Raycasting from Light Probe Locations — Handmade Hero — Episode Guide

0:02Recap and set the stage for the day

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0:02Recap and set the stage for the day

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0:02Recap and set the stage for the day

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0:44Demo the current state of our test ray casting from voxel centres, with the determination to cast rays from light probe locations

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0:44Demo the current state of our test ray casting from voxel centres, with the determination to cast rays from light probe locations

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0:44Demo the current state of our test ray casting from voxel centres, with the determination to cast rays from light probe locations

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4:28Prepare to switch over to raycasting from light probe locations

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4:28Prepare to switch over to raycasting from light probe locations

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4:28Prepare to switch over to raycasting from light probe locations

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7:32Introduce Frumbledygok() to contain the voxel-centre casting code from EndLightingComputation()

8:47Begin to develop the light probe-based ray casting

11:33A few words on programmable light falloff vs real life inverse-square falloff

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11:33A few words on programmable light falloff vs real life inverse-square falloff

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11:33A few words on programmable light falloff vs real life inverse-square falloff

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14:07Continue to develop the light probe-based ray casting, introducing TestCastFromProbes()

20:58Introduce GetVoxelIndex() to find which voxel a point in world space corresponds to

25:38Introduce GetVoxelCenterP()

27:34Make TestCastFromProbes() call our new GetVoxelIndex() and GetVoxelCenterP()

29:28Check out our initial light probe-based ray cast lighting

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29:28Check out our initial light probe-based ray cast lighting

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29:28Check out our initial light probe-based ray cast lighting

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30:46Toggle on IsTestCast in TestCastFromProbes()

31:37See unexpected rays

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31:37See unexpected rays

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31:37See unexpected rays

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32:16Disable lighting in CompileZBiasProgram()

32:28Check out our rays in a shadowless world

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32:28Check out our rays in a shadowless world

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32:28Check out our rays in a shadowless world

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33:00Fix the HitP computation in TestCastFromProbes()

33:36Check out our correct rays in a shadowless world

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33:36Check out our correct rays in a shadowless world

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33:36Check out our correct rays in a shadowless world

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34:44Consider working on our voxel fill

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34:44Consider working on our voxel fill

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34:44Consider working on our voxel fill

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36:50Introduce PushDebugBox() for RayCast() to call

39:00Make TestCastFromProbes() draw the voxels hit by the rays

41:38Check out our hit voxels, finding that we seem to overflow our DebugLines in lighting_solution

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41:38Check out our hit voxels, finding that we seem to overflow our DebugLines in lighting_solution

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41:38Check out our hit voxels, finding that we seem to overflow our DebugLines in lighting_solution

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43:19The puss arrives

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43:19The puss arrives

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43:19The puss arrives

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43:59Hit our assertion in PushDebugLine() and investigate why

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43:59Hit our assertion in PushDebugLine() and investigate why

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43:59Hit our assertion in PushDebugLine() and investigate why

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45:39Increase the DebugLines array in lighting_solution from 4096 to 65536

46:04Check out our supposed 4096 lines

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46:04Check out our supposed 4096 lines

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46:04Check out our supposed 4096 lines

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47:14Step through TestCastFromProbes() to see multiple light probes set identically

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47:14Step through TestCastFromProbes() to see multiple light probes set identically

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47:14Step through TestCastFromProbes() to see multiple light probes set identically

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48:45Replace the SetLightProbePosition() call in UpdateAndRenderEntities() with a newly introduced PushLightProbe(), to prevent multiple light probes in the same location

51:06Check out our hit voxels

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51:06Check out our hit voxels

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51:06Check out our hit voxels

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52:26Shrink the voxel debug visualisation in TestCastFromProbes()

53:01Check out our hit voxels, and determine to fill a swathe of nine voxels

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53:01Check out our hit voxels, and determine to fill a swathe of nine voxels

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53:01Check out our hit voxels, and determine to fill a swathe of nine voxels

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54:35Molly Meow

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54:35Molly Meow

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54:35Molly Meow

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56:41Introduce SpamVoxel() to flood our light computation into blocks of nine voxels, and a utility InLargeVoxel()

1:03:17Check out our flood filled voxels

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1:03:17Check out our flood filled voxels

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1:03:17Check out our flood filled voxels

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1:03:37Prevent CompileZBiasProgram() from disabling the lighting

1:04:05Check out our beautiful lighting

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1:04:05Check out our beautiful lighting

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1:04:05Check out our beautiful lighting

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1:04:52Make UpdateAndRenderEntities() position our light source nearer the ground

1:05:20Find that our light source still lights the area beyond a wall

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1:05:20Find that our light source still lights the area beyond a wall

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1:05:20Find that our light source still lights the area beyond a wall

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1:05:55Disable lighting in CompileZBiasProgram()

1:06:11Note that our flood filling does not propagate through the wall at the starting location

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1:06:11Note that our flood filling does not propagate through the wall at the starting location

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1:06:11Note that our flood filling does not propagate through the wall at the starting location

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1:06:49Prevent CompileZBiasProgram() from disabling the lighting

1:07:14Increase the radius of our test casting debug visualisation in TestCastFromProbes()

1:08:02See our flood filling propagate through that wall at the starting location

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1:08:02See our flood filling propagate through that wall at the starting location

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1:08:02See our flood filling propagate through that wall at the starting location

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1:08:14Only make TestCastFromProbes() perform the flood fill if our ray did not hit

1:08:36Find that we light slightly erroneously, because we aren't clearing voxels

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1:08:36Find that we light slightly erroneously, because we aren't clearing voxels

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1:08:36Find that we light slightly erroneously, because we aren't clearing voxels

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1:09:24Decrease the radius of our test casting debug visualisation in TestCastFromProbes()

1:09:45Make TestCastFromProbes() clear the voxels each frame

1:11:02Check out our lighting

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1:11:02Check out our lighting

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1:11:02Check out our lighting

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1:11:45Make UpdateAndRenderEntities() position our light source still nearer the ground

1:12:33Admire our fog-of-war lighting

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1:12:33Admire our fog-of-war lighting

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1:12:33Admire our fog-of-war lighting

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1:12:49Decrease the light falloff time (thus increasing our light radius) in SpamVoxel()

1:13:12Admire our more farsighted fog-of-war lighting

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1:13:12Admire our more farsighted fog-of-war lighting

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1:13:12Admire our more farsighted fog-of-war lighting

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1:13:41Disable IsTestCast in TestCastFromProbes()

1:14:05Admire our fog-of-war lighting without voxel debug visualisation

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1:14:05Admire our fog-of-war lighting without voxel debug visualisation

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1:14:05Admire our fog-of-war lighting without voxel debug visualisation

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1:15:04Make UpdateAndRenderWorld() position the light source relative to GroundP

1:15:34Admire our more stable light, with the determination to handle blending and convection

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1:15:34Admire our more stable light, with the determination to handle blending and convection

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1:15:34Admire our more stable light, with the determination to handle blending and convection

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1:18:15Q&A

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1:18:15Q&A

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1:18:15Q&A

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1:19:22sahfortv Q: Isn't there an hour left?

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1:19:22sahfortv Q: Isn't there an hour left?

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1:19:22sahfortv Q: Isn't there an hour left?

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1:19:53sneakybob_wot Q: would the particle system you had (heads popping out) be affected by the shadows at the moment?

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1:19:53sneakybob_wot Q: would the particle system you had (heads popping out) be affected by the shadows at the moment?

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1:19:53sneakybob_wot Q: would the particle system you had (heads popping out) be affected by the shadows at the moment?

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1:20:09Check out the lighting on the particles

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1:20:09Check out the lighting on the particles

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1:20:09Check out the lighting on the particles

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1:22:17Disable Global_Lighting_ShowProbes

1:22:25Check out our cleanly lit world

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1:22:25Check out our cleanly lit world

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1:22:25Check out our cleanly lit world

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1:23:44vaualbus Q: Can we enable light for the debug interface so we see the impact of the code?

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1:23:44vaualbus Q: Can we enable light for the debug interface so we see the impact of the code?

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1:23:44vaualbus Q: Can we enable light for the debug interface so we see the impact of the code?

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1:24:10tootac Q: Are you procrastinating on doing gameplay code and inventing problems to solve? Last time I checked (~3 months ago) you were saying you are about to start gameplay code in a couple of streams

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1:24:10tootac Q: Are you procrastinating on doing gameplay code and inventing problems to solve? Last time I checked (~3 months ago) you were saying you are about to start gameplay code in a couple of streams

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1:24:10tootac Q: Are you procrastinating on doing gameplay code and inventing problems to solve? Last time I checked (~3 months ago) you were saying you are about to start gameplay code in a couple of streams

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1:24:56Admire our lighting

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1:24:56Admire our lighting

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1:24:56Admire our lighting

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1:25:39polijn Just give the game code as an assignment to Jon. Last I heard he had time to spare

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1:25:39polijn Just give the game code as an assignment to Jon. Last I heard he had time to spare

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1:25:39polijn Just give the game code as an assignment to Jon. Last I heard he had time to spare

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1:25:54ankut Q: Why are the debug lines a fixed sized buffer? Just 'cause it's throwaway code?

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1:25:54ankut Q: Why are the debug lines a fixed sized buffer? Just 'cause it's throwaway code?

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1:25:54ankut Q: Why are the debug lines a fixed sized buffer? Just 'cause it's throwaway code?

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1:26:43dithinas Q: Do you have any thoughts on the trade-offs of making your data structures directly serializable versus having intermediate serialize / deserialize steps, i.e. data structures containing pointers being converted to offsets or indices

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1:26:43dithinas Q: Do you have any thoughts on the trade-offs of making your data structures directly serializable versus having intermediate serialize / deserialize steps, i.e. data structures containing pointers being converted to offsets or indices

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1:26:43dithinas Q: Do you have any thoughts on the trade-offs of making your data structures directly serializable versus having intermediate serialize / deserialize steps, i.e. data structures containing pointers being converted to offsets or indices

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1:28:170lpbm Q: Are the bounces going to be computed also with the raytracer?

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1:28:170lpbm Q: Are the bounces going to be computed also with the raytracer?

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1:28:170lpbm Q: Are the bounces going to be computed also with the raytracer?

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1:29:19Increase tCloseEnough in RayCast()

1:29:42Determine the tCloseEnough filtering to be garbage

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1:29:42Determine the tCloseEnough filtering to be garbage

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1:29:42Determine the tCloseEnough filtering to be garbage

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1:30:33vaualbus Q: Can we add for a test a second bounce or it require more work?

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1:30:33vaualbus Q: Can we add for a test a second bounce or it require more work?

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1:30:33vaualbus Q: Can we add for a test a second bounce or it require more work?

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1:31:18Temporarily make TestCastFromProbes() bounce our rays once

1:34:50Check out our hacked secondary bouncing of the ray cast lighting

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1:34:50Check out our hacked secondary bouncing of the ray cast lighting

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1:34:50Check out our hacked secondary bouncing of the ray cast lighting

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1:36:16Delete the secondary bounce code from TestCastFromProbes()

1:36:43Check we didn't screw anything up there

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1:36:43Check we didn't screw anything up there

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1:36:43Check we didn't screw anything up there

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1:37:04stevenlr Q: Do you plan on adding details on how sprites are lit? Right now they are full dark when the light is behind it. Maybe normal maps or some subsurface transport? Although I guess bounces will help with that anyway

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1:37:04stevenlr Q: Do you plan on adding details on how sprites are lit? Right now they are full dark when the light is behind it. Maybe normal maps or some subsurface transport? Although I guess bounces will help with that anyway

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1:37:04stevenlr Q: Do you plan on adding details on how sprites are lit? Right now they are full dark when the light is behind it. Maybe normal maps or some subsurface transport? Although I guess bounces will help with that anyway

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1:37:45qiaoster Q: It's my second year programming and it feels like there's endless stuff to catch up before I can be a competent games programmer. What might I do to help with that?

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1:37:45qiaoster Q: It's my second year programming and it feels like there's endless stuff to catch up before I can be a competent games programmer. What might I do to help with that?

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1:37:45qiaoster Q: It's my second year programming and it feels like there's endless stuff to catch up before I can be a competent games programmer. What might I do to help with that?

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1:39:12vaualbus Q: It should be SecCast not Cast?

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1:39:12vaualbus Q: It should be SecCast not Cast?

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1:39:12vaualbus Q: It should be SecCast not Cast?

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1:39:21Reintroduce and fix the secondary bounce code in TestCastFromProbes()

1:39:45Check out our hacked secondary bouncing of the ray cast lighting

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1:39:45Check out our hacked secondary bouncing of the ray cast lighting

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1:39:45Check out our hacked secondary bouncing of the ray cast lighting

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1:41:01Make SpamVoxel() take the LightP and LightC for secondary bounces to compute specially, dimming the light

1:43:42Check out our dimmed secondary bouncing of the ray cast lighting

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1:43:42Check out our dimmed secondary bouncing of the ray cast lighting

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1:43:42Check out our dimmed secondary bouncing of the ray cast lighting

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1:44:41nickito97 Q: How are you going to handle bouncing off of different materials?

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1:44:41nickito97 Q: How are you going to handle bouncing off of different materials?

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1:44:41nickito97 Q: How are you going to handle bouncing off of different materials?

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1:45:29timetravel1 Q: Which type of engine programming do you think the industry needs the most? Does it need more graphics programmers, or physics, or sound programmers for example?

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1:45:29timetravel1 Q: Which type of engine programming do you think the industry needs the most? Does it need more graphics programmers, or physics, or sound programmers for example?

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1:45:29timetravel1 Q: Which type of engine programming do you think the industry needs the most? Does it need more graphics programmers, or physics, or sound programmers for example?

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1:47:43timetravel1 So the answer is "everything everywhere yes"

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1:47:43timetravel1 So the answer is "everything everywhere yes"

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1:47:43timetravel1 So the answer is "everything everywhere yes"

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1:48:22iof_bastion Q: Are engine programmers really as in-demand as you say? I see that most AAA games are releasing with hundreds of employees but only like 4–6 engine programmers

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1:48:22iof_bastion Q: Are engine programmers really as in-demand as you say? I see that most AAA games are releasing with hundreds of employees but only like 4–6 engine programmers

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1:48:22iof_bastion Q: Are engine programmers really as in-demand as you say? I see that most AAA games are releasing with hundreds of employees but only like 4–6 engine programmers

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1:49:58qiaoster Q: How much do game studios hire interns? Trying to find something for next year

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1:49:58qiaoster Q: How much do game studios hire interns? Trying to find something for next year

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1:49:58qiaoster Q: How much do game studios hire interns? Trying to find something for next year

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1:50:44binarytoshokan Q: Following with the theme, what would you define as the minimum requirements to be a good engine programmer?

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1:50:44binarytoshokan Q: Following with the theme, what would you define as the minimum requirements to be a good engine programmer?

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1:50:44binarytoshokan Q: Following with the theme, what would you define as the minimum requirements to be a good engine programmer?

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1:53:57an0nymal Q: Why aren't most studios willing to compensate appropriately in spite of the seemingly short supply of graphics programmers?

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1:53:57an0nymal Q: Why aren't most studios willing to compensate appropriately in spite of the seemingly short supply of graphics programmers?

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1:53:57an0nymal Q: Why aren't most studios willing to compensate appropriately in spite of the seemingly short supply of graphics programmers?

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1:54:57centhusiast Q: Have you heard about Valve's ACO Mesa shader compiler for AMD GPU? Apparently it is replacing LLVM and it is a great thing for Linux gaming

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1:54:57centhusiast Q: Have you heard about Valve's ACO Mesa shader compiler for AMD GPU? Apparently it is replacing LLVM and it is a great thing for Linux gaming

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1:54:57centhusiast Q: Have you heard about Valve's ACO Mesa shader compiler for AMD GPU? Apparently it is replacing LLVM and it is a great thing for Linux gaming

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1:55:24an0nymal Q: Relative to other positions on the team that may not require as extensive knowledge

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1:55:24an0nymal Q: Relative to other positions on the team that may not require as extensive knowledge

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1:55:24an0nymal Q: Relative to other positions on the team that may not require as extensive knowledge

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1:57:23centhusiast Q: Have you heard about Valve's ACO Mesa shader compiler for AMD GPU? Apparently it is replacing LLVM and it is a great thing for Linux gaming

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1:57:23centhusiast Q: Have you heard about Valve's ACO Mesa shader compiler for AMD GPU? Apparently it is replacing LLVM and it is a great thing for Linux gaming

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1:57:23centhusiast Q: Have you heard about Valve's ACO Mesa shader compiler for AMD GPU? Apparently it is replacing LLVM and it is a great thing for Linux gaming

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1:58:17an0nymal Q: Well, as a specific example, take Bethesda: They pay gameplay programmers 80–110k, but the graphics / engine programmer is 90–130k. Obviously, those numbers are from pay scale, glass door, etc, but most likely represent a decent sample size

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1:58:17an0nymal Q: Well, as a specific example, take Bethesda: They pay gameplay programmers 80–110k, but the graphics / engine programmer is 90–130k. Obviously, those numbers are from pay scale, glass door, etc, but most likely represent a decent sample size

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1:58:17an0nymal Q: Well, as a specific example, take Bethesda: They pay gameplay programmers 80–110k, but the graphics / engine programmer is 90–130k. Obviously, those numbers are from pay scale, glass door, etc, but most likely represent a decent sample size

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2:01:28Wrap it up

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2:01:28Wrap it up

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2:01:28Wrap it up

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