Debugging Simplified Lighting — Handmade Hero — Episode Guide

0:00Recap and set the stage for the day

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0:00Recap and set the stage for the day

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0:00Recap and set the stage for the day

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3:14Demo the lighting performance

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3:14Demo the lighting performance

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3:14Demo the lighting performance

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4:19Describe the old eight-ray octahedral lighting

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4:19Describe the old eight-ray octahedral lighting

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4:19Describe the old eight-ray octahedral lighting

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7:06Increase the SampleBatch loop from 16 to 64 in FullCast()

7:22Our performance has degraded

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7:22Our performance has degraded

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7:22Our performance has degraded

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7:28Decrease the SampleBatch loop from 64 to 8 in FullCast()

7:36We could easily hit 60 FPS

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7:36We could easily hit 60 FPS

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7:36We could easily hit 60 FPS

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8:05Consider moving the SampleBatch loop down to GridRayCast()

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8:05Consider moving the SampleBatch loop down to GridRayCast()

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8:05Consider moving the SampleBatch loop down to GridRayCast()

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10:27Consider analysing the sampling distribution of FullCast()

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10:27Consider analysing the sampling distribution of FullCast()

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10:27Consider analysing the sampling distribution of FullCast()

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12:17Move the SampleBatch loop from FullCast() down to GridRayCast()

14:17Check the call stack of GridRayCast() for EntropyIndex

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14:17Check the call stack of GridRayCast() for EntropyIndex

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14:17Check the call stack of GridRayCast() for EntropyIndex

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15:16Change FullCast() to take Entropy not as a pointer, and setup ComputeLightPropagationWork() increment the Entropy

16:20Reacquaint ourselves with our random number generation

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16:20Reacquaint ourselves with our random number generation

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16:20Reacquaint ourselves with our random number generation

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20:39Make ComputeLightPropagationWork() get Entropy from RandomSeedOffset()

21:57Consider usage of our random number code, and then just casting all 16 octahedrons

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21:57Consider usage of our random number code, and then just casting all 16 octahedrons

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21:57Consider usage of our random number code, and then just casting all 16 octahedrons

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24:49Remove entropy from FullCast() and make GridRayCast() just sample all the octahedrons

31:41Reacquaint ourselves with the sample direction picking code in GridRayCast()

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31:41Reacquaint ourselves with the sample direction picking code in GridRayCast()

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31:41Reacquaint ourselves with the sample direction picking code in GridRayCast()

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36:09Fix GridRayCast() to correctly step through the lighting table

37:56Consider structuring the lighting table with Rows being prime, and Octahedrons being interior

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37:56Consider structuring the lighting table with Rows being prime, and Octahedrons being interior

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37:56Consider structuring the lighting table with Rows being prime, and Octahedrons being interior

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39:12Make GridRayCast() take an Sy value from FullCast(), for stepping through the sample table

41:36Remove Entropy from the call to FullCast() in ComputeLightPropagationWork()

42:09Our lighting is now stable

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42:09Our lighting is now stable

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42:09Our lighting is now stable

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42:27Increase tUpdateBlend from 1/60 to 15/60 in UpdateLighting()

42:56The lighting doesn't seem to line up correctly when shifting around

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42:56The lighting doesn't seem to line up correctly when shifting around

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42:56The lighting doesn't seem to line up correctly when shifting around

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44:16~28ms per frame, and ~82% frame time on ComputeLightPropagationWork

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44:16~28ms per frame, and ~82% frame time on ComputeLightPropagationWork

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44:16~28ms per frame, and ~82% frame time on ComputeLightPropagationWork

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45:45Determine to debug the lighting computation

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45:45Determine to debug the lighting computation

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45:45Determine to debug the lighting computation

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46:54Walk through GridRayCast() and ComputeWalkTable() to refresh our memories

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46:54Walk through GridRayCast() and ComputeWalkTable() to refresh our memories

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46:54Walk through GridRayCast() and ComputeWalkTable() to refresh our memories

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52:52Toggle on DebugDrawOctahedralValues() in UpdateLighting()

53:01Check out the light probes

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53:01Check out the light probes

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53:01Check out the light probes

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54:11Toggle on DebugDrawSpatialGrid() in UpdateLighting()

54:21Flood the debug system with vertices

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54:21Flood the debug system with vertices

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54:21Flood the debug system with vertices

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54:49Make UpdateLighting() double the MaxDebugLineCount

54:56Still flood the debug system with vertices

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54:56Still flood the debug system with vertices

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54:56Still flood the debug system with vertices

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55:03Make PushLightingRenderValues() batch up the debug lines into 16-bit capable chunks

58:42Still flood the debug system with vertices

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58:42Still flood the debug system with vertices

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58:42Still flood the debug system with vertices

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58:58Investigate the bug in our lighting debug line batching

1:00:24Decrease the batch size from U16Max to 4096 in PushLightingRenderValues()

1:00:45Check out our spatial grid

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1:00:45Check out our spatial grid

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1:00:45Check out our spatial grid

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1:03:05Consider restoring our lighting alignment

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1:03:05Consider restoring our lighting alignment

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1:03:05Consider restoring our lighting alignment

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1:04:57Make UpdateLighting() offset the AtlasMinCorner by half a voxel

1:07:34Admire our light poisoning

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1:07:34Admire our light poisoning

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1:07:34Admire our light poisoning

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1:09:30Comment out the AtlasMinCorner offset in UpdateLighting()

1:09:43Traverse the orphanage, pondering the offset-induced lighting poisoning

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1:09:43Traverse the orphanage, pondering the offset-induced lighting poisoning

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1:09:43Traverse the orphanage, pondering the offset-induced lighting poisoning

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1:10:23Consider why the lighting alignment affects its feedback behaviour

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1:10:23Consider why the lighting alignment affects its feedback behaviour

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1:10:23Consider why the lighting alignment affects its feedback behaviour

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1:11:28Let UpdateLighting() offset the AtlasMinCorner by half a voxel

1:11:31Take one last look at the light poisoning

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1:11:31Take one last look at the light poisoning

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1:11:31Take one last look at the light poisoning

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1:11:58Toggle off DebugDrawOctahedralValues() and DebugDrawSpatialGrid() in UpdateLighting()

1:12:14Consider it to be a sampling direction bug

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1:12:14Consider it to be a sampling direction bug

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1:12:14Consider it to be a sampling direction bug

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1:13:16Toggle on DebugDrawOctahedralValues() in UpdateLighting(), and the octahedral map drawing

1:13:40Check out our octahedral map koosh balls

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1:13:40Check out our octahedral map koosh balls

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1:13:40Check out our octahedral map koosh balls

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1:15:06Toggle on and make DebugDrawSpatialGrid() draw just the cell boundaries

1:15:35Check out the cell boundaries in relation to the octahedral map koosh balls

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1:15:35Check out the cell boundaries in relation to the octahedral map koosh balls

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1:15:35Check out the cell boundaries in relation to the octahedral map koosh balls

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1:16:10Toggle on the occluder drawing in DebugDrawSpatialGrid()

1:16:22Light probes inside light sources inconsistently see light and no light

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1:16:22Light probes inside light sources inconsistently see light and no light

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1:16:22Light probes inside light sources inconsistently see light and no light

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1:18:27lfcdi The hero's light box is sometimes red and sometimes green

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1:18:27lfcdi The hero's light box is sometimes red and sometimes green

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1:18:27lfcdi The hero's light box is sometimes red and sometimes green

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1:18:33Demo the spatial grid checkerboard colouring

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1:18:33Demo the spatial grid checkerboard colouring

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1:18:33Demo the spatial grid checkerboard colouring

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1:18:54Toggle off the non-occluder drawing in DebugDrawSpatialGrid()

1:19:04Demo the spatial grid checkerboard colouring

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1:19:04Demo the spatial grid checkerboard colouring

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1:19:04Demo the spatial grid checkerboard colouring

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1:21:11Determine to investigate the ray caster

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1:21:11Determine to investigate the ray caster

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1:21:11Determine to investigate the ray caster

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1:21:30horrowind In handmade_lighting.cpp: line 152 SampleDir = ... Should the first factor be Sy*16*8?

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1:21:30horrowind In handmade_lighting.cpp: line 152 SampleDir = ... Should the first factor be Sy*16*8?

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1:21:30horrowind In handmade_lighting.cpp: line 152 SampleDir = ... Should the first factor be Sy*16*8?

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1:22:14Explain the SampleDirectionTable indexing line in GridRayCast()

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1:22:14Explain the SampleDirectionTable indexing line in GridRayCast()

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1:22:14Explain the SampleDirectionTable indexing line in GridRayCast()

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1:24:13horrowind I was just wondering because the outer index did not seem to incorporate two factors

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1:24:13horrowind I was just wondering because the outer index did not seem to incorporate two factors

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1:24:13horrowind I was just wondering because the outer index did not seem to incorporate two factors

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1:27:48Set up to investigate the ray caster for bugs

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1:27:48Set up to investigate the ray caster for bugs

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1:27:48Set up to investigate the ray caster for bugs

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1:29:42Scour FullCast() for bugs

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1:29:42Scour FullCast() for bugs

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1:29:42Scour FullCast() for bugs

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1:31:00Make FullCast() write magenta into each SpecTexel inside geometry

1:33:35Admire our magenta light probes

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1:33:35Admire our magenta light probes

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1:33:35Admire our magenta light probes

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1:34:30Lights incorrectly fail to pick up light

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1:34:30Lights incorrectly fail to pick up light

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1:34:30Lights incorrectly fail to pick up light

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1:35:27ciansweeney Debugging lighting is the biggest pain in the ass

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1:35:27ciansweeney Debugging lighting is the biggest pain in the ass

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1:35:27ciansweeney Debugging lighting is the biggest pain in the ass

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1:35:34Optionally make FullCast() write black into each SpecTexel inside geometry

1:36:12Our "inside" light probes are now black

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1:36:12Our "inside" light probes are now black

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1:36:12Our "inside" light probes are now black

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1:36:28Toggle off DebugDrawSpatialGrid() in UpdateLighting()

1:37:01Our light probes are picking up illogical light

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1:37:01Our light probes are picking up illogical light

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1:37:01Our light probes are picking up illogical light

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1:38:26Consult the SampleDirectionTable for clues regarding our illogical light probes

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1:38:26Consult the SampleDirectionTable for clues regarding our illogical light probes

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1:38:26Consult the SampleDirectionTable for clues regarding our illogical light probes

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1:40:23gregg_ink So we got issues but that's not a problem for us because the worse they are, the faster we will fix them. Love that logic

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1:40:23gregg_ink So we got issues but that's not a problem for us because the worse they are, the faster we will fix them. Love that logic

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1:40:23gregg_ink So we got issues but that's not a problem for us because the worse they are, the faster we will fix them. Love that logic

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1:43:45Check the Remainder code in FullCast()

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1:43:45Check the Remainder code in FullCast()

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1:43:45Check the Remainder code in FullCast()

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1:47:00The light probes inside geometry are correct, but our shifting block-copy is wrong

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1:47:00The light probes inside geometry are correct, but our shifting block-copy is wrong

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1:47:00The light probes inside geometry are correct, but our shifting block-copy is wrong

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1:48:11Check that GridRayCast() and ComputeWalkTable() work in consort

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1:48:11Check that GridRayCast() and ComputeWalkTable() work in consort

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1:48:11Check that GridRayCast() and ComputeWalkTable() work in consort

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1:50:15Consider replacing the walk table with on-the-fly computation

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1:50:15Consider replacing the walk table with on-the-fly computation

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1:50:15Consider replacing the walk table with on-the-fly computation

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1:52:21Check that GridRayCast() and ComputeWalkTable() work in consort (cont.)

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1:52:21Check that GridRayCast() and ComputeWalkTable() work in consort (cont.)

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1:52:21Check that GridRayCast() and ComputeWalkTable() work in consort (cont.)

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1:57:14Determine to draw a particular ray cast

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1:57:14Determine to draw a particular ray cast

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1:57:14Determine to draw a particular ray cast

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1:58:37Reduce the LightSamplingWalkTable pointer array from 8 to 4 in lighting_solution

1:59:15The lighting looks the same

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1:59:15The lighting looks the same

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1:59:15The lighting looks the same

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1:59:32Scour GridRayCast() for bugs

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1:59:32Scour GridRayCast() for bugs

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1:59:32Scour GridRayCast() for bugs

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2:03:00Increase MaxCostPerRay from 8 to 16 in UpdateLighting()

2:03:52~38ms per frame, and ~69% frame time on ComputeLightPropagationWork

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2:03:52~38ms per frame, and ~69% frame time on ComputeLightPropagationWork

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2:03:52~38ms per frame, and ~69% frame time on ComputeLightPropagationWork

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2:04:21Toggle off DebugDrawOctahedralValues() in UpdateLighting()

2:04:27~27ms per frame, and ~81% frame time on ComputeLightPropagationWork

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2:04:27~27ms per frame, and ~81% frame time on ComputeLightPropagationWork

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2:04:27~27ms per frame, and ~81% frame time on ComputeLightPropagationWork

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2:04:51Toggle on DebugDrawOctahedralValues() and decrease MaxCostPerRay back from 16 to 8 in UpdateLighting()

2:06:41Re-enable ray drawing in GridRayCast()

2:09:04Reacquaint ourselves with RectCenterDim() and the ProbeSamplePSingle value in GridRayCast()

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2:09:04Reacquaint ourselves with RectCenterDim() and the ProbeSamplePSingle value in GridRayCast()

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2:09:04Reacquaint ourselves with RectCenterDim() and the ProbeSamplePSingle value in GridRayCast()

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2:12:17Enable GridRayCast() to use ProbeSamplePSingle and ProbeSampleNSingle for drawing

2:14:05Consider supporting picking of a particular ray

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2:14:05Consider supporting picking of a particular ray

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2:14:05Consider supporting picking of a particular ray

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2:15:51Re-enable ray cast drawing in FullCast()

2:19:12Hunt in vain for our drawn ray cast

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2:19:12Hunt in vain for our drawn ray cast

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2:19:12Hunt in vain for our drawn ray cast

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2:19:36Toggle off DebugDrawOctahedralValues() in UpdateLighting()

2:19:57Hunt in vain for our drawn ray cast

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2:19:57Hunt in vain for our drawn ray cast

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2:19:57Hunt in vain for our drawn ray cast

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2:20:12Decrease DebugGridIndex from 717 to 200 and DebugRayIndex from 531 to 0 in UpdateLighting()

2:21:27Hunt in vain for our drawn ray cast

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2:21:27Hunt in vain for our drawn ray cast

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2:21:27Hunt in vain for our drawn ray cast

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2:21:42Elevate GRID_RAY_CAST_DEBUGGING to the top of handmade_lighting.h

2:22:46Break in to FullCast() to find that we never get to our DebugGridIndex of 200

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2:22:46Break in to FullCast() to find that we never get to our DebugGridIndex of 200

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2:22:46Break in to FullCast() to find that we never get to our DebugGridIndex of 200

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2:24:41The spatial partition is half the voxel dimensions, a mere 96

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2:24:41The spatial partition is half the voxel dimensions, a mere 96

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2:24:41The spatial partition is half the voxel dimensions, a mere 96

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2:25:43Decrease DebugGridIndex from 200 to 30 in UpdateLighting()

2:26:04Break in to FullCast() and see our drawn ray cast

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2:26:04Break in to FullCast() and see our drawn ray cast

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2:26:04Break in to FullCast() and see our drawn ray cast

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2:28:03Re-enable support for debug ray picking in FullCast(), introducing debug_ray_pick

2:34:05Quick break for water and snacks

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2:34:05Quick break for water and snacks

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2:34:05Quick break for water and snacks

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2:34:34insobot Allocates 256 megs, keeps playing. Employees are encouraged to kill yourself

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2:34:34insobot Allocates 256 megs, keeps playing. Employees are encouraged to kill yourself

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2:34:34insobot Allocates 256 megs, keeps playing. Employees are encouraged to kill yourself

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2:34:52bluemelon555 Are you providing the snacks?

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2:34:52bluemelon555 Are you providing the snacks?

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2:34:52bluemelon555 Are you providing the snacks?

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2:35:03afk

2:47:31Return with water and snacks

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2:47:31Return with water and snacks

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2:47:31Return with water and snacks

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2:48:41choosetheforce I used to inhale that stuff as a kid

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2:48:41choosetheforce I used to inhale that stuff as a kid

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2:48:41choosetheforce I used to inhale that stuff as a kid

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2:48:51Resume re-enabling support for debug ray picking in FullCast()

2:53:28The magenta "expected direction" line does not go in the direction we ray cast

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2:53:28The magenta "expected direction" line does not go in the direction we ray cast

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2:53:28The magenta "expected direction" line does not go in the direction we ray cast

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2:55:12Investigate the "expected" and "ray" direction misalignment in FullCast()

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2:55:12Investigate the "expected" and "ray" direction misalignment in FullCast()

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2:55:12Investigate the "expected" and "ray" direction misalignment in FullCast()

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2:56:27Try making FullCast() add 1 to the ExpectedDirection axes to account for the apron

2:56:47The "expected" and "ray" directions remain misaligned

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2:56:47The "expected" and "ray" directions remain misaligned

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2:56:47The "expected" and "ray" directions remain misaligned

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2:56:59Investigate the "expected" and "ray" direction misalignment in FullCast() and GridRayCast()

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2:56:59Investigate the "expected" and "ray" direction misalignment in FullCast() and GridRayCast()

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2:56:59Investigate the "expected" and "ray" direction misalignment in FullCast() and GridRayCast()

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2:58:29The "expected" and "ray" lines only need to come out of the same face of the octahedron

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2:58:29The "expected" and "ray" lines only need to come out of the same face of the octahedron

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2:58:29The "expected" and "ray" lines only need to come out of the same face of the octahedron

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2:58:56Re-enable editing of the ray picking values in DEBUGInteract() and DEBUGBeginInteract()

3:03:05Try editing GridIndex in-game

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3:03:05Try editing GridIndex in-game

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3:03:05Try editing GridIndex in-game

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3:04:06Clamp the DebugTick values in FullCast()

3:06:53GridIndex 48 yields two sets of ray casting

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3:06:53GridIndex 48 yields two sets of ray casting

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3:06:53GridIndex 48 yields two sets of ray casting

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3:07:48Replace GridIndex with a v3s AtlasIndex in debug_ray_pick, for more specific ray picking

3:11:09Introduce a v3s version of Clamp()

3:12:11Make FullCast() keep the AtlasIndex in range

3:12:25Try unsuccessfully to edit AtlasIndex

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3:12:25Try unsuccessfully to edit AtlasIndex

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3:12:25Try unsuccessfully to edit AtlasIndex

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3:13:10Add s32 editing support to DEBUGInteract() and DEBUGBeginInteract()

3:13:48Try editing our AtlasIndex values

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3:13:48Try editing our AtlasIndex values

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3:13:48Try editing our AtlasIndex values

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3:14:52Add DevUI_Interaction_TickValue to edit integer values by clicking (rather than dragging)

3:17:48Decrementing by clicking works, but incrementing does not

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3:17:48Decrementing by clicking works, but incrementing does not

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3:17:48Decrementing by clicking works, but incrementing does not

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3:18:07Fix DEBUGInteract() to increment integer values by clicking

3:18:21Click-and-hold increments integer values

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3:18:21Click-and-hold increments integer values

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3:18:21Click-and-hold increments integer values

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3:18:34Make DEBUGEndInteract() rather than DEBUGInteract() handle integer editing by clicking

3:19:21Our integer editing is more sane, but still doesn't clamp

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3:19:21Our integer editing is more sane, but still doesn't clamp

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3:19:21Our integer editing is more sane, but still doesn't clamp

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3:20:47Atlas (10, 4, 1) on our octahedral map has a straight-down expected direction

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3:20:47Atlas (10, 4, 1) on our octahedral map has a straight-down expected direction

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3:20:47Atlas (10, 4, 1) on our octahedral map has a straight-down expected direction

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3:21:39Investigate our straight-down expected direction

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3:21:39Investigate our straight-down expected direction

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3:21:39Investigate our straight-down expected direction

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3:23:50gregg_ink Are light bleed and light poisoning the same thing?

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3:23:50gregg_ink Are light bleed and light poisoning the same thing?

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3:23:50gregg_ink Are light bleed and light poisoning the same thing?

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3:26:34Inspect atlas (10, 4, 1)

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3:26:34Inspect atlas (10, 4, 1)

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3:26:34Inspect atlas (10, 4, 1)

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3:27:04Initialise AtlasIndex to 10, 4, 1 UpdateLighting()

3:27:14Ray casting on AtlasIndex (10, 4, 1) fails from Octahedron 4 onwards

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3:27:14Ray casting on AtlasIndex (10, 4, 1) fails from Octahedron 4 onwards

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3:27:14Ray casting on AtlasIndex (10, 4, 1) fails from Octahedron 4 onwards

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3:27:42Investigate SampleDirectionTable and GridRayCast() for the source of our ray casting failure

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3:27:42Investigate SampleDirectionTable and GridRayCast() for the source of our ray casting failure

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3:27:42Investigate SampleDirectionTable and GridRayCast() for the source of our ray casting failure

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3:31:20Octahedron 4 to 15 remain incorrect

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3:31:20Octahedron 4 to 15 remain incorrect

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3:31:20Octahedron 4 to 15 remain incorrect

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3:32:22Check again that GridRayCast() and ComputeWalkTable() work in consort

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3:32:22Check again that GridRayCast() and ComputeWalkTable() work in consort

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3:32:22Check again that GridRayCast() and ComputeWalkTable() work in consort

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3:35:05Initialise DirOffset in GridRayCast() for easy inspection

3:35:52Step in to GridRayCast() and inspect DirOffset and RayDSingle, to find values we didn't think existed in handmade_sampling_spheres.inl

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3:35:52Step in to GridRayCast() and inspect DirOffset and RayDSingle, to find values we didn't think existed in handmade_sampling_spheres.inl

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3:35:52Step in to GridRayCast() and inspect DirOffset and RayDSingle, to find values we didn't think existed in handmade_sampling_spheres.inl

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3:40:23ono_sendai_ Is this 2D or 3D global illumination?

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3:40:23ono_sendai_ Is this 2D or 3D global illumination?

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3:40:23ono_sendai_ Is this 2D or 3D global illumination?

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3:41:55Determine to fix GenerateOctahedralLightingPattern() next time

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3:41:55Determine to fix GenerateOctahedralLightingPattern() next time

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3:41:55Determine to fix GenerateOctahedralLightingPattern() next time

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3:46:16poissonprocess Poisson distributions!

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3:46:16poissonprocess Poisson distributions!

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3:46:16poissonprocess Poisson distributions!

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3:46:25Consider keeping Poisson distribution sampling

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3:46:25Consider keeping Poisson distribution sampling

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3:46:25Consider keeping Poisson distribution sampling

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3:48:20spacenaming Will it still be mapped to the octahedral map? Because if so, couldn't we just generate the noise on there? That is a square surface, right?

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3:48:20spacenaming Will it still be mapped to the octahedral map? Because if so, couldn't we just generate the noise on there? That is a square surface, right?

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3:48:20spacenaming Will it still be mapped to the octahedral map? Because if so, couldn't we just generate the noise on there? That is a square surface, right?

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3:49:44Determine to rebuild SampleDirectionTable next time

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3:49:44Determine to rebuild SampleDirectionTable next time

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3:49:44Determine to rebuild SampleDirectionTable next time

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3:50:19Set up GridRayCast() to traverse the SampleDirectionTable in a single loop

3:52:37Call it here, with the determination to rebuild SampleDirectionTable next time

🗩

3:52:37Call it here, with the determination to rebuild SampleDirectionTable next time

🗩

3:52:37Call it here, with the determination to rebuild SampleDirectionTable next time

🗩

3:53:21Consider the possibility of smarter ways to batch up ray processing

📖

3:53:21Consider the possibility of smarter ways to batch up ray processing

📖

3:53:21Consider the possibility of smarter ways to batch up ray processing

📖

3:54:32Thank you, everyone

🗩

3:54:32Thank you, everyone

🗩

3:54:32Thank you, everyone

🗩

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