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#version 120
#define saturate(x) clamp(x,0.0,1.0)
#define lerp mix
#define BATCH_INSTANCES 64
#line 45
uniform sampler3D Noise;
uniform float fade;
varying vec3 texCoord;
varying vec3 normal;
varying vec3 lVec;
void main(){
vec3 lightVec = normalize(lVec);
vec3 viewVec = lightVec;
float atten = saturate(1.0 / (1.0 + dot(lVec, lVec)) - 0.1);
vec4 darkWood = vec4(0.09, 0.04, 0.01, 1.0);
vec4 liteWood = vec4(0.92, 0.51, 0.13, 1.0);
float rings = fract(texture3D(Noise, texCoord * 0.15, 1.0).x * 4.0);
rings *= 4.0 * (1.0 - rings);
rings *= rings;
float n = texture3D(Noise, texCoord).x;
vec4 base = lerp(darkWood, liteWood, rings + n);
float diffuse = saturate(dot(lightVec, normal));
float specular = pow(diffuse, 64.0);
gl_FragColor = fade * atten * ((diffuse * 0.8 + 0.2) * base + 0.4 * specular);
}
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