Reacquaint ourselves with GetCameraRectangleAtDistance()

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1:09:37Reacquaint ourselves with GetCameraRectangleAtDistance()

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1:10:47Break in to UpdateAndRenderWorld() in -Od, and inspect CameraZ and DeltaFromSim

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1:10:47Break in to UpdateAndRenderWorld() in -Od, and inspect CameraZ and DeltaFromSim

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1:10:47Break in to UpdateAndRenderWorld() in -Od, and inspect CameraZ and DeltaFromSim

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1:13:10Reacquaint ourselves with UpdateCameraForEntityMovement()

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1:13:10Reacquaint ourselves with UpdateCameraForEntityMovement()

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1:13:10Reacquaint ourselves with UpdateCameraForEntityMovement()

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1:15:30Break in to UpdateCameraForEntityMovement(), and never enter the InRoom branch

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1:15:30Break in to UpdateCameraForEntityMovement(), and never enter the InRoom branch

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1:15:30Break in to UpdateCameraForEntityMovement(), and never enter the InRoom branch

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1:16:04Reacquaint ourselves with the procedural generation code in terms of Z

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1:16:04Reacquaint ourselves with the procedural generation code in terms of Z

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1:16:04Reacquaint ourselves with the procedural generation code in terms of Z

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1:19:55Make BeginGridEdit() enlarge rooms by 5 units in Z

1:20:52Enter the InRoom branch in UpdateCameraForEntityMovement()

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1:20:52Enter the InRoom branch in UpdateCameraForEntityMovement()

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1:20:52Enter the InRoom branch in UpdateCameraForEntityMovement()

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1:21:03Our camera is now correctly positioned, and our frame rate is far higher

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1:21:03Our camera is now correctly positioned, and our frame rate is far higher

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1:21:03Our camera is now correctly positioned, and our frame rate is far higher

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1:21:40~30% frame time on ComputeLightPropagationWork, but our fogging is incorrect

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1:21:40~30% frame time on ComputeLightPropagationWork, but our fogging is incorrect

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1:21:40~30% frame time on ComputeLightPropagationWork, but our fogging is incorrect

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1:23:05Make UpdateAndRenderWorld() set the camera's fogging FocusMinZ and FocusMaxZ based on the ExpectedFocusZ

1:24:55Our focused level is no longer fogged out

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1:24:55Our focused level is no longer fogged out

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1:24:55Our focused level is no longer fogged out

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1:25:28Determine to position light probes relative to the floor and ceiling

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1:25:28Determine to position light probes relative to the floor and ceiling

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1:25:28Determine to position light probes relative to the floor and ceiling

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1:27:16Make UpdateLighting() call DebugDrawOctahedralValues()

1:29:14Hit a read access violation on DebugDrawColorDir()

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1:29:14Hit a read access violation on DebugDrawColorDir()

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1:29:14Hit a read access violation on DebugDrawColorDir()

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1:29:53Hit a read access violation on Texel.Value in DebugDrawColorDir() in -Od

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1:29:53Hit a read access violation on Texel.Value in DebugDrawColorDir() in -Od

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1:29:53Hit a read access violation on Texel.Value in DebugDrawColorDir() in -Od

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1:30:36Fix DebugDrawOctahedralValues() to account for our "Z-less" world

1:31:23Run correctly

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1:31:23Run correctly

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1:31:23Run correctly

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1:31:41Check out our light probes in -O2

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1:31:41Check out our light probes in -O2

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1:31:41Check out our light probes in -O2

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1:32:26Try letting DebugDrawOctahedralValues() draw all the light probes

1:32:41Hit our "overflow" assertion in PushQuad()

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1:32:41Hit our "overflow" assertion in PushQuad()

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1:32:41Hit our "overflow" assertion in PushQuad()

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1:32:44Try making DebugDrawOctahedralValues() draw half the light probes

1:32:54Check out our light probes, with potential bugs

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1:32:54Check out our light probes, with potential bugs

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1:32:54Check out our light probes, with potential bugs

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1:34:08Make UpdateAndRenderEntities() draw the colliders

1:34:44Based on the colliders, our light probes look buggy

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1:34:44Based on the colliders, our light probes look buggy

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1:34:44Based on the colliders, our light probes look buggy

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1:37:43Reflect on our lighting simplifications, and consider next steps

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1:37:43Reflect on our lighting simplifications, and consider next steps

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1:37:43Reflect on our lighting simplifications, and consider next steps

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1:40:00Consider removing spatial partitioning of our 2D lighting grid, raycasting directly on it

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1:40:00Consider removing spatial partitioning of our 2D lighting grid, raycasting directly on it

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1:40:00Consider removing spatial partitioning of our 2D lighting grid, raycasting directly on it

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1:43:25Determine to investigate our buggy light probes

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1:43:25Determine to investigate our buggy light probes

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1:43:25Determine to investigate our buggy light probes

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1:45:24Force all light probes through the not-inside branch in FullCast()

1:45:53Those buggy light probes now pick up light

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1:45:53Those buggy light probes now pick up light

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1:45:53Those buggy light probes now pick up light

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1:46:12Let light probes enter the inside branch in FullCast()

1:46:32Consider debugging versus simplifying the spatial partition for raycasting

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1:46:32Consider debugging versus simplifying the spatial partition for raycasting

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1:46:32Consider debugging versus simplifying the spatial partition for raycasting

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1:50:00Simplifying raycasting spatial partition: 1) Removing Z

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1:50:00Simplifying raycasting spatial partition: 1) Removing Z

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1:50:00Simplifying raycasting spatial partition: 1) Removing Z

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1:50:12Simplifying raycasting spatial partition: 2) Turning it into a grid

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1:50:12Simplifying raycasting spatial partition: 2) Turning it into a grid

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1:50:12Simplifying raycasting spatial partition: 2) Turning it into a grid

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1:50:28Plan to remove Z from GridBuildSpatialPartition()

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1:50:28Plan to remove Z from GridBuildSpatialPartition()

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1:50:28Plan to remove Z from GridBuildSpatialPartition()

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1:54:36Step in to UpdateLighting() and inspect the VoxCellDim and SpatialCellCount

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1:54:36Step in to UpdateLighting() and inspect the VoxCellDim and SpatialCellCount

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1:54:36Step in to UpdateLighting() and inspect the VoxCellDim and SpatialCellCount

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1:57:52Make UpdateLighting() set the AtlasToSpatialGridIndexOffset.Z to 0

1:58:47Make PushLightingRenderValues() draw the spatial grid

1:59:07Our spatial grid is too low

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1:59:07Our spatial grid is too low

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1:59:07Our spatial grid is too low

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1:59:39Make UpdateLighting() give the spatial grid three layers of height

2:00:38Our spatial grid remains too low

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2:00:38Our spatial grid remains too low

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2:00:38Our spatial grid remains too low

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2:00:53Reacquaint ourselves with the spatial grid alignment code

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2:00:53Reacquaint ourselves with the spatial grid alignment code

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2:00:53Reacquaint ourselves with the spatial grid alignment code

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2:01:53Make UpdateLighting() offset the spatial grid in Z by a third of the usual amount

2:02:12Our spatial grid is now correctly aligned

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2:02:12Our spatial grid is now correctly aligned

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2:02:12Our spatial grid is now correctly aligned

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2:02:45Remove the Z loop from ComputeWalkTable(), respecifying GetOctantFor() as GetQuadrantFor()

2:10:18Hit our assertion in GetQuadrantFor()

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2:10:18Hit our assertion in GetQuadrantFor()

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2:10:18Hit our assertion in GetQuadrantFor()

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2:11:16Make FullCast() zero out the Remainder.z

2:11:47Our quadrant table should be being computed correctly

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2:11:47Our quadrant table should be being computed correctly

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2:11:47Our quadrant table should be being computed correctly

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2:13:57Step through FullCast() watching that HalfAtlasIndex.z remains 0

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2:13:57Step through FullCast() watching that HalfAtlasIndex.z remains 0

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2:13:57Step through FullCast() watching that HalfAtlasIndex.z remains 0

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2:16:01Determine to inspect the spatial partition

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2:16:01Determine to inspect the spatial partition

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2:16:01Determine to inspect the spatial partition

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2:17:04Disable light probe direction drawing in DebugDrawOctahedralValues()

2:17:33Check out our light probe boxes

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2:17:33Check out our light probe boxes

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2:17:33Check out our light probe boxes

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2:17:44Try making DebugDrawOctahedralValues() draw all the light probes

2:17:58Check out our complete set of light probes

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2:17:58Check out our complete set of light probes

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2:17:58Check out our complete set of light probes

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2:18:06Relieve UpdateAndRenderEntities() of drawing the colliders

2:18:15Check our set of debug visualisation

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2:18:15Check our set of debug visualisation

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2:18:15Check our set of debug visualisation

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2:18:31Introduce DebugDrawSpatialGrid() for UpdateLighting() to call

2:21:34Check out our spatial grid, with eight probes per cell

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2:21:34Check out our spatial grid, with eight probes per cell

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2:21:34Check out our spatial grid, with eight probes per cell

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2:23:02Make DebugDrawSpatialGrid() checkerboard the spatial grid colouring

2:24:27Check out our checkerboard spatial grid

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2:24:27Check out our checkerboard spatial grid

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2:24:27Check out our checkerboard spatial grid

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2:24:38Make DebugDrawSpatialGrid() enlarge the cells slightly

2:25:43Check out our enlarged checkerboard spatial grid

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2:25:43Check out our enlarged checkerboard spatial grid

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2:25:43Check out our enlarged checkerboard spatial grid

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2:26:10Fix DebugDrawSpatialGrid() to shrink the cells

2:26:22Check out our shrunken checkerboard spatial grid

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2:26:22Check out our shrunken checkerboard spatial grid

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2:26:22Check out our shrunken checkerboard spatial grid

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2:26:47Make DebugDrawSpatialGrid() draw the leaves

2:32:36Try to view our spatial grid leaves

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2:32:36Try to view our spatial grid leaves

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2:32:36Try to view our spatial grid leaves

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2:32:46Prevent DebugDrawSpatialGrid() from drawing the cell boundaries

2:33:13Our spatial grid contains no leaves

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2:33:13Our spatial grid contains no leaves

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2:33:13Our spatial grid contains no leaves

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2:33:19Scour GridBuildSpatialPartition() for bugs

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2:33:19Scour GridBuildSpatialPartition() for bugs

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2:33:19Scour GridBuildSpatialPartition() for bugs

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2:34:26Fix GridBuildSpatialPartition() to retain Z in the ClippingRegion

2:34:59Our spatial grid still contains no leaves

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2:34:59Our spatial grid still contains no leaves

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2:34:59Our spatial grid still contains no leaves

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2:35:20Scour GridBuildSpatialPartition() for bugs (cont.)

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2:35:20Scour GridBuildSpatialPartition() for bugs (cont.)

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2:35:20Scour GridBuildSpatialPartition() for bugs (cont.)

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2:36:14Assert(Z == 0) in GridBuildSpatialPartition()

2:36:31Scour GridBuildSpatialPartition() for bugs (cont.)

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2:36:31Scour GridBuildSpatialPartition() for bugs (cont.)

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2:36:31Scour GridBuildSpatialPartition() for bugs (cont.)

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2:37:04Fix GridBuildSpatialPartition() to not consider Z as part of the apron

2:37:33Hit our "overflow" assertion in PushQuad()

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2:37:33Hit our "overflow" assertion in PushQuad()

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2:37:33Hit our "overflow" assertion in PushQuad()

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2:37:45Toggle off DebugDrawOctahedralValues() in UpdateLighting()

2:38:12Check out the spatial partition leaves of our lit world

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2:38:12Check out the spatial partition leaves of our lit world

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2:38:12Check out the spatial partition leaves of our lit world

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2:41:53Check GridRayCast() for the source of light emission

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2:41:53Check GridRayCast() for the source of light emission

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2:41:53Check GridRayCast() for the source of light emission

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2:43:20Leave a TODO to handle light probes inside a light source

2:44:26Try to make sense of the tangled mess of spatial partition leaves

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2:44:26Try to make sense of the tangled mess of spatial partition leaves

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2:44:26Try to make sense of the tangled mess of spatial partition leaves

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2:45:41Toggle off DebugDrawSpatialGrid() in UpdateLighting()

2:46:00Check out the world's lighting, at 16ms per frame

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2:46:00Check out the world's lighting, at 16ms per frame

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2:46:00Check out the world's lighting, at 16ms per frame

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2:47:18Increase tUpdateBlend from 1/60 to 30/60 in UpdateLighting()

2:47:30Our lighting flickers

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2:47:30Our lighting flickers

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2:47:30Our lighting flickers

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2:48:15Decrease tUpdateBlend from 30/60 to 15/60 in UpdateLighting()

2:48:27Our lighting still flickers

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2:48:27Our lighting still flickers

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2:48:27Our lighting still flickers

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2:48:41Decrease tUpdateBlend from 15/60 to 5/60 in UpdateLighting()

2:49:03Our lighting flicker may be eliminated by casting four times as many rays

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2:49:03Our lighting flicker may be eliminated by casting four times as many rays

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2:49:03Our lighting flicker may be eliminated by casting four times as many rays

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2:50:09Increase tUpdateBlend from 5/60 to 20/60 in UpdateLighting()

2:50:36Our shading rate is pretty responsive

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2:50:36Our shading rate is pretty responsive

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2:50:36Our shading rate is pretty responsive

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2:51:32Reacquaint ourselves with GridRayCast()

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2:51:32Reacquaint ourselves with GridRayCast()

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2:51:32Reacquaint ourselves with GridRayCast()

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2:56:14Reacquaint ourselves with the entropy-based light sampling

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2:56:14Reacquaint ourselves with the entropy-based light sampling

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2:56:14Reacquaint ourselves with the entropy-based light sampling

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2:56:50Remove EntropyFrameCount and LightPointEntropy

2:57:51Reacquaint ourselves with the entropy-based light sampling (cont.)

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2:57:51Reacquaint ourselves with the entropy-based light sampling (cont.)

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2:57:51Reacquaint ourselves with the entropy-based light sampling (cont.)

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2:58:53Try making ComputeLightPropagationWork() increment the EntropyIndex by 1 (rather than 234987)

2:59:04Our lighting looks broadly similar

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2:59:04Our lighting looks broadly similar

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2:59:04Our lighting looks broadly similar

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2:59:18Make FullCast() take EntopyIndex as a pointer so that it may increment it

3:00:32Our lighting looks the same

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3:00:32Our lighting looks the same

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3:00:32Our lighting looks the same

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3:00:38Add a SampleBatch loop to FullCast() to perform the GridRayCast() code eight times

3:01:15Our lighting works, but is not as smooth as hoped

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3:01:15Our lighting works, but is not as smooth as hoped

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3:01:15Our lighting works, but is not as smooth as hoped

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3:01:43Increase the SampleBatch loop from 8 to 16 in FullCast()

3:01:56Our lighting remains flickery

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3:01:56Our lighting remains flickery

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3:01:56Our lighting remains flickery

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3:02:27Rethink how casting more rays may affect the smoothing

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3:02:27Rethink how casting more rays may affect the smoothing

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3:02:27Rethink how casting more rays may affect the smoothing

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3:03:14Check out our lighting flicker

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3:03:14Check out our lighting flicker

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3:03:14Check out our lighting flicker

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3:04:20Remove the SampleBatch loop from FullCast()

3:04:34Add a SampleBatch loop to ComputeLightPropagationWork() to perform the FullCast() code sixteen times

3:05:17Our lighting remains flickery

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3:05:17Our lighting remains flickery

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3:05:17Our lighting remains flickery

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3:05:23Increase the SampleBatch loop from 16 to 32 in ComputeLightPropagationWork()

3:05:41Our lighting remains flickery

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3:05:41Our lighting remains flickery

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3:05:41Our lighting remains flickery

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3:05:50Decrease tUpdateBlend from 20/60 to 1/60 in UpdateLighting()

3:06:05We see other lighting issues

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3:06:05We see other lighting issues

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3:06:05We see other lighting issues

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3:06:25Move the SampleBatch loop from ComputeLightPropagationWork() in to FullCast()

3:06:58Our performance is great, just with other lighting bugs to fix

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3:06:58Our performance is great, just with other lighting bugs to fix

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3:06:58Our performance is great, just with other lighting bugs to fix

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3:07:43Plan to meticulously remove Z from the lighting

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3:07:43Plan to meticulously remove Z from the lighting

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3:07:43Plan to meticulously remove Z from the lighting

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3:10:17Consider lighting to be good enough, once debugged

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3:10:17Consider lighting to be good enough, once debugged

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3:10:17Consider lighting to be good enough, once debugged

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3:10:56Decrease the SampleBatch loop from 32 to 16 in FullCast()

3:11:12~20ms per frame, and ~84% frame time on ComputeLightPropagationWork

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3:11:12~20ms per frame, and ~84% frame time on ComputeLightPropagationWork

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3:11:12~20ms per frame, and ~84% frame time on ComputeLightPropagationWork

🏃

3:11:42That's good enough for today, planning next time to clean up the spatial partition and intersect rays properly

🗩

3:11:42That's good enough for today, planning next time to clean up the spatial partition and intersect rays properly

🗩

3:11:42That's good enough for today, planning next time to clean up the spatial partition and intersect rays properly

🗩

3:13:01technicbeam Soon = before next Sunday?

🗪

3:13:01technicbeam Soon = before next Sunday?

🗪

3:13:01technicbeam Soon = before next Sunday?

🗪

3:13:07Thanks, everybody

🗩

3:13:07Thanks, everybody

🗩

3:13:07Thanks, everybody

🗩

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