mirror of
https://github.com/Relintai/material-maker.git
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92 lines
3.5 KiB
Plaintext
92 lines
3.5 KiB
Plaintext
{
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"name": "fbm",
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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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"noise": 0,
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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 fbm_value(vec2 coord, vec2 size, float seed) {\n\tvec2 o = floor(coord)+rand2(vec2(float(seed), 1.0-float(seed)))+size;\n\tvec2 f = fract(coord);\n\tfloat p00 = rand(mod(o, size));\n\tfloat p01 = rand(mod(o + vec2(0.0, 1.0), size));\n\tfloat p10 = rand(mod(o + vec2(1.0, 0.0), size));\n\tfloat p11 = rand(mod(o + vec2(1.0, 1.0), size));\n\tvec2 t = f * f * (3.0 - 2.0 * f);\n\treturn mix(mix(p00, p10, t.x), mix(p01, p11, t.x), t.y);\n}\n\nfloat fbm_perlin(vec2 coord, vec2 size, float seed) {\n\tvec2 o = floor(coord)+rand2(vec2(float(seed), 1.0-float(seed)))+size;\n\tvec2 f = fract(coord);\n\tfloat a00 = rand(mod(o, size)) * 6.28318530718;\n\tfloat a01 = rand(mod(o + vec2(0.0, 1.0), size)) * 6.28318530718;\n\tfloat a10 = rand(mod(o + vec2(1.0, 0.0), size)) * 6.28318530718;\n\tfloat a11 = rand(mod(o + vec2(1.0, 1.0), size)) * 6.28318530718;\n\tvec2 v00 = vec2(cos(a00), sin(a00));\n\tvec2 v01 = vec2(cos(a01), sin(a01));\n\tvec2 v10 = vec2(cos(a10), sin(a10));\n\tvec2 v11 = vec2(cos(a11), sin(a11));\n\tfloat p00 = dot(v00, f);\n\tfloat p01 = dot(v01, f - vec2(0.0, 1.0));\n\tfloat p10 = dot(v10, f - vec2(1.0, 0.0));\n\tfloat p11 = dot(v11, f - vec2(1.0, 1.0));\n\tvec2 t = f * f * (3.0 - 2.0 * f);\n\treturn 0.5 + mix(mix(p00, p10, t.x), mix(p01, p11, t.x), t.y);\n}\n\nfloat fbm_cellular(vec2 coord, vec2 size, float seed) {\n\tvec2 o = floor(coord)+rand2(vec2(float(seed), 1.0-float(seed)))+size;\n\tvec2 f = fract(coord);\n\tfloat min_dist = 2.0;\n\tfor(float x = -1.0; x <= 1.0; x++) {\n\t\tfor(float y = -1.0; y <= 1.0; y++) {\n\t\t\tvec2 node = rand2(mod(o + vec2(x, y), size)) + vec2(x, y);\n\t\t\tfloat dist = sqrt((f - node).x * (f - node).x + (f - node).y * (f - node).y);\n\t\t\tmin_dist = min(min_dist, dist);\n\t\t}\n\t}\n\treturn min_dist;\n}\n",
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"inputs": [
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],
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"instance": "float $(name)_fbm(vec2 coord, vec2 size, int octaves, float persistence, float seed) {\n\tfloat normalize_factor = 0.0;\n\tfloat value = 0.0;\n\tfloat scale = 1.0;\n\tfor (int i = 0; i < octaves; i++) {\n\t\tvalue += fbm_$noise(coord*size, size, seed) * scale;\n\t\tnormalize_factor += scale;\n\t\tsize *= 2.0;\n\t\tscale *= persistence;\n\t}\n\treturn value / normalize_factor;\n}\n",
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"name": "FBM",
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"outputs": [
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{
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"f": "$(name)_fbm($(uv), vec2($(scale_x), $(scale_y)), int($(iterations)), $(persistence), $(seed))",
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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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"default": 2,
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"label": "Noise",
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"name": "noise",
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"type": "enum",
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"values": [
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{
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"name": "Value",
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"value": "value"
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},
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{
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"name": "Perlin",
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"value": "perlin"
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},
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{
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"name": "Cellular",
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"value": "cellular"
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}
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]
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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 X",
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"max": 32,
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"min": 1,
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"name": "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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"max": 32,
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"min": 1,
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"name": "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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"max": 10,
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"min": 1,
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"name": "iterations",
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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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"max": 1,
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"min": 0,
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"name": "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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},
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"type": "shader"
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} |