Debugging Octahedral Shading — Handmade Hero — Episode Guide

0:03Recap and set the stage for the day

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0:03Recap and set the stage for the day

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0:03Recap and set the stage for the day

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0:31Demo our octahedral light map

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0:31Demo our octahedral light map

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0:31Demo our octahedral light map

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3:23Understanding the Octahedron¹

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3:23Understanding the Octahedron¹

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3:23Understanding the Octahedron¹

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4:55Orienting the octahedral wrapping by importance

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4:55Orienting the octahedral wrapping by importance

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4:55Orienting the octahedral wrapping by importance

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6:06Determine to fill in the cracks and sample the octahedron in the shaders

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6:06Determine to fill in the cracks and sample the octahedron in the shaders

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6:06Determine to fill in the cracks and sample the octahedron in the shaders

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7:36Make SampleLighting() in CompileZBiasProgram() light the pixels by their position within voxels

9:32Check out our lit voxels

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9:32Check out our lit voxels

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9:32Check out our lit voxels

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10:43Determine to sample from our octahedral map

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10:43Determine to sample from our octahedral map

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10:43Determine to sample from our octahedral map

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12:28Set up SampleLighting() to sample from the octahedral light map

15:54Make SampleLighting() compute the location from where to sample the octahedral light map

27:33Set up CompileZBiasProgram() to pass the values required by SampleLighting() to lookup into the octahedral light map

28:43Consider not using different resolutions for the light and depth maps²

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28:43Consider not using different resolutions for the light and depth maps²

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28:43Consider not using different resolutions for the light and depth maps²

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34:04Set up CompileZBiasProgram() to pass the LIGHT_LOOKUP_SQUARE_DIM to SampleLighting()

34:50Voxel Atlas UVs

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34:50Voxel Atlas UVs

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34:50Voxel Atlas UVs

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40:40Make SampleLighting() compute the dimensions required to lookup into the octahedral light map

48:19Hit shader errors

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48:19Hit shader errors

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48:19Hit shader errors

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49:18Fix the Result assignments in SampleLighting()

49:51See our darkly and incorrectly lit world

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49:51See our darkly and incorrectly lit world

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49:51See our darkly and incorrectly lit world

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50:49Change SampleLighting() to orient our lookup around the octahedron centres

55:22Hit shader errors

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55:22Hit shader errors

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55:22Hit shader errors

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55:30Fix naming in SampleLighting()

55:42See our discontinuously lit world

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55:42See our discontinuously lit world

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55:42See our discontinuously lit world

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58:13Try making SampleLighting() lookup into a shrunken area of the octahedral light map

58:48See no improvement

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58:48See no improvement

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58:48See no improvement

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59:41Introduce VOXEL_OFFSET_C() and VOXEL_OFFSET_D() for EndLightingComputation() to call

1:03:57Verify that our new macros work

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1:03:57Verify that our new macros work

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1:03:57Verify that our new macros work

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1:04:09Set up to copy the values at the seams around the octahedron³

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1:04:09Set up to copy the values at the seams around the octahedron³

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1:04:09Set up to copy the values at the seams around the octahedron³

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1:06:40Make EndLightingComputation() copy the values at the seams around the octahedron⁴

1:09:12Check out the light map

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1:09:12Check out the light map

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1:09:12Check out the light map

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1:09:39Toggle on the coloured octahedron in EndLightingComputation(), and make OpenGLChangeToSettings() zoom in to it

1:10:31Check out the light map to see no copying

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1:10:31Check out the light map to see no copying

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1:10:31Check out the light map to see no copying

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1:10:47Make EndLightingComputation() copy in to the bottom row of the octahedron

1:11:39See copying in the light map

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1:11:39See copying in the light map

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1:11:39See copying in the light map

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1:11:58Make EndLightingComputation() copy in to the top row of the octahedron

1:12:38See copying in the light map

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1:12:38See copying in the light map

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1:12:38See copying in the light map

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1:12:52Temporarily make EndLightingComputation() copy in coloured values

1:13:05See our correctly flipped copying in the light map

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1:13:05See our correctly flipped copying in the light map

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1:13:05See our correctly flipped copying in the light map

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1:13:19Make EndLightingComputation() copy in to the left and right columns of the octahedron

1:16:56See copying in the light map, only missing the corners

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1:16:56See copying in the light map, only missing the corners

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1:16:56See copying in the light map, only missing the corners

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1:17:10Check our left–right vertical copies with the paper⁵

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1:17:10Check our left–right vertical copies with the paper⁵

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1:17:10Check our left–right vertical copies with the paper⁵

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1:17:46Make EndLightingComputation() copy in to the corners of our octahedron

1:19:30See our fully filled light map

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1:19:30See our fully filled light map

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1:19:30See our fully filled light map

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1:19:41Let EndLightingComputation() populate the light map with real values

1:19:49See our full light map, with no improvement to our discontinuity

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1:19:49See our full light map, with no improvement to our discontinuity

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1:19:49See our full light map, with no improvement to our discontinuity

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1:21:05Scour CompileZBiasProgram() for octahedral mapping bugs

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1:21:05Scour CompileZBiasProgram() for octahedral mapping bugs

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1:21:05Scour CompileZBiasProgram() for octahedral mapping bugs

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1:24:11Explicitly write out the OctMapCenterUV and OctExteriorUVDim initialisations in SampleLighting(), and continue to scour this function for bugs

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1:24:11Explicitly write out the OctMapCenterUV and OctExteriorUVDim initialisations in SampleLighting(), and continue to scour this function for bugs

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1:24:11Explicitly write out the OctMapCenterUV and OctExteriorUVDim initialisations in SampleLighting(), and continue to scour this function for bugs

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1:28:21Fix OctMapInteriorUVDimC.y in SampleLighting()

1:29:43Hit shader error

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1:29:43Hit shader error

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1:29:43Hit shader error

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1:29:59Fix typo in SampleLighting()

1:30:20See different lighting discontinuities

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1:30:20See different lighting discontinuities

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1:30:20See different lighting discontinuities

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1:30:40Continue to scour SampleLighting() for bugs

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1:30:40Continue to scour SampleLighting() for bugs

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1:30:40Continue to scour SampleLighting() for bugs

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1:31:58Take a close look at our lighting discontinuities, and wonder if we have a blending error

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1:31:58Take a close look at our lighting discontinuities, and wonder if we have a blending error

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1:31:58Take a close look at our lighting discontinuities, and wonder if we have a blending error

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1:33:58Centred, Padded Lookup

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1:33:58Centred, Padded Lookup

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1:33:58Centred, Padded Lookup

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1:34:51Consider SampleLighting() to be doing a correct lookup

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1:34:51Consider SampleLighting() to be doing a correct lookup

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1:34:51Consider SampleLighting() to be doing a correct lookup

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1:35:52Toggle on the coloured octahedron in EndLightingComputation()

1:36:25Observe the lighting discontinuities along with the light map

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1:36:25Observe the lighting discontinuities along with the light map

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1:36:25Observe the lighting discontinuities along with the light map

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1:37:41Make CompileZBiasProgram() colour the world directly with light

1:37:58Observe the lighting discontinuities with the world coloured with light

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1:37:58Observe the lighting discontinuities with the world coloured with light

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1:37:58Observe the lighting discontinuities with the world coloured with light

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1:39:31Let EndLightingComputation() populate the light map with real values

1:39:37Note that the lighting discontinuities are not at copy points

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1:39:37Note that the lighting discontinuities are not at copy points

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1:39:37Note that the lighting discontinuities are not at copy points

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1:39:54Toggle on the coloured octahedron in EndLightingComputation()

1:39:58Realise why we're not smoothly interpolating between adjacent, non-copied octants

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1:39:58Realise why we're not smoothly interpolating between adjacent, non-copied octants

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1:39:58Realise why we're not smoothly interpolating between adjacent, non-copied octants

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1:40:55Toggle on linear blending in OpenGLChangeToSettings()

1:41:22Admire our continuous lighting

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1:41:22Admire our continuous lighting

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1:41:22Admire our continuous lighting

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1:41:28Let EndLightingComputation() populate the light map with real values

1:41:54Admire our continuous, yet popping lighting

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1:41:54Admire our continuous, yet popping lighting

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1:41:54Admire our continuous, yet popping lighting

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1:42:24Shoulder the Owl of Shame

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1:42:24Shoulder the Owl of Shame

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1:42:24Shoulder the Owl of Shame

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1:42:50Admire our lighting

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1:42:50Admire our lighting

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1:42:50Admire our lighting

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1:43:07Revert CompileZBiasProgram() to modulate the world's real colours with light

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1:43:07Revert CompileZBiasProgram() to modulate the world's real colours with light

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1:43:07Revert CompileZBiasProgram() to modulate the world's real colours with light

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1:43:21Admire our lighting, noting its directionality

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1:43:21Admire our lighting, noting its directionality

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1:43:21Admire our lighting, noting its directionality

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1:44:54Make CompileZBiasProgram() colour the world directly with light

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1:44:54Make CompileZBiasProgram() colour the world directly with light

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1:44:54Make CompileZBiasProgram() colour the world directly with light

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1:44:59Check out our lighting seam

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1:44:59Check out our lighting seam

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1:44:59Check out our lighting seam

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1:45:21Toggle on the coloured octahedron in EndLightingComputation()

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1:45:21Toggle on the coloured octahedron in EndLightingComputation()

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1:45:21Toggle on the coloured octahedron in EndLightingComputation()

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1:45:30Consider the seam to be along the wrapping border

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1:45:30Consider the seam to be along the wrapping border

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1:45:30Consider the seam to be along the wrapping border

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1:45:39Let EndLightingComputation() populate the light map with real values

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1:45:39Let EndLightingComputation() populate the light map with real values

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1:45:39Let EndLightingComputation() populate the light map with real values

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1:45:50Consider the seam not to be along the wrapping border

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1:45:50Consider the seam not to be along the wrapping border

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1:45:50Consider the seam not to be along the wrapping border

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1:45:59Toggle on the coloured octahedron in EndLightingComputation()

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1:45:59Toggle on the coloured octahedron in EndLightingComputation()

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1:45:59Toggle on the coloured octahedron in EndLightingComputation()

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1:46:00Consider the seam to be straight down the middle of the pink

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1:46:00Consider the seam to be straight down the middle of the pink

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1:46:00Consider the seam to be straight down the middle of the pink

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1:46:39Let EndLightingComputation() populate the light map with real values

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1:46:39Let EndLightingComputation() populate the light map with real values

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1:46:39Let EndLightingComputation() populate the light map with real values

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1:46:49See the seam run in a different orientation

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1:46:49See the seam run in a different orientation

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1:46:49See the seam run in a different orientation

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1:46:59Toggle on the coloured octahedron in EndLightingComputation()

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1:46:59Toggle on the coloured octahedron in EndLightingComputation()

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1:46:59Toggle on the coloured octahedron in EndLightingComputation()

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1:47:06Inspect our seam

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1:47:06Inspect our seam

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1:47:06Inspect our seam

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1:47:58Let EndLightingComputation() populate the light map with real values

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1:47:58Let EndLightingComputation() populate the light map with real values

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1:47:58Let EndLightingComputation() populate the light map with real values

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1:48:13Note the brightening as the character hops up

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1:48:13Note the brightening as the character hops up

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1:48:13Note the brightening as the character hops up

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1:49:42Try making SumLight() sample the lighting from the direction you're pointing, ignoring the actual reflection vector

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1:49:42Try making SumLight() sample the lighting from the direction you're pointing, ignoring the actual reflection vector

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1:49:42Try making SumLight() sample the lighting from the direction you're pointing, ignoring the actual reflection vector

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1:49:57See no lighting discontinuities

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1:49:57See no lighting discontinuities

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1:49:57See no lighting discontinuities

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1:51:21Revert SumLight() to use the reflection vector

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1:51:21Revert SumLight() to use the reflection vector

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1:51:21Revert SumLight() to use the reflection vector

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1:52:02Wonder if EndLightingComputation() is populating the octahedron incorrectly

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1:52:02Wonder if EndLightingComputation() is populating the octahedron incorrectly

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1:52:02Wonder if EndLightingComputation() is populating the octahedron incorrectly

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1:53:16Sampling Within Pixels

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1:53:16Sampling Within Pixels

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1:53:16Sampling Within Pixels

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1:55:08Fix EndLightingComputation() to offset the light population by half a pixel

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1:55:08Fix EndLightingComputation() to offset the light population by half a pixel

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1:55:08Fix EndLightingComputation() to offset the light population by half a pixel

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1:56:29Still see the seam

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1:56:29Still see the seam

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1:56:29Still see the seam

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1:56:49Toggle EndLightingComputation() between offsetting the light population and not, to see difference but no improvement

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1:56:49Toggle EndLightingComputation() between offsetting the light population and not, to see difference but no improvement

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1:56:49Toggle EndLightingComputation() between offsetting the light population and not, to see difference but no improvement

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1:58:29Q&A

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1:58:29Q&A

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1:58:29Q&A

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1:59:01somebody_took_my_name Q: Can you vary the light height to see its impact?

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1:59:01somebody_took_my_name Q: Can you vary the light height to see its impact?

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1:59:01somebody_took_my_name Q: Can you vary the light height to see its impact?

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1:59:29somebody_took_my_name Either way

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1:59:29somebody_took_my_name Either way

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1:59:29somebody_took_my_name Either way

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1:59:30uplinkcoder Q: Can you draw in the light probe positions?

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1:59:30uplinkcoder Q: Can you draw in the light probe positions?

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1:59:30uplinkcoder Q: Can you draw in the light probe positions?

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2:00:15Make EndLightingComputation() draw the light probes, introducing IsInDebugVoxDim()

2:07:18See our misplaced light probes

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2:07:18See our misplaced light probes

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2:07:18See our misplaced light probes

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2:07:39Fix the position of the light probe drawing in EndLightingComputation()

2:09:52See our light probes, and consider the brightening to be due to a Z-discontinuity

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2:09:52See our light probes, and consider the brightening to be due to a Z-discontinuity

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2:09:52See our light probes, and consider the brightening to be due to a Z-discontinuity

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2:11:36snubbykins Q: Should you gutter copy from the opposite / flipped sides of the octal mapping so the bilinear blend will blend correctly?⁶

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2:11:36snubbykins Q: Should you gutter copy from the opposite / flipped sides of the octal mapping so the bilinear blend will blend correctly?⁶

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2:11:36snubbykins Q: Should you gutter copy from the opposite / flipped sides of the octal mapping so the bilinear blend will blend correctly?⁶

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2:12:50Make UpdateAndRenderWorld() vary the height of the light

2:14:35See no light popping

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2:14:35See no light popping

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2:14:35See no light popping

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2:14:48Increase the height variance of the light in UpdateAndRenderWorld()

2:15:02See light popping as the light passes through probes

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2:15:02See light popping as the light passes through probes

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2:15:02See light popping as the light passes through probes

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2:18:48Remove the light height varying code

2:18:58Call it for today

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2:18:58Call it for today

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2:18:58Call it for today

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