Sampling Light Voxels with a Reflection Vector — Handmade Hero — Episode Guide

0:01Recap and set the stage for the day

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0:01Recap and set the stage for the day

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0:01Recap and set the stage for the day

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0:34Demo our tartan world with a view to sampling all of our voxels

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0:34Demo our tartan world with a view to sampling all of our voxels

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0:34Demo our tartan world with a view to sampling all of our voxels

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2:19Consider optimising CompileZBiasProgram() to only sample from three voxels

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2:19Consider optimising CompileZBiasProgram() to only sample from three voxels

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2:19Consider optimising CompileZBiasProgram() to only sample from three voxels

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3:36Toggle off BuildSpatialPartitionForLighting() and ComputeLightPropagation() in EndLightingComputation()

4:08Nsight rendering time: 22ms / frame

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4:08Nsight rendering time: 22ms / frame

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4:08Nsight rendering time: 22ms / frame

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5:00Capture a frame to see that the glTexSubImage3D() call takes most of our frame time, at 15.13ms

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5:00Capture a frame to see that the glTexSubImage3D() call takes most of our frame time, at 15.13ms

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5:00Capture a frame to see that the glTexSubImage3D() call takes most of our frame time, at 15.13ms

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8:43Make OpenGLInit() rather than OpenGLEndFrame() set the texture parameters for each voxel

9:39Ensure that that has done nothing adverse

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9:39Ensure that that has done nothing adverse

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9:39Ensure that that has done nothing adverse

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9:58Temporarily make OpenGLEndFrame() only submit the light probe textures ten times

10:57Nsight rendering time: 8ms / frame

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10:57Nsight rendering time: 8ms / frame

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10:57Nsight rendering time: 8ms / frame

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12:04A few words on structured art, credited to Mike Biddlecombe

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12:04A few words on structured art, credited to Mike Biddlecombe

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12:04A few words on structured art, credited to Mike Biddlecombe

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13:32Make EndLightingComputation() stuff structured art into all faces of our light probe voxels, with Green in the East

15:56See our red-striped world

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15:56See our red-striped world

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15:56See our red-striped world

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16:38Enable CompileZBiasProgram() apply the colour of our East faces

18:01Demo RemedyBG's new .str feature

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18:01Demo RemedyBG's new .str feature

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18:01Demo RemedyBG's new .str feature

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19:47Fix our typo in CompileZBiasProgram()

19:58See our red- and green-striped world

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19:58See our red- and green-striped world

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19:58See our red- and green-striped world

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20:13Make EndLightingComputation() stuff structured art into the South, North, Down and Up faces of our light probe voxels

22:17See that our green striping is not as expected

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22:17See that our green striping is not as expected

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22:17See that our green striping is not as expected

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22:39Make EndLightingComputation() increase the spacing of our stripes

24:27See our distantly-spaced stripes

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24:27See our distantly-spaced stripes

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24:27See our distantly-spaced stripes

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24:41Enable our closer-spaced stripes in EndLightingComputation()

24:48See our closer-spaced stripes

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24:48See our closer-spaced stripes

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24:48See our closer-spaced stripes

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25:08Nsight rendering time: 18ms / frame

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25:08Nsight rendering time: 18ms / frame

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25:08Nsight rendering time: 18ms / frame

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25:29Capture a frame to determine that we must be CPU-bound

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25:29Capture a frame to determine that we must be CPU-bound

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25:29Capture a frame to determine that we must be CPU-bound

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26:10Toggle off the structured art code in EndLightingComputation()

26:21Nsight rendering time: 6 to 14ms / frame

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26:21Nsight rendering time: 6 to 14ms / frame

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26:21Nsight rendering time: 6 to 14ms / frame

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27:22Check our GPU model: NVIDIA GeForce GTX 1080

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27:22Check our GPU model: NVIDIA GeForce GTX 1080

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27:22Check our GPU model: NVIDIA GeForce GTX 1080

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27:51Consider how best to fill our pixels, not using GPU Voxelisation because of its unordered access view

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27:51Consider how best to fill our pixels, not using GPU Voxelisation because of its unordered access view

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27:51Consider how best to fill our pixels, not using GPU Voxelisation because of its unordered access view

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35:24Disable voxel blending in OpenGLInit(), so we can see their boundaries

36:15Gauge the width of our voxels

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36:15Gauge the width of our voxels

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36:15Gauge the width of our voxels

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37:00Make UpdateAndRenderWorld() set the WorldCameraRect based on the ExpectedFocus

39:59See that our entire viewable region is fully lit

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39:59See that our entire viewable region is fully lit

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39:59See that our entire viewable region is fully lit

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41:07Consider our voxel grid to be too detailed

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41:07Consider our voxel grid to be too detailed

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41:07Consider our voxel grid to be too detailed

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41:35Reduce our LIGHT_LOOKUP_VOXEL_DIM from 128 to 64

41:59Consider our voxel grid to be more reasonably detailed

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41:59Consider our voxel grid to be more reasonably detailed

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41:59Consider our voxel grid to be more reasonably detailed

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42:16Reduce our LIGHT_LOOKUP_VOXEL_DIM from 64 to 32

42:28Consider our voxel grid to be roughly the right size, but the Y-band to be too thick

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42:28Consider our voxel grid to be roughly the right size, but the Y-band to be too thick

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42:28Consider our voxel grid to be roughly the right size, but the Y-band to be too thick

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44:07Scan through CompileZBiasProgram() and EndLightingComputation() for possible bugs

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44:07Scan through CompileZBiasProgram() and EndLightingComputation() for possible bugs

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44:07Scan through CompileZBiasProgram() and EndLightingComputation() for possible bugs

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46:48See eight narrow stripes along the X axis

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46:48See eight narrow stripes along the X axis

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46:48See eight narrow stripes along the X axis

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47:06Understanding modulo operation

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47:06Understanding modulo operation

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47:06Understanding modulo operation

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47:43Toggle off the extraneous stripes EndLightingComputation()

47:56See four red stripes along X

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47:56See four red stripes along X

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47:56See four red stripes along X

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48:47Try to apply Green to the LightWest in EndLightingComputation()

49:26See no difference, to determine that our problem is in the filling / sampling of all faces of the voxels

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49:26See no difference, to determine that our problem is in the filling / sampling of all faces of the voxels

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49:26See no difference, to determine that our problem is in the filling / sampling of all faces of the voxels

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49:47Disable the LightBounds resizing and positioning code in UpdateAndRenderWorld()

51:46Traverse the world with the determination to work on our spatial query

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51:46Traverse the world with the determination to work on our spatial query

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51:46Traverse the world with the determination to work on our spatial query

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52:37Scan the code for any problems in our voxel specifications

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52:37Scan the code for any problems in our voxel specifications

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52:37Scan the code for any problems in our voxel specifications

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53:53See no green stripes in Y, step in to UpdateAndRenderWorld() and inspect our InvLightDim

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53:53See no green stripes in Y, step in to UpdateAndRenderWorld() and inspect our InvLightDim

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53:53See no green stripes in Y, step in to UpdateAndRenderWorld() and inspect our InvLightDim

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56:11Break in to a voxel submission in OpenGLEndFrame() and inspect the LightData

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56:11Break in to a voxel submission in OpenGLEndFrame() and inspect the LightData

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56:11Break in to a voxel submission in OpenGLEndFrame() and inspect the LightData

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59:41Scrutinise our test striping code in EndLightingComputation(), and the voxel initialisation code in OpenGLBeginFrame()

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59:41Scrutinise our test striping code in EndLightingComputation(), and the voxel initialisation code in OpenGLBeginFrame()

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59:41Scrutinise our test striping code in EndLightingComputation(), and the voxel initialisation code in OpenGLBeginFrame()

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1:02:46Excise stale OpenGL light values, and size the LightData in open_gl by the LIGHT_LOOKUP_VOXEL_DIM

1:05:13See our expected green stripes in Y

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1:05:13See our expected green stripes in Y

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1:05:13See our expected green stripes in Y

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1:05:32Make EndLightingComputation() colour our lighting bounds

1:06:30See our four stripes in X and Y

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1:06:30See our four stripes in X and Y

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1:06:30See our four stripes in X and Y

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1:07:21Consider using non-uniform voxel bounds, e.g. 64 × 64 × 32

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1:07:21Consider using non-uniform voxel bounds, e.g. 64 × 64 × 32

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1:07:21Consider using non-uniform voxel bounds, e.g. 64 × 64 × 32

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1:09:05Make UpdateAndRenderWorld() form a square LightBounds

1:10:18See our square light bounds

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1:10:18See our square light bounds

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1:10:18See our square light bounds

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1:11:06Make EndLightingComputation() stripe every other voxel

1:11:32See that our light probes tend to span two voxels

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1:11:32See that our light probes tend to span two voxels

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1:11:32See that our light probes tend to span two voxels

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1:12:43Decrease the LIGHT_LOOKUP_VOXEL_DIM from 32 to 16

1:12:55See that we have roughly one voxel per light probe

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1:12:55See that we have roughly one voxel per light probe

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1:12:55See that we have roughly one voxel per light probe

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1:14:18Increase the LIGHT_LOOKUP_VOXEL_DIM from 16 to 32

1:14:36Determine to light our world

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1:14:36Determine to light our world

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1:14:36Determine to light our world

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1:14:45Nuke our striped lighting, and stuff the West face of all voxels with white

1:15:42See our uniformly lit world

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1:15:42See our uniformly lit world

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1:15:42See our uniformly lit world

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1:16:05Consider our lighting equation

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1:16:05Consider our lighting equation

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1:16:05Consider our lighting equation

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1:20:57Simple Fragment Lighting

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1:20:57Simple Fragment Lighting

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1:20:57Simple Fragment Lighting

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1:25:59Reflection Vector

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1:25:59Reflection Vector

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1:25:59Reflection Vector

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1:28:52HOWTO search "reflection" in the episode guide¹

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1:28:52HOWTO search "reflection" in the episode guide¹

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1:28:52HOWTO search "reflection" in the episode guide¹

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1:29:19Compute our reflection vector in CompileZBiasProgram()²

1:32:36Run successfully

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1:32:36Run successfully

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1:32:36Run successfully

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1:32:38Make CompileZBiasProgram() sample the lighting specularly from the direction of the reflection vector, introducing GetIrradiance()

1:37:31See our west-lit world

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1:37:31See our west-lit world

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1:37:31See our west-lit world

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1:37:46Check our lighting equation in CompileZBiasProgram()

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1:37:46Check our lighting equation in CompileZBiasProgram()

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1:37:46Check our lighting equation in CompileZBiasProgram()

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1:39:30Consider our lighting to be exactly right, except for the falloff

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1:39:30Consider our lighting to be exactly right, except for the falloff

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1:39:30Consider our lighting to be exactly right, except for the falloff

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1:40:58Try making EndLightingComputation() light from the East

1:41:22See our east-lit world

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1:41:22See our east-lit world

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1:41:22See our east-lit world

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1:41:44Note that we're computing the lighting based on the debug camera

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1:41:44Note that we're computing the lighting based on the debug camera

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1:41:44Note that we're computing the lighting based on the debug camera

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1:42:29Try making EndLightingComputation() light from the South

1:42:49See our south-lit world, and wonder if the reflection is wrong

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1:42:49See our south-lit world, and wonder if the reflection is wrong

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1:42:49See our south-lit world, and wonder if the reflection is wrong

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1:44:07Scrutinise our lighting normals in CompileZBiasProgram()

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1:44:07Scrutinise our lighting normals in CompileZBiasProgram()

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1:44:07Scrutinise our lighting normals in CompileZBiasProgram()

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1:46:06Note that our sprite normals are probably wrong

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1:46:06Note that our sprite normals are probably wrong

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1:46:06Note that our sprite normals are probably wrong

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1:47:14Try making EndLightingComputation() light from the North

1:47:32See our north-lit world

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1:47:32See our north-lit world

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1:47:32See our north-lit world

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1:47:40Try making EndLightingComputation() light from Below

1:47:55See our below-lit world

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1:47:55See our below-lit world

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1:47:55See our below-lit world

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1:48:04Try making EndLightingComputation() light from Above

1:48:14See our above-lit world

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1:48:14See our above-lit world

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1:48:14See our above-lit world

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1:48:27Make EndLightingComputation() light purple from above and yellow from below

1:49:05See our colourfully-lit world

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1:49:05See our colourfully-lit world

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1:49:05See our colourfully-lit world

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1:50:13Q&A

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1:50:13Q&A

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1:50:13Q&A

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1:50:47somebody_took_my_name Q: Shouldn't it be R = I + 2*…, adding instead of subtracting the vectors?

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1:50:47somebody_took_my_name Q: Shouldn't it be R = I + 2*…, adding instead of subtracting the vectors?

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1:50:47somebody_took_my_name Q: Shouldn't it be R = I + 2*…, adding instead of subtracting the vectors?

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1:51:42Flip the reflection vector computation in CompileZBiasProgram()

1:52:10See our (in)correctly lit world

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1:52:10See our (in)correctly lit world

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1:52:10See our (in)correctly lit world

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1:53:52xxthebigfoxx Q: I think subtraction is right, actually, isn't it?

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1:53:52xxthebigfoxx Q: I think subtraction is right, actually, isn't it?

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1:53:52xxthebigfoxx Q: I think subtraction is right, actually, isn't it?

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1:54:01Reflection Vector Direction

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1:54:01Reflection Vector Direction

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1:54:01Reflection Vector Direction

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1:56:27Flip back the reflection vector computation in CompileZBiasProgram()

1:56:42Reflection Vector Direction, continued

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1:56:42Reflection Vector Direction, continued

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1:56:42Reflection Vector Direction, continued

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1:58:09See our purple sky reflection

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1:58:09See our purple sky reflection

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1:58:09See our purple sky reflection

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1:58:37vaualbus Q: So where would you put material information for the lighting? In the ray tracing part of the algorithm, that we still have not plugged in, or in the shader?

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1:58:37vaualbus Q: So where would you put material information for the lighting? In the ray tracing part of the algorithm, that we still have not plugged in, or in the shader?

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1:58:37vaualbus Q: So where would you put material information for the lighting? In the ray tracing part of the algorithm, that we still have not plugged in, or in the shader?

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2:03:30xxthebigfoxx Q: Are the AVX load instructions actually fast? Have you tested them?

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2:03:30xxthebigfoxx Q: Are the AVX load instructions actually fast? Have you tested them?

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2:03:30xxthebigfoxx Q: Are the AVX load instructions actually fast? Have you tested them?

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2:04:31vaualbus Q: Like this photo?³

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2:04:31vaualbus Q: Like this photo?³

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2:04:31vaualbus Q: Like this photo?³

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2:06:16vaualbus Q: Were the PS3's SPUs good at texture sampling?

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2:06:16vaualbus Q: Were the PS3's SPUs good at texture sampling?

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2:06:16vaualbus Q: Were the PS3's SPUs good at texture sampling?

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2:09:41Wrap it up

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2:09:41Wrap it up

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2:09:41Wrap it up

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