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fix: checking whether normal is facing the camera.

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This commit is contained in:
Wallbreaker5th 2021-06-05 17:33:54 +08:00
parent bb72718c3b
commit bb27a78449
1 changed files with 6 additions and 5 deletions
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11
manimlib/shaders/inserts/finalize_color.glsl
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@ -17,16 +17,17 @@ vec4 add_light(vec4 color,
float shadow){
if(gloss == 0.0 && shadow == 0.0) return color;
// TODO, do we actually want this? It effectively treats surfaces as two-sided
if(unit_normal.z < 0){
unit_normal *= -1;
}
// TODO, read this in as a uniform?
float camera_distance = 6;
// Assume everything has already been rotated such that camera is in the z-direction
vec3 to_camera = vec3(0, 0, camera_distance) - point;
vec3 to_light = light_coords - point;
// TODO, do we actually want this? It effectively treats surfaces as two-sided
if(dot(to_camera,unit_normal) < 0){
unit_normal *= -1;
}
vec3 light_reflection = -to_light + 2 * unit_normal * dot(to_light, unit_normal);
float dot_prod = dot(normalize(light_reflection), normalize(to_camera));
float shine = gloss * exp(-3 * pow(1 - dot_prod, 2));