Variable volumetricSpotlightFragmentShaderConst
volumetricSpotlightFragmentShader: "\n uniform float uTime;\n uniform vec3 uLightColor;\n uniform float uIntensity;\n uniform float uAngle;\n uniform float uPenumbra;\n uniform float uDistance;\n uniform float uDustDensity;\n uniform vec3 uLightPosition;\n uniform vec3 uLightDirection;\n \n varying vec3 vWorldPosition;\n varying vec3 vNormal;\n varying vec3 vViewDirection;\n \n float hash(vec3 p) {\n p = fract(p * vec3(443.897, 441.423, 437.195));\n p += dot(p, p.yxz + 19.19);\n return fract((p.x + p.y) * p.z);\n }\n \n float noise(vec3 p) {\n vec3 i = floor(p);\n vec3 f = fract(p);\n f = f * f * (3.0 - 2.0 * f);\n \n return mix(\n mix(mix(hash(i), hash(i + vec3(1,0,0)), f.x),\n mix(hash(i + vec3(0,1,0)), hash(i + vec3(1,1,0)), f.x), f.y),\n mix(mix(hash(i + vec3(0,0,1)), hash(i + vec3(1,0,1)), f.x),\n mix(hash(i + vec3(0,1,1)), hash(i + vec3(1,1,1)), f.x), f.y),\n f.z\n );\n }\n \n void main() {\n vec3 toLight = uLightPosition - vWorldPosition;\n float dist = length(toLight);\n vec3 lightDir = normalize(toLight);\n \n float cosAngle = dot(-lightDir, normalize(uLightDirection));\n float spotEffect = smoothstep(cos(uAngle + uPenumbra), cos(uAngle), cosAngle);\n \n float distAttenuation = 1.0 - smoothstep(0.0, uDistance, dist);\n \n float dust = noise(vWorldPosition * 2.0 + vec3(uTime * 0.1, uTime * 0.05, uTime * 0.08));\n dust = 0.3 + 0.7 * dust;\n dust *= uDustDensity;\n \n float edgeFade = 1.0 - abs(dot(vNormal, vViewDirection));\n edgeFade = pow(edgeFade, 2.0);\n \n float alpha = spotEffect * distAttenuation * dust * uIntensity * edgeFade;\n alpha = clamp(alpha, 0.0, 0.8);\n \n gl_FragColor = vec4(uLightColor, alpha);\n }\n" = ...