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Eevee / Workbench: Fix hair normals

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Hair normals were not behaving correctly. This corrects their looks and
fix the node shader geometry that was showing the flat normal.
This commit is contained in:
Clément Foucault
2019-05-17 18:17:14 +02:00
parent ec3940ab0a
commit 0c4ce8e55e
5 changed files with 10 additions and 13 deletions
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11
source/blender/draw/engines/workbench/shaders/workbench_prepass_vert.glsl
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@@ -46,12 +46,11 @@ vec3 srgb_to_linear_attr(vec3 c)
vec3 workbench_hair_hair_normal(vec3 tan, vec3 binor, float rand)
{
/* To "simulate" anisotropic shading, randomize hair normal per strand. */
tan = normalize(tan);
vec3 nor = normalize(cross(binor, tan));
// nor = normalize(mix(nor, -tan, rand * 0.1));
// float cos_theta = (rand * 2.0 - 1.0) * 0.2;
// float sin_theta = sqrt(max(0.0, 1.0 - cos_theta * cos_theta));
// nor = nor * sin_theta + binor * cos_theta;
vec3 nor = cross(tan, binor);
nor = normalize(mix(nor, -tan, rand * 0.1));
float cos_theta = (rand * 2.0 - 1.0) * 0.2;
float sin_theta = sqrt(max(0.0, 1.0 - cos_theta * cos_theta));
nor = nor * sin_theta + binor * cos_theta;
return nor;
}