Loading sampled BRDF data
References ▼
Disney Animation
BRDF Explorer
[1]19:02
Brent Burley (Walt Disney Animation Studios)
Physically-Based Shading at Disney
[2]19:02[7]27:34[8]31:21
ShaderToy
Disney Principled BRDF
[3]19:02
GitHub
brdf/​src/​brdfs/​disney.brdf
[4]25:10
Shih-Chin
Implementing Disney Principled BRDF in Arnold
[5]25:10
Rendering Equations
Rendering the Moana Island Scene Part 1: Implementing the Disney BSDF
[6]25:10
Wikipedia
Gonioreflectometer
[9]31:21
MERL - Mitsubishi Electric Research Laboratories
MERL BRDF Database
[10]31:21
Wojciech Matusik, Hanspeter Pfister, Matt Brand and Leonard McMillan
A Data-Driven Reflectance Model
[11]39:21[16]1:04:12[19]1:15:26
[23]1:37:14[24]1:43:36[26]1:45:44
MERL - Mitsubishi Electric Research Laboratories
BRDFRead.cpp
[12]46:56[13]47:52[14]55:28
[15]1:04:12[17]1:08:41[18]1:15:26
[22]1:37:14[25]1:45:44[28]1:51:45
[31]2:13:51[32]2:21:57[33]2:25:26
[34]2:30:14
Wikipedia
Spherical cow
[20]1:29:05
Wikipedia
Hairy ball theorem
[21]1:29:05
Szymon Rusinkiewicz
A New Change of Variables for Efficient BRDF Representation
[27]1:45:44[29]1:57:52
Intel
Intel Intrinsics Guide
[30]2:10:10
Bruce Walter, Stephen R. Marschner, Hongsong Li and Kenneth E. Torrance
Microfacet Models for Refraction through Rough Surfaces
[35]2:47:24
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Host
Casey Muratori
Indexer
Matt Mascarenhas
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0:01Welcome to the stream
🗩
0:01Welcome to the stream
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0:01Welcome to the stream
🗩
0:26Reacquaint ourselves with the ray tracer
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0:26Reacquaint ourselves with the ray tracer
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0:26Reacquaint ourselves with the ray tracer
📖
1:26Default LANE_WIDTH to 8 if not defined on our build line
1:26Default LANE_WIDTH to 8 if not defined on our build line
1:26Default LANE_WIDTH to 8 if not defined on our build line
1:47Check out our 2017_10_22_Day01.txt performance dump
🗹
1:47Check out our 2017_10_22_Day01.txt performance dump
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1:47Check out our 2017_10_22_Day01.txt performance dump
🗹
2:37Admire our 2017_11_19_Day08_8x.bmp image
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2:37Admire our 2017_11_19_Day08_8x.bmp image
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2:37Admire our 2017_11_19_Day08_8x.bmp image
🎨
3:34Determine to add some importance sampling and / or material properties
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3:34Determine to add some importance sampling and / or material properties
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3:34Determine to add some importance sampling and / or material properties
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4:27Try to run the ray caster
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4:27Try to run the ray caster
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4:27Try to run the ray caster
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5:59Reacquaint ourselves with CastSampleRays()
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5:59Reacquaint ourselves with CastSampleRays()
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5:59Reacquaint ourselves with CastSampleRays()
📖
10:06Consider adding some exposure control
📖
10:06Consider adding some exposure control
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10:06Consider adding some exposure control
📖
10:57Try increasing the redness of the 4th material's EmitColor from 4 to 20
10:57Try increasing the redness of the 4th material's EmitColor from 4 to 20
10:57Try increasing the redness of the 4th material's EmitColor from 4 to 20
11:22Run the program
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11:22Run the program
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11:22Run the program
🏃
11:37Admire our image with more red emittance
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11:37Admire our image with more red emittance
🎨
11:37Admire our image with more red emittance
🎨
12:45Try increasing the redness of the 4th material's EmitColor from 20 to 50
12:45Try increasing the redness of the 4th material's EmitColor from 20 to 50
12:45Try increasing the redness of the 4th material's EmitColor from 20 to 50
12:52Run the program
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12:52Run the program
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12:52Run the program
🏃
13:02Admire our image with yet more red emittance
🎨
13:02Admire our image with yet more red emittance
🎨
13:02Admire our image with yet more red emittance
🎨
14:17Introduce a second plane
14:17Introduce a second plane
14:17Introduce a second plane
14:47Run the program
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14:47Run the program
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14:47Run the program
🏃
15:06Admire our image with two planes
🎨
15:06Admire our image with two planes
🎨
15:06Admire our image with two planes
🎨
15:52Try decreasing the d of the 2nd plane from 10 to 2
15:52Try decreasing the d of the 2nd plane from 10 to 2
15:52Try decreasing the d of the 2nd plane from 10 to 2
15:57Run the program
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15:57Run the program
🏃
15:57Run the program
🏃
16:29Admire our image with the second plane cutting through the blue hemisphere
🎨
16:29Admire our image with the second plane cutting through the blue hemisphere
🎨
16:29Admire our image with the second plane cutting through the blue hemisphere
🎨
17:11Determine to vary the light based on direction
🎨
17:11Determine to vary the light based on direction
🎨
17:11Determine to vary the light based on direction
🎨
17:44Try adding some Green and Blue to the 4th material's EmitColor, and take RaysPerPixel as a command line argument
17:44Try adding some Green and Blue to the 4th material's EmitColor, and take RaysPerPixel as a command line argument
17:44Try adding some Green and Blue to the 4th material's EmitColor, and take RaysPerPixel as a command line argument
18:13Run the program with and without passing a RaysPerPixel
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18:13Run the program with and without passing a RaysPerPixel
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18:13Run the program with and without passing a RaysPerPixel
🏃
18:32Admire our image with orange emittance
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18:32Admire our image with orange emittance
🎨
18:32Admire our image with orange emittance
🎨
19:02Research Disney's standard BRDF (Bidirectional Reflectance Distribution Function)1,2,3
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19:02Research Disney's standard BRDF (Bidirectional Reflectance Distribution Function)1,2,3
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19:02Research Disney's standard BRDF (Bidirectional Reflectance Distribution Function)1,2,3
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25:10Research reference implementations of Disney's Principled BRDF4,5,6
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25:10Research reference implementations of Disney's Principled BRDF4,5,6
📖
25:10Research reference implementations of Disney's Principled BRDF4,5,6
📖
27:34Prepare to proceed, reading 2 "The microfacet model"7
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27:34Prepare to proceed, reading 2 "The microfacet model"7
📖
27:34Prepare to proceed, reading 2 "The microfacet model"7
📖
31:21Read 3 "Visualizing measured BDRFs",8 describing a gonioreflectometer9 and checking out MERL's BRDF database10
📖
31:21Read 3 "Visualizing measured BDRFs",8 describing a gonioreflectometer9 and checking out MERL's BRDF database10
📖
31:21Read 3 "Visualizing measured BDRFs",8 describing a gonioreflectometer9 and checking out MERL's BRDF database10
📖
39:21Read 'A Data-Driven Reflectance Model'11
📖
39:21Read 'A Data-Driven Reflectance Model'11
📖
39:21Read 'A Data-Driven Reflectance Model'11
📖
46:56Consult the BRDF reference implementation in MERL's BRDF database12
📖
46:56Consult the BRDF reference implementation in MERL's BRDF database12
📖
46:56Consult the BRDF reference implementation in MERL's BRDF database12
📖
47:52Embark on our BRDF loader, introducing brdf_table and LoadMERLBinary()13
47:52Embark on our BRDF loader, introducing brdf_table and LoadMERLBinary()13
47:52Embark on our BRDF loader, introducing brdf_table and LoadMERLBinary()13
54:27Organise our MERL .binary files
🗹
54:27Organise our MERL .binary files
🗹
54:27Organise our MERL .binary files
🗹
55:28Set up to call LoadMERLBinary(), changing it to handle three colour channels14
55:28Set up to call LoadMERLBinary(), changing it to handle three colour channels14
55:28Set up to call LoadMERLBinary(), changing it to handle three colour channels14
1:00:19Run the program, to see no progress printout
🏃
1:00:19Run the program, to see no progress printout
🏃
1:00:19Run the program, to see no progress printout
🏃
1:03:33Run the program with 16 RaysPerPixel
🏃
1:03:33Run the program with 16 RaysPerPixel
🏃
1:03:33Run the program with 16 RaysPerPixel
🏃
1:03:55Admire our test.bmp
🎨
1:03:55Admire our test.bmp
🎨
1:03:55Admire our test.bmp
🎨
1:04:12Determine to sample the BRDF values, first learning about the colour scaling values15,16
📖
1:04:12Determine to sample the BRDF values, first learning about the colour scaling values15,16
📖
1:04:12Determine to sample the BRDF values, first learning about the colour scaling values15,16
📖
1:08:41Change LoadMERLBinary() to read in the colour channels as per the reference implementation17
1:08:41Change LoadMERLBinary() to read in the colour channels as per the reference implementation17
1:08:41Change LoadMERLBinary() to read in the colour channels as per the reference implementation17
1:11:09Upgrade CastSampleRays() to attenuate by the BRDF-sampled reflectance colour, introducing BRDFLookup()
1:11:09Upgrade CastSampleRays() to attenuate by the BRDF-sampled reflectance colour, introducing BRDFLookup()
1:11:09Upgrade CastSampleRays() to attenuate by the BRDF-sampled reflectance colour, introducing BRDFLookup()
1:15:26Implement BRDFLookup(), informed by the reference implementation18 and 'A Data-Driven Reflectance Model'19
1:15:26Implement BRDFLookup(), informed by the reference implementation18 and 'A Data-Driven Reflectance Model'19
1:15:26Implement BRDFLookup(), informed by the reference implementation18 and 'A Data-Driven Reflectance Model'19
1:29:05Coordinate System on a Sphere20,21
🖌
1:29:05Coordinate System on a Sphere20,21
🖌
1:29:05Coordinate System on a Sphere20,21
🖌
1:33:14Make CastSampleRays() generate a coordinate system for our sampling sphere, to pass to BRDFLookup()
1:33:14Make CastSampleRays() generate a coordinate system for our sampling sphere, to pass to BRDFLookup()
1:33:14Make CastSampleRays() generate a coordinate system for our sampling sphere, to pass to BRDFLookup()
1:37:14Consult our documents22,23 on computation of the diff vector
📖
1:37:14Consult our documents22,23 on computation of the diff vector
📖
1:37:14Consult our documents22,23 on computation of the diff vector
📖
1:39:22Make BRDFLookup() compute ThetaHalf and PhiHalf, after mapping the LightDir and HalfVector in to the tangent space of the reflection
1:39:22Make BRDFLookup() compute ThetaHalf and PhiHalf, after mapping the LightDir and HalfVector in to the tangent space of the reflection
1:39:22Make BRDFLookup() compute ThetaHalf and PhiHalf, after mapping the LightDir and HalfVector in to the tangent space of the reflection
1:43:36Make BRDFLookup() compute ThetaDiff24
1:43:36Make BRDFLookup() compute ThetaDiff24
1:43:36Make BRDFLookup() compute ThetaDiff24
1:45:44Come to understand the PhiDiff computation25,26,27
📖
1:45:44Come to understand the PhiDiff computation25,26,27
📖
1:45:44Come to understand the PhiDiff computation25,26,27
📖
1:49:30Rename Bitangent to Binormal in plane
1:49:30Rename Bitangent to Binormal in plane
1:49:30Rename Bitangent to Binormal in plane
1:51:45Locating a (Light) Vector in a Transformed Coordinate System28
🖌
1:51:45Locating a (Light) Vector in a Transformed Coordinate System28
🖌
1:51:45Locating a (Light) Vector in a Transformed Coordinate System28
🖌
1:57:52Efficiently locating a (Light) Vector in a Transformed Coordinate System29
🖌
1:57:52Efficiently locating a (Light) Vector in a Transformed Coordinate System29
🖌
1:57:52Efficiently locating a (Light) Vector in a Transformed Coordinate System29
🖌
2:04:37Make BRDFLookup() efficiently compute the PhiDiff
2:04:37Make BRDFLookup() efficiently compute the PhiDiff
2:04:37Make BRDFLookup() efficiently compute the PhiDiff
2:10:10Introduce ExtractF32() for BRDFLookup() to call30
2:10:10Introduce ExtractF32() for BRDFLookup() to call30
2:10:10Introduce ExtractF32() for BRDFLookup() to call30
2:13:51Make BRDFLookup() look up the colour values31
2:13:51Make BRDFLookup() look up the colour values31
2:13:51Make BRDFLookup() look up the colour values31
2:21:57Begin to make BRDFLookup() index in to the BRDF table32
2:21:57Begin to make BRDFLookup() index in to the BRDF table32
2:21:57Begin to make BRDFLookup() index in to the BRDF table32
2:25:26Wonder if the squaring and rooting is correct33
📖
2:25:26Wonder if the squaring and rooting is correct33
📖
2:25:26Wonder if the squaring and rooting is correct33
📖
2:28:34I = √t × R²
🖌
2:28:34I = √t × R²
🖌
2:28:34I = √t × R²
🖌
2:30:14Finish making BRDFLookup() index in to the BRDF table34
2:30:14Finish making BRDFLookup() index in to the BRDF table34
2:30:14Finish making BRDFLookup() index in to the BRDF table34
2:37:16Run the program to find uninitialised Values
🏃
2:37:16Run the program to find uninitialised Values
🏃
2:37:16Run the program to find uninitialised Values
🏃
2:38:41Introduce NullBRDF()
2:38:41Introduce NullBRDF()
2:38:41Introduce NullBRDF()
2:40:25Run the program
🏃
2:40:25Run the program
🏃
2:40:25Run the program
🏃
2:40:39Admire our test.bmp
🎨
2:40:39Admire our test.bmp
🎨
2:40:39Admire our test.bmp
🎨
2:41:06Q&A
🗩
2:41:06Q&A
🗩
2:41:06Q&A
🗩
2:41:48xxthebigfoxx Q: When computing the sphere bitangent, could you just NOZ the tangent before computing the Bitangent so you don't have to NOZ the Bitangent afterwards?
🗪
2:41:48xxthebigfoxx Q: When computing the sphere bitangent, could you just NOZ the tangent before computing the Bitangent so you don't have to NOZ the Bitangent afterwards?
🗪
2:41:48xxthebigfoxx Q: When computing the sphere bitangent, could you just NOZ the tangent before computing the Bitangent so you don't have to NOZ the Bitangent afterwards?
🗪
2:42:22Save BRDFLookup() from performing NOZ() on the DiffX, and make it perform NOZ() when initialising SphereTangent to save doing in on the SphereBinormal
2:42:22Save BRDFLookup() from performing NOZ() on the DiffX, and make it perform NOZ() when initialising SphereTangent to save doing in on the SphereBinormal
2:42:22Save BRDFLookup() from performing NOZ() on the DiffX, and make it perform NOZ() when initialising SphereTangent to save doing in on the SphereBinormal
2:43:28somebody_took_my_name Q: Talking about ray and Linux and more beautiful code, there is still a GitHub issue about memory loading in SIMD
🗪
2:43:28somebody_took_my_name Q: Talking about ray and Linux and more beautiful code, there is still a GitHub issue about memory loading in SIMD
🗪
2:43:28somebody_took_my_name Q: Talking about ray and Linux and more beautiful code, there is still a GitHub issue about memory loading in SIMD
🗪
2:43:40pythno Q: Is the BRDS essentially a function that tells us which rays within the hemisphere to use?
🗪
2:43:40pythno Q: Is the BRDS essentially a function that tells us which rays within the hemisphere to use?
🗪
2:43:40pythno Q: Is the BRDS essentially a function that tells us which rays within the hemisphere to use?
🗪
2:43:53smack_ssbm Q: Do you get "uncanny valley" impressions sometimes when looking at raytraced images? If so, what strategies might you have to mitigate that?
🗪
2:43:53smack_ssbm Q: Do you get "uncanny valley" impressions sometimes when looking at raytraced images? If so, what strategies might you have to mitigate that?
🗪
2:43:53smack_ssbm Q: Do you get "uncanny valley" impressions sometimes when looking at raytraced images? If so, what strategies might you have to mitigate that?
🗪
2:44:28pythno Q: BRDF, yes, typo, sorry
🗪
2:44:28pythno Q: BRDF, yes, typo, sorry
🗪
2:44:28pythno Q: BRDF, yes, typo, sorry
🗪
2:45:21xxthebigfoxx Q: Will you finish this tomorrow?
🗪
2:45:21xxthebigfoxx Q: Will you finish this tomorrow?
🗪
2:45:21xxthebigfoxx Q: Will you finish this tomorrow?
🗪
2:45:31sagian2005 Q: The sound was fine and it was synced. Your camera frame rate seems low, though
🗪
2:45:31sagian2005 Q: The sound was fine and it was synced. Your camera frame rate seems low, though
🗪
2:45:31sagian2005 Q: The sound was fine and it was synced. Your camera frame rate seems low, though
🗪
2:45:53tocsin16 Q: Have you thought about implementing GGX for Handmade Ray?
🗪
2:45:53tocsin16 Q: Have you thought about implementing GGX for Handmade Ray?
🗪
2:45:53tocsin16 Q: Have you thought about implementing GGX for Handmade Ray?
🗪
2:46:52tinspin Q: How much of modern skin mesh animation did you contribute to?
🗪
2:46:52tinspin Q: How much of modern skin mesh animation did you contribute to?
🗪
2:46:52tinspin Q: How much of modern skin mesh animation did you contribute to?
🗪
2:47:24tocsin16 Q: Haha, this is what I'm talking about35
🗪
2:47:24tocsin16 Q: Haha, this is what I'm talking about35
🗪
2:47:24tocsin16 Q: Haha, this is what I'm talking about35
🗪
2:49:26pythno Q: Alright, thanks. But what function chooses the outgoing rays to use? Because it will affect the outcome of the picture. It gets fuzzier if the rays spread in more directions
🗪
2:49:26pythno Q: Alright, thanks. But what function chooses the outgoing rays to use? Because it will affect the outcome of the picture. It gets fuzzier if the rays spread in more directions
🗪
2:49:26pythno Q: Alright, thanks. But what function chooses the outgoing rays to use? Because it will affect the outcome of the picture. It gets fuzzier if the rays spread in more directions
🗪
2:49:50Equally vs BRDF weighted sampling
🖌
2:49:50Equally vs BRDF weighted sampling
🖌
2:49:50Equally vs BRDF weighted sampling
🖌
2:53:21tinspin Q: Did shader weighted skin mesh animation exist before you started meddling with it? How did it evolve, and do you see any future improvements possible on it?
🗪
2:53:21tinspin Q: Did shader weighted skin mesh animation exist before you started meddling with it? How did it evolve, and do you see any future improvements possible on it?
🗪
2:53:21tinspin Q: Did shader weighted skin mesh animation exist before you started meddling with it? How did it evolve, and do you see any future improvements possible on it?
🗪
2:56:36tocsin16 Q: I see missed the start of the stream so didn't realize the dataset was a requirement. I don't know if there is set of measured GGX BRDFs. It is a very common BRDF used in offline pathtracing for film (and I think gaining popularity in the realtime world too). Thanks for the education streams!
🗪
2:56:36tocsin16 Q: I see missed the start of the stream so didn't realize the dataset was a requirement. I don't know if there is set of measured GGX BRDFs. It is a very common BRDF used in offline pathtracing for film (and I think gaining popularity in the realtime world too). Thanks for the education streams!
🗪
2:56:36tocsin16 Q: I see missed the start of the stream so didn't realize the dataset was a requirement. I don't know if there is set of measured GGX BRDFs. It is a very common BRDF used in offline pathtracing for film (and I think gaining popularity in the realtime world too). Thanks for the education streams!
🗪
2:57:14ryanfleury Was the game Messiah?
🗪
2:57:14ryanfleury Was the game Messiah?
🗪
2:57:14ryanfleury Was the game Messiah?
🗪
2:58:26Wrap it up
🗩
2:58:26Wrap it up
🗩
2:58:26Wrap it up
🗩
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