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Fix errors in tutorial for specular lighting

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Also minor fix to file name
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Hugo Woodiwiss 2021-07-18 20:36:11 +01:00
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1 changed files with 3 additions and 3 deletions
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docs/intermediate/tutorial10-lighting/README.md
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@ -517,7 +517,7 @@ Remember the normal vectors that were included with our model? We're finally goi
If the dot product of the normal and light vector is 1.0, that means that the current fragment is directly inline with the light source and will receive the lights full intensity. A value of 0.0 or lower means that the surface is perpendicular or facing away from the light, and therefore will be dark. If the dot product of the normal and light vector is 1.0, that means that the current fragment is directly inline with the light source and will receive the lights full intensity. A value of 0.0 or lower means that the surface is perpendicular or facing away from the light, and therefore will be dark.
We're going to need to pull in the normal vector into our `shader.vert`. We're going to need to pull in the normal vector into our `shader.wgsl`.
```wgsl ```wgsl
struct VertexInput { struct VertexInput {
@ -847,8 +847,8 @@ let reflect_dir = reflect(-light_dir, in.world_normal);
Then we use the dot product to calculate the `specular_strength` and use that to compute the `specular_color`. Then we use the dot product to calculate the `specular_strength` and use that to compute the `specular_color`.
```wgsl ```wgsl
let specular_strength = pow(max(dot(view_dir, reflect_dir), 0.0), 32); let specular_strength = pow(max(dot(view_dir, reflect_dir), 0.0), 32.0);
let specular_color = specular_strength * light_color; let specular_color = specular_strength * light.color;
``` ```
Finally we add that to the result. Finally we add that to the result.