Using the Light Probe Spatial Index — 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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0:26Demo our current lighting sampling, with the trilinear blend artifacts

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0:26Demo our current lighting sampling, with the trilinear blend artifacts

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0:26Demo our current lighting sampling, with the trilinear blend artifacts

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3:07Determine to move on to light transmission

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3:07Determine to move on to light transmission

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3:07Determine to move on to light transmission

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6:01Reacquaint ourselves with BeginLightingComputation() and EndLightingComputation()

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6:01Reacquaint ourselves with BeginLightingComputation() and EndLightingComputation()

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6:01Reacquaint ourselves with BeginLightingComputation() and EndLightingComputation()

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9:02Admire our sampling sphere

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9:02Admire our sampling sphere

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9:02Admire our sampling sphere

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9:40Remove the SampleTable from EndLightingComputation() and lighting_solution

10:33Walk through the rest of EndLightingComputation()

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10:33Walk through the rest of EndLightingComputation()

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10:33Walk through the rest of EndLightingComputation()

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11:57Determine to store persistent information in the light probes

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11:57Determine to store persistent information in the light probes

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11:57Determine to store persistent information in the light probes

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13:20Determine to specify and track light sources

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13:20Determine to specify and track light sources

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13:20Determine to specify and track light sources

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14:55"Bias" in the context of rendering vs sampling

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14:55"Bias" in the context of rendering vs sampling

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14:55"Bias" in the context of rendering vs sampling

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16:59Summarise our determination regarding light probes and tracking of light sources

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16:59Summarise our determination regarding light probes and tracking of light sources

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16:59Summarise our determination regarding light probes and tracking of light sources

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17:34Prepare EndLightingComputation() to implement persistent light probes

21:00Reacquaint ourselves with the light probe data in game_render_commands and lighting_solution

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21:00Reacquaint ourselves with the light probe data in game_render_commands and lighting_solution

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21:00Reacquaint ourselves with the light probe data in game_render_commands and lighting_solution

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23:35Remove light_probe and the LightProbes buffer from lighting_solution

23:59Consider handling variable amounts of light from the six directions, by using a uniform sampling pattern, pre-multiplied based on the rays-per-face

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23:59Consider handling variable amounts of light from the six directions, by using a uniform sampling pattern, pre-multiplied based on the rays-per-face

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23:59Consider handling variable amounts of light from the six directions, by using a uniform sampling pattern, pre-multiplied based on the rays-per-face

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26:59Make EndLightingComputation() accumulate light persistently across frames

35:26Probe Accumulation

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35:26Probe Accumulation

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35:26Probe Accumulation

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39:58Make EndLightingComputation() blend the accumulated light using our equation, rather than pre-multiplying in a first pass

44:28Prepare to voxelise our light probes

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44:28Prepare to voxelise our light probes

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44:28Prepare to voxelise our light probes

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45:39Consider the performance of our voxel sampling and trilinear blending

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45:39Consider the performance of our voxel sampling and trilinear blending

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45:39Consider the performance of our voxel sampling and trilinear blending

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46:34Determine to use our voxel spatial indexing for now

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46:34Determine to use our voxel spatial indexing for now

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46:34Determine to use our voxel spatial indexing for now

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47:39Make EndLightingComputation() call AddProbeToSpatialIndex() on all light probes, making the latter take the ProbeP and Radius to save it having to look up the light_probe

54:58Make EndLightingComputation() accumulate the irradiance of light probes during voxelisation, introducing IrradiancePack()

1:05:05Reacquaint ourselves with GetCornerLightIndex() and GetProbeLightingFor(), noting a positional bug

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1:05:05Reacquaint ourselves with GetCornerLightIndex() and GetProbeLightingFor(), noting a positional bug

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1:05:05Reacquaint ourselves with GetCornerLightIndex() and GetProbeLightingFor(), noting a positional bug

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1:08:54Make EndLightingComputation() call GetCornerLightIndex()

1:10:19Make EndLightingComputation() stuff some test irradiance into our light probes

1:15:11Make InitLighting() and BeginLightingComputation() set up our light probe voxel grid, and EndLightingComputation() clear the ProbeIndexPtr (while meaning to clear the ProbeIndex)

1:32:47Switch ComputeLightPropagation() and friends to our new implementation of light probes, augmenting the lighting_solution with LightProbeP and LightProbeIrradiance pointers

1:42:59Make EndLightingComputation() set the solution's light probe data

1:44:14Crash in AddProbeToSpatialIndex()

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1:44:14Crash in AddProbeToSpatialIndex()

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1:44:14Crash in AddProbeToSpatialIndex()

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1:44:57Fix MapIntoGrid() to clamp the light probe voxel cell coordinates

1:49:29See something totally wrong

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1:49:29See something totally wrong

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1:49:29See something totally wrong

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1:50:12Q&A

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1:50:12Q&A

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1:50:12Q&A

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1:51:12roam00010011 handmade_hero Why does the Handmade Hero channel not have the "game development" and "programming" tags?

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1:51:12roam00010011 handmade_hero Why does the Handmade Hero channel not have the "game development" and "programming" tags?

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1:51:12roam00010011 handmade_hero Why does the Handmade Hero channel not have the "game development" and "programming" tags?

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1:52:35Brian Q: The debug text still not working? I'm guessing yes for I've not seen it, but was curious if I just missed it). I did see earlier that you have begin / end lighting

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1:52:35Brian Q: The debug text still not working? I'm guessing yes for I've not seen it, but was curious if I just missed it). I did see earlier that you have begin / end lighting

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1:52:35Brian Q: The debug text still not working? I'm guessing yes for I've not seen it, but was curious if I just missed it). I did see earlier that you have begin / end lighting

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1:53:04mindfulkid Q: Do you have any examples of good written software (open source) that you would recommend someone to study or that you yourself studied in the past?

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1:53:04mindfulkid Q: Do you have any examples of good written software (open source) that you would recommend someone to study or that you yourself studied in the past?

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1:53:04mindfulkid Q: Do you have any examples of good written software (open source) that you would recommend someone to study or that you yourself studied in the past?

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1:54:38eddiesutrecht Q: Where's puss?

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1:54:38eddiesutrecht Q: Where's puss?

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1:54:38eddiesutrecht Q: Where's puss?

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1:55:01dragoonx6 Q: " jhucktemp: Does his color scheme have a name? It's very pleasing to the eye"

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1:55:01dragoonx6 Q: " jhucktemp: Does his color scheme have a name? It's very pleasing to the eye"

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1:55:01dragoonx6 Q: " jhucktemp: Does his color scheme have a name? It's very pleasing to the eye"

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1:55:33altoverflow Q: How can we improve the web?

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1:55:33altoverflow Q: How can we improve the web?

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1:55:33altoverflow Q: How can we improve the web?

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1:58:14Brian Q: Someone had mentioned during the stream perhaps you needed 1.0f - IrrBlendU? (You had 1 - IrrBlendU). Perhaps you have already addressed this

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1:58:14Brian Q: Someone had mentioned during the stream perhaps you needed 1.0f - IrrBlendU? (You had 1 - IrrBlendU). Perhaps you have already addressed this

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1:58:14Brian Q: Someone had mentioned during the stream perhaps you needed 1.0f - IrrBlendU? (You had 1 - IrrBlendU). Perhaps you have already addressed this

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1:59:09npcxx Q: Is DirectX dependent on the C runtime? Can it be used without it?

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1:59:09npcxx Q: Is DirectX dependent on the C runtime? Can it be used without it?

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1:59:09npcxx Q: Is DirectX dependent on the C runtime? Can it be used without it?

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2:01:13Brian Q: I would guess so, because it might cast it to a integer. I had just read the chat

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2:01:13Brian Q: I would guess so, because it might cast it to a integer. I had just read the chat

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2:01:13Brian Q: I would guess so, because it might cast it to a integer. I had just read the chat

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2:01:23Walk through the IrrBlendV initialisation in terms of int-to-float conversion

2:04:31Test int-to-float conversion

2:08:52Compile and see our int-to-float conversion warning

2:10:40Confirm the compiler's reluctance to warn when converting int-to-float in the IrrBlendV initialisation

2:12:00Use 1.0f in the IrrBlendV initialisation

2:12:14Step to our int-to-float test code and inspect these values

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2:12:14Step to our int-to-float test code and inspect these values

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2:12:14Step to our int-to-float test code and inspect these values

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2:15:05Representing 5 as an int and a float

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2:15:05Representing 5 as an int and a float

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2:15:05Representing 5 as an int and a float

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2:17:56Continue to describe our test int-to-float values

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2:17:56Continue to describe our test int-to-float values

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2:17:56Continue to describe our test int-to-float values

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2:19:44Floating-point hexadecimal to binary

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2:19:44Floating-point hexadecimal to binary

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2:19:44Floating-point hexadecimal to binary

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2:20:42Check the IEEE 754 floating-point format¹^,2

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2:20:42Check the IEEE 754 floating-point format¹^,2

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2:20:42Check the IEEE 754 floating-point format¹^,2

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2:23:00Inspect TestFloat in memory

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2:23:00Inspect TestFloat in memory

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2:23:00Inspect TestFloat in memory

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2:24:07Convert TestFloat from hexadecimal to binary, and understand its floating-point representations³

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2:24:07Convert TestFloat from hexadecimal to binary, and understand its floating-point representations³

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2:24:07Convert TestFloat from hexadecimal to binary, and understand its floating-point representations³

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2:30:04Step through our int-to-float conversion of 5

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2:30:04Step through our int-to-float conversion of 5

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2:30:04Step through our int-to-float conversion of 5

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2:30:57Increase TestVal from 5 to 1 << 26

2:31:18Step through our int-to-float conversion of 1 << 26

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2:31:18Step through our int-to-float conversion of 1 << 26

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2:31:18Step through our int-to-float conversion of 1 << 26

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2:31:27Why 1 << 26 fits in a float

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2:31:27Why 1 << 26 fits in a float

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2:31:27Why 1 << 26 fits in a float

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2:32:03Set TestVal to (1 << 26) | 1

2:32:46Step through our int-to-float conversion of (1 << 26) | 1, to see our truncation problem

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2:32:46Step through our int-to-float conversion of (1 << 26) | 1, to see our truncation problem

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2:32:46Step through our int-to-float conversion of (1 << 26) | 1, to see our truncation problem

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2:34:54dragoonx6 Q: What debugger is that?⁴

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2:34:54dragoonx6 Q: What debugger is that?⁴

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2:34:54dragoonx6 Q: What debugger is that?⁴

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2:35:37Demo the sheer speed of remedybg, and praise its installation and the productivity of its writer x13pixels⁵

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2:35:37Demo the sheer speed of remedybg, and praise its installation and the productivity of its writer x13pixels⁵

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2:35:37Demo the sheer speed of remedybg, and praise its installation and the productivity of its writer x13pixels⁵

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2:37:12ryuukk_ Q: Have you tried CLion?⁶ Its debugger is awesome

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2:37:12ryuukk_ Q: Have you tried CLion?⁶ Its debugger is awesome

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2:37:12ryuukk_ Q: Have you tried CLion?⁶ Its debugger is awesome

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2:41:50Wind it down

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2:41:50Wind it down

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2:41:50Wind it down

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