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62 lines
2.1 KiB
Plaintext
62 lines
2.1 KiB
Plaintext
shader_type spatial;
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render_mode cull_disabled;
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//uniform int _ShellIndex; // index of shell being worked on (0 -> _ShellCount)
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uniform float _NoiseMin; // minimum strand length
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uniform float _NoiseMax; // maxmimum strand length
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uniform float _ShellLength; // amount of distance that the shells cover, 1 means shells will span across 1 world space unit
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uniform int _ShellCount; // total number of shells (for normalizing the shell index)
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uniform float _ShellDistanceAttenuation; // exponent how far to push the shell outwards
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uniform float _Thickness; // how thick a strand shall be
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uniform float _Attenuation; // AO strength factor
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uniform float _OcclusionBias; // additive bias for AO
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uniform vec3 _ShellColor;
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uniform float _Density; // amout of strands to generate
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varying flat int _ShellIndex;
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float hash(uint n) {
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n = (n << 13U) ^ n;
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n = n * (n * n * 15731U + 1239221U) + 123376312589U;
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return float(n & uint(0x7fffffffU)) / float(0x7fffffff);
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}
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void vertex() {
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_ShellIndex = int(INSTANCE_CUSTOM.x);
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float shell_height = float(_ShellIndex) / float(_ShellCount);
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shell_height = pow(shell_height, _ShellDistanceAttenuation);
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VERTEX.xyz += NORMAL.xyz * _ShellLength * shell_height;
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//NORMAL = normalize(NORMAL);
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UV = UV;
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}
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void fragment() {
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vec2 newUV = UV * _Density;
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vec2 localUV = fract(newUV) * 2. - 1.;
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float localDistanceFromCenter = length(localUV);
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float h = float(_ShellIndex) / float(_ShellCount); // normalized height
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uint seed = uint(int(newUV.x) + 100 * int(newUV.y) + 100 * 10);
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float rand = mix(_NoiseMin, _NoiseMax, hash(seed)); // getting random value for strand
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if (localDistanceFromCenter > _Thickness * (rand - h) && _ShellIndex > 0) discard; // discarding pixels outside of thickness
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//float ndotl = dot(NORMAL, WORLD) // TODO do light later?
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float ambientOcclusion = pow(h, _Attenuation); // fake Ambient Occlusion
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ambientOcclusion += _OcclusionBias;
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// Called for every pixel the material is visible on.
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ALBEDO.rgb = _ShellColor * ambientOcclusion;
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//ALPHA = 1.0;
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}
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void light() {
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float ndotl = clamp(dot(NORMAL, LIGHT), 0., 1.) * .5 + .5;
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DIFFUSE_LIGHT += ndotl * ndotl;
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}
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