playcanvas

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Open-source WebGL/WebGPU 3D engine for the web

28 lines (26 loc) • 753 B

JavaScript

var fresnelSchlickPS = `
vec3 getFresnel(
		float cosTheta, 
		float gloss, 
		vec3 specularity
#if defined(LIT_IRIDESCENCE)
		, vec3 iridescenceFresnel, 
		float iridescenceIntensity
#endif
	) {
	float fresnel = pow(1.0 - saturate(cosTheta), 5.0);
	float glossSq = gloss * gloss;
	float specIntensity = max(specularity.r, max(specularity.g, specularity.b));
	vec3 ret = specularity + (max(vec3(glossSq * specIntensity), specularity) - specularity) * fresnel;
#if defined(LIT_IRIDESCENCE)
	return mix(ret, iridescenceFresnel, iridescenceIntensity);
#else
	return ret;
#endif	
}
float getFresnelCC(float cosTheta) {
	float fresnel = pow(1.0 - saturate(cosTheta), 5.0);
	return 0.04 + (1.0 - 0.04) * fresnel;
}
`;

export { fresnelSchlickPS as default };