@doegis/core
Version:
DOE GIS API
16 lines (14 loc) • 847 B
JavaScript
import{glsl as e}from"../../shaderModules/interfaces.js";function t(t){const a=t.fragment.code;a.add(e`vec3 evaluateDiffuseIlluminationHemisphere(vec3 ambientGround, vec3 ambientSky, float NdotNG)
{
return ((1.0 - NdotNG) * ambientGround + (1.0 + NdotNG) * ambientSky) * 0.5;
}`),a.add(e`float integratedRadiance(float cosTheta2, float roughness)
{
return (cosTheta2 - 1.0) / (cosTheta2 * (1.0 - roughness * roughness) - 1.0);
}`),a.add(e`vec3 evaluateSpecularIlluminationHemisphere(vec3 ambientGround, vec3 ambientSky, float RdotNG, float roughness)
{
float cosTheta2 = 1.0 - RdotNG * RdotNG;
float intRadTheta = integratedRadiance(cosTheta2, roughness);
float ground = RdotNG < 0.0 ? 1.0 - intRadTheta : 1.0 + intRadTheta;
float sky = 2.0 - ground;
return (ground * ambientGround + sky * ambientSky) * 0.5;
}`)}export{t as AnalyticalSkyModel};