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SimpleNoise algorithm improved

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Digvijaysinh Gohil 2023-10-13 17:00:44 +05:30
parent e2c630daae
commit ccf5ddd609
1 changed files with 19 additions and 15 deletions
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34
addons/ShaderLib/Procedural/Noise/SimpleNoise.gdshaderinc
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@ -2,27 +2,31 @@ float noise_random_value(vec2 uv){
return fract(sin(dot(uv.xy, vec2(12.9898,78.233))) * 43758.5453123);
}
float value_noise(vec2 uv) {
vec2 uv_index = floor(uv);
vec2 uv_fract = fract(uv);
float a = noise_random_value(uv_index);
float b = noise_random_value(uv_index + vec2(1.0, 0.0));
float c = noise_random_value(uv_index + vec2(0.0, 1.0));
float d = noise_random_value(uv_index + vec2(1.0, 1.0));
vec2 blur = smoothstep(0.0, 1.0, uv_fract);
return mix(a, b, blur.x) + ((c - a) * blur.y * (1.0 - blur.x)) + ((d - b) * blur.x * blur.y);
float value_noise(vec2 uv){
vec2 _floor = floor(uv);
vec2 _fraction = fract(uv);
_fraction = _fraction * _fraction * (3.0 - 2.0 * _fraction);
vec2 _corner = vec2(1.0, 0.0);
float _c0 = noise_random_value(_floor + _corner.yy);
float _c1 = noise_random_value(_floor + _corner.xy);
float _c2 = noise_random_value(_floor + _corner.yx);
float _c3 = noise_random_value(_floor + _corner.xx);
vec2 _blur = smoothstep(0.0, 1.0, _fraction);
float mix_one = mix(_c0, _c1, _blur.x) + (_c2 - _c0) * _blur.y * (1.0 - _blur.x) + (_c3 - _c1) * _blur.x * _blur.y;
return mix_one;
}
float simple_noise(vec2 uv, float scale){
int octaves = 6;
float amplitude = 0.5;
float frequency = scale;
float amplitude = 0.25;
float value = 0.0;
for(int i = 0; i < octaves; i++) {
value += amplitude * value_noise(frequency * uv);
amplitude *= 0.5;
frequency *= 2.0;
value += amplitude * value_noise(scale * uv);
amplitude *= 0.85;
scale *= 3.0;
}
return value;
}