Switching to Precomputed Hemisphere Distributions — Handmade Hero — Episode Guide

0:06combicombi Q: Casey, was just watching the previous stream about getting better noise sampling, and I was wondering why you need any randomness if you obtain a pretty evenly and well-covered sampling hemisphere?

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0:06combicombi Q: Casey, was just watching the previous stream about getting better noise sampling, and I was wondering why you need any randomness if you obtain a pretty evenly and well-covered sampling hemisphere?

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0:06combicombi Q: Casey, was just watching the previous stream about getting better noise sampling, and I was wondering why you need any randomness if you obtain a pretty evenly and well-covered sampling hemisphere?

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0:49Undersampling, and moving noise to the least objectionable place

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0:49Undersampling, and moving noise to the least objectionable place

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0:49Undersampling, and moving noise to the least objectionable place

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10:59Run the game to see how our lighting is working at the moment

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10:59Run the game to see how our lighting is working at the moment

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10:59Run the game to see how our lighting is working at the moment

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14:20Add SamplePoints to the lighting_solution and loft our hemisphere generation code out to GenerateSpiralSamples() and GeneratePoissonSamples()

21:19Run the game to see our spiral sample

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21:19Run the game to see our spiral sample

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21:19Run the game to see our spiral sample

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21:33Add keybindings for GeneratePoissonSamples() and GenerateSpiralSamples() in UpdateAndRenderWorld(), and reduce the MaxCos value in GeneratePoissonSamples()

24:24Run the game and check out our two sampling patterns

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24:24Run the game and check out our two sampling patterns

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24:24Run the game and check out our two sampling patterns

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25:23Make LightingTest() draw connections between clusters of sampling points

27:52Run the game to see our cluster of sampling points, and consider other sampling patterns¹^,2^,3^,4

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27:52Run the game to see our cluster of sampling points, and consider other sampling patterns¹^,2^,3^,4

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27:52Run the game to see our cluster of sampling points, and consider other sampling patterns¹^,2^,3^,4

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36:41Run the game and consider gleaning more structure from the spiral sampling over time

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36:41Run the game and consider gleaning more structure from the spiral sampling over time

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36:41Run the game and consider gleaning more structure from the spiral sampling over time

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37:37Make LightingTest() colour the sampling points over time

39:49Run the game to see our coloured sampling points

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39:49Run the game to see our coloured sampling points

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39:49Run the game to see our coloured sampling points

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43:51Vary the N2 value in GenerateSpiralSamples() to sample variable coverage of the sphere

45:42Run the game to see this variable coverage

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45:42Run the game to see this variable coverage

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45:42Run the game to see this variable coverage

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46:15Make GenerateSpiralSamples() offset the coverage rotationally (i.e. spin the spirals)

47:40Run the game to see this spin

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47:40Run the game to see this spin

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47:40Run the game to see this spin

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47:49Combine these coverage schemes in GenerateSpiralSamples()

48:00Run the game to see the variable coverage, and consider how to generate points in clusters

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48:00Run the game to see the variable coverage, and consider how to generate points in clusters

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48:00Run the game to see the variable coverage, and consider how to generate points in clusters

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50:33Introduce the notion of a ClusterTable in LightingTest() to generate clusters of points

55:37Check out our first cluster

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55:37Check out our first cluster

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55:37Check out our first cluster

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56:47Start to build up our ClusterTable in LightingTest(), also visualising the clusters as lines relative to the entire set

59:39Run the game to see our clusters

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59:39Run the game to see our clusters

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59:39Run the game to see our clusters

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1:00:18Continue to build up our ClusterTable

1:01:10Check out this new cluster and consider how best to tessellate our clusters

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1:01:10Check out this new cluster and consider how best to tessellate our clusters

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1:01:10Check out this new cluster and consider how best to tessellate our clusters

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1:04:04Introduce GeneratePolarSamples()

1:07:47Polar sampling, derived from the height up the sphere

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1:07:47Polar sampling, derived from the height up the sphere

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1:07:47Polar sampling, derived from the height up the sphere

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1:09:29Continue to implement GeneratePolarSamples(), adding a key to trigger this pattern

1:11:50Check out this polar pattern, and consider making the spoke count proportional to the slice

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1:11:50Check out this polar pattern, and consider making the spoke count proportional to the slice

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1:11:50Check out this polar pattern, and consider making the spoke count proportional to the slice

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1:13:18Introduce a SpokeTable in GeneratePolarSamples() to distribute the samples around the sphere

1:18:29Check out this polar pattern

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1:18:29Check out this polar pattern

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1:18:29Check out this polar pattern

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1:18:41Bias the z away from directly up and reduce the SliceCount in GeneratePolarSamples()

1:21:03Check out our awesome polar pattern, and consider how to line the samples up for casting purposes

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1:21:03Check out our awesome polar pattern, and consider how to line the samples up for casting purposes

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1:21:03Check out our awesome polar pattern, and consider how to line the samples up for casting purposes

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1:23:09Reduce the SliceCount to 5 and introduce vertical jitter in GeneratePolarSamples()

1:26:13Check out the polar jitter, and consider how to cluster our sampling points in terms of the jitter

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1:26:13Check out the polar jitter, and consider how to cluster our sampling points in terms of the jitter

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1:26:13Check out the polar jitter, and consider how to cluster our sampling points in terms of the jitter

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1:31:59Store SamplePoints as a matrix of v3_4x in lighting_solution, and enable InitLighting() to cluster up the samples

1:41:06Check out our slightly broken lighting

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1:41:06Check out our slightly broken lighting

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1:41:06Check out our slightly broken lighting

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1:41:22Enable ComputeLightPropagation() to reorient the SampleD4x along the sample point normal

1:43:50Check out this potentially more correct lighting

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1:43:50Check out this potentially more correct lighting

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1:43:50Check out this potentially more correct lighting

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1:46:06Q&A

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1:46:06Q&A

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1:46:06Q&A

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1:47:04ssylvan handmade_hero By the way, I mentioned this on twitter but the easiest way to compute a cosine distribution is to start with a 2D disk distribution for x / y then compute z by projecting to sphere (z = sqrt(1 - x^2 - y^2))

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1:47:04ssylvan handmade_hero By the way, I mentioned this on twitter but the easiest way to compute a cosine distribution is to start with a 2D disk distribution for x / y then compute z by projecting to sphere (z = sqrt(1 - x^2 - y^2))

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1:47:04ssylvan handmade_hero By the way, I mentioned this on twitter but the easiest way to compute a cosine distribution is to start with a 2D disk distribution for x / y then compute z by projecting to sphere (z = sqrt(1 - x^2 - y^2))

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1:48:12thejimjames40 Q: Do you have some resources for researching different game / system architectures in C? I'd like to focus on the data layout⁵

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1:48:12thejimjames40 Q: Do you have some resources for researching different game / system architectures in C? I'd like to focus on the data layout⁵

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1:48:12thejimjames40 Q: Do you have some resources for researching different game / system architectures in C? I'd like to focus on the data layout⁵

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1:51:33blackburn1911 Q: What should I / we do everyday to become a good programmer like you, Jon Blow, etc?

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1:51:33blackburn1911 Q: What should I / we do everyday to become a good programmer like you, Jon Blow, etc?

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1:51:33blackburn1911 Q: What should I / we do everyday to become a good programmer like you, Jon Blow, etc?

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1:53:42elfeck Q: Do you use templates in the code right now?

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1:53:42elfeck Q: Do you use templates in the code right now?

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1:53:42elfeck Q: Do you use templates in the code right now?

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1:53:58bas170400 Q: Hi, I am programming my first game (2D) as an intake assignment from my next education. The game uses an EntityComponentSystem. But now I'm stuck because I want different entities to have different animations for different situations but I don't know how to implement that. So my question is how do I go about that without writing different sprite components for every different entity type? All sorts of information is welcome

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1:53:58bas170400 Q: Hi, I am programming my first game (2D) as an intake assignment from my next education. The game uses an EntityComponentSystem. But now I'm stuck because I want different entities to have different animations for different situations but I don't know how to implement that. So my question is how do I go about that without writing different sprite components for every different entity type? All sorts of information is welcome

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1:53:58bas170400 Q: Hi, I am programming my first game (2D) as an intake assignment from my next education. The game uses an EntityComponentSystem. But now I'm stuck because I want different entities to have different animations for different situations but I don't know how to implement that. So my question is how do I go about that without writing different sprite components for every different entity type? All sorts of information is welcome

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2:00:16vkar2 Q: I played with the spiral, and had problems with the angular falloff

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2:00:16vkar2 Q: I played with the spiral, and had problems with the angular falloff

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2:00:16vkar2 Q: I played with the spiral, and had problems with the angular falloff

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2:00:4330ygamer Q: First timer here. From what I saw it looks like organizational-wise a lot of things are bundled together in your code. How do you handle organizing a lot of code in general? Is it a C / C++ thing to have so many things together? I'm just kinda used to having small pieces of code

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2:00:4330ygamer Q: First timer here. From what I saw it looks like organizational-wise a lot of things are bundled together in your code. How do you handle organizing a lot of code in general? Is it a C / C++ thing to have so many things together? I'm just kinda used to having small pieces of code

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2:00:4330ygamer Q: First timer here. From what I saw it looks like organizational-wise a lot of things are bundled together in your code. How do you handle organizing a lot of code in general? Is it a C / C++ thing to have so many things together? I'm just kinda used to having small pieces of code

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2:02:38gorevojd Q: Casey, I just want to say you thank you for everything. I started to watch you in 2014, when I graduated from university. You taught me more than all of my teachers there. I love game development and I love programming all because of you. Just thank you

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2:02:38gorevojd Q: Casey, I just want to say you thank you for everything. I started to watch you in 2014, when I graduated from university. You taught me more than all of my teachers there. I love game development and I love programming all because of you. Just thank you

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2:02:38gorevojd Q: Casey, I just want to say you thank you for everything. I started to watch you in 2014, when I graduated from university. You taught me more than all of my teachers there. I love game development and I love programming all because of you. Just thank you

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2:03:09esert Q: Did you find an answer to your questions in 'Are Register Names Still Useful?'?⁶

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2:03:09esert Q: Did you find an answer to your questions in 'Are Register Names Still Useful?'?⁶

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2:03:09esert Q: Did you find an answer to your questions in 'Are Register Names Still Useful?'?⁶

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2:05:39phort99 Q: You mentioned not using templates. Do you use any code generation / metaprogramming at all?

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2:05:39phort99 Q: You mentioned not using templates. Do you use any code generation / metaprogramming at all?

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2:05:39phort99 Q: You mentioned not using templates. Do you use any code generation / metaprogramming at all?

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2:06:09thejimjames40 Q: Every time I am designing the data layout of a game / system I get very happy inside. Is this normal? Or should I see a psychiatrist? Also I absolutely love the sections about the entity system and game design decisions

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2:06:09thejimjames40 Q: Every time I am designing the data layout of a game / system I get very happy inside. Is this normal? Or should I see a psychiatrist? Also I absolutely love the sections about the entity system and game design decisions

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2:06:09thejimjames40 Q: Every time I am designing the data layout of a game / system I get very happy inside. Is this normal? Or should I see a psychiatrist? Also I absolutely love the sections about the entity system and game design decisions

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2:06:30sneakybob_wot Q: How much more optimized do you think you'll be able to get this lighting code once you've sorted out this bundling?

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2:06:30sneakybob_wot Q: How much more optimized do you think you'll be able to get this lighting code once you've sorted out this bundling?

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2:06:30sneakybob_wot Q: How much more optimized do you think you'll be able to get this lighting code once you've sorted out this bundling?

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2:06:47bozemoto Q: I'm a programmer with three years' experience, what would you recommend for someone with my experience level to do to improve as a developer. I've been trying to learn new things outside of work, while avoiding breaking the non-compete part of my contract

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2:06:47bozemoto Q: I'm a programmer with three years' experience, what would you recommend for someone with my experience level to do to improve as a developer. I've been trying to learn new things outside of work, while avoiding breaking the non-compete part of my contract

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2:06:47bozemoto Q: I'm a programmer with three years' experience, what would you recommend for someone with my experience level to do to improve as a developer. I've been trying to learn new things outside of work, while avoiding breaking the non-compete part of my contract

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2:07:42pythno Q: Do you still use your Amiga?

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2:07:42pythno Q: Do you still use your Amiga?

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2:07:42pythno Q: Do you still use your Amiga?

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2:08:23Close things down

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2:08:23Close things down

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2:08:23Close things down

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