然后把这段复制进去

vec4 finalCompositeCompiled = vec4(finalComposite, 1.0);
#ifdef CREPUSCULAR_RAYS
finalCompositeCompiled.a = CrepuscularRays(surface);
#endif
gl_FragData[0] = finalCompositeCompiled;
gl_FragData[1] = vec4(surface.mask.matIDs, surface.shadow * surface.cloudShadow * pow(mcLightmap.sky, 0.2f), mcLightmap.sky, 1.0);