playcanvas/build/playcanvas/src/scene/shader-lib/glsl/chunks/lit/frag/reflDirAniso.js

PlayCanvas WebGL game engine

var reflDirAnisoPS = `
void getReflDir(vec3 worldNormal, vec3 viewDir, float gloss, mat3 tbn) {
	float roughness = sqrt(1.0 - min(gloss, 1.0));
	vec2 direction = dAnisotropyRotation;
	vec3 anisotropicT = normalize(tbn * vec3(direction, 0.0));
	vec3 anisotropicB = normalize(cross(tbn[2], anisotropicT));
	float anisotropy = dAnisotropy;
	vec3 anisotropicDirection = anisotropicB;
	vec3 anisotropicTangent = cross(anisotropicDirection, viewDir);
	vec3 anisotropicNormal = cross(anisotropicTangent, anisotropicDirection);
	float bendFactor = 1.0 - anisotropy * (1.0 - roughness);
	float bendFactor4 = bendFactor * bendFactor * bendFactor * bendFactor;
	vec3 bentNormal = normalize(mix(normalize(anisotropicNormal), normalize(worldNormal), bendFactor4));
	dReflDirW = reflect(-viewDir, bentNormal);
}
`;

export { reflDirAnisoPS as default };