83 lines
2.4 KiB
Plaintext
83 lines
2.4 KiB
Plaintext
{
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"name": "perlin",
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"node_position": {
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"x": 0,
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"y": 0
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},
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"parameters": {
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"iterations": 3,
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"persistence": 0.5,
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"scale_x": 4,
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"scale_y": 4
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},
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"shader_model": {
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"code": "",
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"global": "float perlin(vec2 uv, vec2 size, int iterations, float persistence, int seed) {\n\tvec2 seed2 = rand2(vec2(float(seed), 1.0-float(seed)));\n float rv = 0.0;\n float coef = 1.0;\n float acc = 0.0;\n for (int i = 0; i < iterations; ++i) {\n \tvec2 step = vec2(1.0)/size;\n\t\tvec2 xy = floor(uv*size);\n float f0 = rand(seed2+mod(xy, size));\n float f1 = rand(seed2+mod(xy+vec2(1.0, 0.0), size));\n float f2 = rand(seed2+mod(xy+vec2(0.0, 1.0), size));\n float f3 = rand(seed2+mod(xy+vec2(1.0, 1.0), size));\n vec2 mixval = smoothstep(0.0, 1.0, fract(uv*size));\n rv += coef * mix(mix(f0, f1, mixval.x), mix(f2, f3, mixval.x), mixval.y);\n acc += coef;\n size *= 2.0;\n coef *= persistence;\n }\n \n return rv / acc;\n}\n",
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"inputs": [
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],
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"instance": "",
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"longdesc": "Generates several octaves of greyscale value noise",
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"name": "Value Noise",
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"outputs": [
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{
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"f": "perlin($(uv), vec2($(scale_x), $(scale_y)), int($(iterations)), $(persistence), $(seed))",
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"longdesc": "Shows a greyscale value noise",
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"shortdesc": "Output",
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"type": "f"
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}
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],
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"parameters": [
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{
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"control": "None",
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"default": 4,
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"label": "Scale X",
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"longdesc": "The scale along the X axis",
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"max": 32,
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"min": 1,
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"name": "scale_x",
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"shortdesc": "Scale.x",
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"step": 1,
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"type": "float"
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},
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{
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"control": "None",
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"default": 4,
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"label": "Scale Y",
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"longdesc": "The scale along the Y axis",
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"max": 32,
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"min": 1,
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"name": "scale_y",
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"shortdesc": "Scale.y",
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"step": 1,
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"type": "float"
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},
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{
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"control": "None",
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"default": 3,
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"label": "Iterations",
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"longdesc": "The number of octaves (higher values might affect performance)",
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"max": 10,
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"min": 1,
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"name": "iterations",
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"shortdesc": "Octaves",
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"step": 1,
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"type": "float"
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},
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{
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"control": "None",
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"default": 0.5,
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"label": "Persistence",
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"longdesc": "The persistence between two consecutive octaves",
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"max": 1,
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"min": 0,
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"name": "persistence",
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"shortdesc": "Persistence",
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"step": 0.05,
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"type": "float"
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}
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],
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"shortdesc": "Value Noise"
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},
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"type": "shader"
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} |