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Merge pull request #648 from williamchange/add-shard-fbm
Add shard fbm noise node
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,190 @@ | ||
| { | ||
| "name": "shard_fbm", | ||
| "node_position": { | ||
| "x": 0, | ||
| "y": 0 | ||
| }, | ||
| "parameters": { | ||
| "folds": 0, | ||
| "iter": 4, | ||
| "off": 0, | ||
| "per": 0.5, | ||
| "sharp": 0.7, | ||
| "sx": 7, | ||
| "sy": 7 | ||
| }, | ||
| "seed_int": 0, | ||
| "shader_model": { | ||
| "code": "", | ||
| "global": [ | ||
| "// Adapted from https://www.shadertoy.com/view/dlKyWw by @ENDESGA", | ||
| "", | ||
| "vec3 hash(vec3 p)", | ||
| "{", | ||
| "\tp = vec3(dot(p, vec3(127.1, 311.7, 74.7)), dot(p, vec3(269.5,183.3,246.1)), dot(p, vec3(113.5, 271.9, 124.6)));", | ||
| "\tp = fract(sin(p) * 43758.5453123);", | ||
| "\treturn p;", | ||
| "}", | ||
| "", | ||
| "float shard_noise(vec3 p, vec3 size, float sharpness, float seed) {", | ||
| "\tvec3 ip = floor(p);", | ||
| "\tvec3 fp = fract(p);", | ||
| "", | ||
| "\tfloat v = 0.0, t = 0.0;", | ||
| "\t", | ||
| "\tfor (int z = -1; z <= 1; z++) {", | ||
| "\t\tfor (int y = -2; y <= 2; y++) {", | ||
| "\t\t\tfor (int x = -2; x <= 2; x++) {", | ||
| "\t\t\t", | ||
| "\t\t\t\tvec3 o = vec3(float(x), float(y), float(z));", | ||
| "\t\t\t\tvec3 io = mod(ip + o, size);", | ||
| "\t\t\t\tvec3 h = hash(io + seed);", | ||
| "\t\t\t\tvec3 r = fp - (o + h);", | ||
| "", | ||
| "\t\t\t\tfloat w = exp2(-6.283185*dot(r, r));", | ||
| "\t\t\t\t// tanh deconstruction and optimization by @Xor", | ||
| "\t\t\t\tfloat s = sharpness * dot(r, hash(io + vec3(11, 31, 47)) - 0.5);", | ||
| "\t\t\t\tv += w * s*inversesqrt(1.0+s*s);", | ||
| "\t\t\t\tt += w;", | ||
| "\t\t\t}", | ||
| "\t\t}", | ||
| "\t}", | ||
| "\treturn ((v / t) * 0.5) + 0.5;", | ||
| "}", | ||
| "", | ||
| "float fbm_shard(vec3 coord, vec3 size, int folds, int octaves, float persistence, float sharpness, float seed) {", | ||
| "\tfloat normalize_factor = 0.0;", | ||
| "\tfloat value = 0.0;", | ||
| "\tfloat scale = 1.0;", | ||
| "\tfor (int i = 0; i < octaves; i++) {", | ||
| "\t\tfloat noise = shard_noise(coord*size, size, sharpness, seed);", | ||
| "\t\tfor (int f = 0; f < folds; ++f) {", | ||
| "\t\t\tnoise = abs(2.0*noise-1.0);", | ||
| "\t\t}", | ||
| "\t\tvalue += noise * scale;", | ||
| "\t\tnormalize_factor += scale;", | ||
| "\t\tsize *= 2.0;", | ||
| "\t\tscale *= persistence;", | ||
| "\t}", | ||
| "\treturn value / normalize_factor;", | ||
| "}" | ||
| ], | ||
| "inputs": [ | ||
| { | ||
| "default": "$sharp", | ||
| "label": "1:", | ||
| "longdesc": "Map that affects the sharpness parameter", | ||
| "name": "sharp_in", | ||
| "shortdesc": "Sharpness Map", | ||
| "type": "f" | ||
| }, | ||
| { | ||
| "default": "$off", | ||
| "label": "7:", | ||
| "longdesc": "An optional input to drive the offset", | ||
| "name": "offset_in", | ||
| "shortdesc": "Offset Input", | ||
| "type": "f" | ||
| } | ||
| ], | ||
| "instance": "", | ||
| "longdesc": "Generates noise made of several octaves of shard noise", | ||
| "name": "Shard FBM Noise", | ||
| "outputs": [ | ||
| { | ||
| "f": "fbm_shard(vec3($uv,$offset_in($uv)),vec3($sx,$sy,1.0),int($folds),int($iter),$per,pow(2,$sharp_in($uv)*$sharp*8.0),$seed)", | ||
| "longdesc": "Greyscale image of the generated noise", | ||
| "shortdesc": "Output", | ||
| "type": "f" | ||
| } | ||
| ], | ||
| "parameters": [ | ||
| { | ||
| "control": "None", | ||
| "default": 0.7, | ||
| "label": "Sharpness", | ||
| "longdesc": "Sharpness of the noise", | ||
| "max": 1, | ||
| "min": 0, | ||
| "name": "sharp", | ||
| "shortdesc": "Sharpness", | ||
| "step": 0.01, | ||
| "type": "float" | ||
| }, | ||
| { | ||
| "control": "None", | ||
| "default": 7, | ||
| "label": "Scale X", | ||
| "longdesc": "Scale of the first octave along the X axis", | ||
| "max": 32, | ||
| "min": 1, | ||
| "name": "sx", | ||
| "shortdesc": "Scale.x", | ||
| "step": 1, | ||
| "type": "float" | ||
| }, | ||
| { | ||
| "control": "None", | ||
| "default": 7, | ||
| "label": "Scale Y", | ||
| "longdesc": "Scale of the first octave along the Y axis", | ||
| "max": 32, | ||
| "min": 1, | ||
| "name": "sy", | ||
| "shortdesc": "Scale.y", | ||
| "step": 1, | ||
| "type": "float" | ||
| }, | ||
| { | ||
| "control": "None", | ||
| "default": 0, | ||
| "label": "Folds", | ||
| "longdesc": "Number of times the noise is folded", | ||
| "max": 5, | ||
| "min": 0, | ||
| "name": "folds", | ||
| "shortdesc": "Folds", | ||
| "step": 1, | ||
| "type": "float" | ||
| }, | ||
| { | ||
| "control": "None", | ||
| "default": 4, | ||
| "label": "Iterations", | ||
| "longdesc": "Number of noise octaves", | ||
| "max": 8, | ||
| "min": 1, | ||
| "name": "iter", | ||
| "shortdesc": "Octaves", | ||
| "step": 1, | ||
| "type": "float" | ||
| }, | ||
| { | ||
| "control": "None", | ||
| "default": 0.5, | ||
| "label": "Persistence", | ||
| "longdesc": "Persistence between two consecutive octaves", | ||
| "max": 1, | ||
| "min": 0, | ||
| "name": "per", | ||
| "shortdesc": "Persistence", | ||
| "step": 0.01, | ||
| "type": "float" | ||
| }, | ||
| { | ||
| "control": "None", | ||
| "default": 0, | ||
| "label": "Offset", | ||
| "longdesc": "Offsets the points of the noise, can be used to animate the noise with \"$time\"", | ||
| "max": 1, | ||
| "min": 0, | ||
| "name": "off", | ||
| "shortdesc": "Offset", | ||
| "step": 0.01, | ||
| "type": "float" | ||
| } | ||
| ], | ||
| "shortdesc": "Fractional Brownian Motion Noise" | ||
| }, | ||
| "type": "shader" | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,37 @@ | ||
| Shard FBM Noise node | ||
| ~~~~~~~~~~~~~~~~~~~~ | ||
|
|
||
| The **Shard FBM Noise** node outputs a fractional Brownian motion texture. | ||
| FBM is obtained by repeating a noise pattern with smaller and smaller details. | ||
|
|
||
| .. image:: images/node_noise_shard_fbm.png | ||
| :align: center | ||
|
|
||
| Inputs | ||
| ++++++ | ||
|
|
||
| The **Shard FBM Noise** node accepts two inputs, the **Offset Input** to optionally | ||
| drive the **Offset** value with an input and a **Sharpness Map** which affects the sharpness parameter. | ||
|
|
||
| Outputs | ||
| +++++++ | ||
|
|
||
| The **Shard FBM Noise** node provides a greyscale noise texture. | ||
|
|
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| Parameters | ||
| ++++++++++ | ||
|
|
||
| The Shard FBM Noise node accepts the following parameters: | ||
|
|
||
| * *Sharpness* of the noise | ||
| * *X* and *Y* scale of the first octave noise | ||
| * Number of *Folds* (offsetting the noise negatively and taking the absolute value) | ||
| * Number of *Iterations* | ||
| * *Persistance*, i.e. the strength of each subsequent iteration | ||
| * *Offset* of the points, can be used to animate the noise | ||
|
|
||
| Example images | ||
| ++++++++++++++ | ||
|
|
||
| .. image:: images/node_noise_shard_fbm_sample.png | ||
| :align: center |
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