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1:43 Off we go with a bit of a recap
3:51 Talk about MakeSphereNormalMap and GPU vs CPU renderer
4:54 Make TreeNormal for MakeSphereNormalMap to use
7:23 Get the game running, look at the unpacking of the NormalMap and change the way that it's packed
9:05 Blackboard: Consider the hacky nature of the problem
11:38 Blackboard: The Ground's normals
14:03 Handle front-facing bitmaps for now, starting by introducing UnscaleAndBiasNormal
16:21 Check it out in-game and look back through the code
17:28 Draw just the Normal and force Texel.a to be 1.0f
18:17 Step through the NormalMap code
19:14 Moment of realisation: We were still sampling out of the Texture
19:43 Continue stepping through the code
21:43 Moment of realisation: Usually you want to move to the next Pixel when you write one
22:13 Quickly check the maths
22:52 Blackboard: Nz should be Pythagorean theorem solved
24:39 Calculate Nz
25:11 Set the Normal and look at how the Pixels are packed
26:28 Step through the code
26:52 Blackboard: Dealing with the area outside the sphere
27:35 Introduce RootTerm
29:05 Check the values of the Normal
29:55 Take a look at it in-game and find some erroneously negative values
31:40 Owl of Shame Moment: Yesterday's code was awful
32:14 View the correct NormalMap
32:48 Recalculate Texel.rgb such that it is within the valid range of colours
34:23 Turn off the NormalMap and consider using something more defined than the tree bitmap
34:55 Temporarily draw TreeNormal as if it was a texture map
36:02 Set the Pitch correctly and introduce BilinearSample function
39:07 Check it out in-game and switch to the path in which the NormalMap modulates the texture
39:49 Light the texture with the NormalMap
41:22 Take a look at it in-game
41:48 Tackle the environment_map stuff
45:24 Blackboard: Picking from the environment map
47:51 Nullify the Middle sample and make SampleEnvironmentMap produce values we can use
55:33 Look forward to next week
56:28 Q&A
57:42 Recap today's cleaning up
58:21 pseudonym73 Q: When you lerp two normals, you probably won't get a normalised vector. There are a few things you can do about that. Would you briefly comment on your thoughts about this?
1:01:41 @chronaldragon Q: how are we going to sample lights when calculating the pixel values for each sprite? Will there be a list of all the lights? Or will that be a parameter of some sort?
1:02:10 ingenero Q: What ever happened to your almond milk?
1:02:27 insofaras Q: Will Yangtian be making normal maps for the art now too?
1:02:51 andsz_ Q: Will you cover more advanced BRDFs? Or just simple phong-like lighting equations?
1:04:48 panic00 Q: What if I don't want my game to be just 'normal'? Are there any other kinds of maps I can use to make my game more unique?
1:06:25 @chronaldragon Q: Some games use a 'bump-map' in addition or instead of a normal map. What is the difference between these and what are the advantages or disadvantages?
1:07:12 Blackboard: Bump Map vs Normal Map
1:12:37 gasto5 Q; Will the effect end up like a bump map effect?
1:12:54 deadvertex Q: Could we do reflections by using our frame buffer as an environment map when drawing the bitmap?
1:13:17 pseudonym73 Q: If you imagine the surface as an implicit function f(x,y,z) = 0, it's the gradient of THAT function. Which is the same as the cross product of the two surface tangents.
1:14:44 We have come to the end of the questions

Normal Map Code Cleanup

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