//This file is automatically rebuilt by the Cesium build process.
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export default "uniform vec3 u_noiseTextureDimensions;\n\
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uniform float u_noiseDetail;\n\
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uniform vec3 u_noiseOffset;\n\
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varying vec2 v_position;\n\
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\n\
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float textureSliceWidth = u_noiseTextureDimensions.x;\n\
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float inverseNoiseTextureRows = u_noiseTextureDimensions.z;\n\
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\n\
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float wrap(float value, float rangeLength) {\n\
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if(value < 0.0) {\n\
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float absValue = abs(value);\n\
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float modValue = mod(absValue, rangeLength);\n\
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return mod(rangeLength - modValue, rangeLength);\n\
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}\n\
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return mod(value, rangeLength);\n\
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}\n\
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\n\
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vec3 wrapVec(vec3 value, float rangeLength) {\n\
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return vec3(wrap(value.x, rangeLength),\n\
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wrap(value.y, rangeLength),\n\
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wrap(value.z, rangeLength));\n\
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}\n\
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\n\
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vec3 random3(vec3 p) {\n\
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float dot1 = dot(p, vec3(127.1, 311.7, 932.8));\n\
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float dot2 = dot(p, vec3(269.5, 183.3, 421.4));\n\
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return fract(vec3(sin(dot1 - dot2), cos(dot1 * dot2), dot1 * dot2));\n\
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}\n\
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\n\
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// Frequency corresponds to cell size.\n\
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// The higher the frequency, the smaller the cell size.\n\
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vec3 getWorleyCellPoint(vec3 centerCell, vec3 offset, float freq) {\n\
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vec3 cell = centerCell + offset;\n\
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cell = wrapVec(cell, textureSliceWidth / u_noiseDetail);\n\
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cell += floor(u_noiseOffset / u_noiseDetail);\n\
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vec3 p = offset + random3(cell);\n\
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return p;\n\
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}\n\
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\n\
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float worleyNoise(vec3 p, float freq) {\n\
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vec3 centerCell = floor(p * freq);\n\
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vec3 pointInCell = fract(p * freq);\n\
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float shortestDistance = 1000.0;\n\
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\n\
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for(float z = -1.0; z <= 1.0; z++) {\n\
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for(float y = -1.0; y <= 1.0; y++) {\n\
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for(float x = -1.0; x <= 1.0; x++) {\n\
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vec3 offset = vec3(x, y, z);\n\
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vec3 point = getWorleyCellPoint(centerCell, offset, freq);\n\
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\n\
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float distance = length(pointInCell - point);\n\
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if(distance < shortestDistance) {\n\
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shortestDistance = distance;\n\
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}\n\
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}\n\
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}\n\
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}\n\
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\n\
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return shortestDistance;\n\
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}\n\
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\n\
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const float MAX_FBM_ITERATIONS = 10.0;\n\
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\n\
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float worleyFBMNoise(vec3 p, float octaves, float scale) {\n\
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float noise = 0.0;\n\
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float freq = 1.0;\n\
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float persistence = 0.625;\n\
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for(float i = 0.0; i < MAX_FBM_ITERATIONS; i++) {\n\
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if(i >= octaves) {\n\
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break;\n\
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}\n\
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\n\
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noise += worleyNoise(p * scale, freq * scale) * persistence;\n\
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persistence *= 0.5;\n\
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freq *= 2.0;\n\
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}\n\
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return noise;\n\
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}\n\
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\n\
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void main() {\n\
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float x = mod(v_position.x, textureSliceWidth);\n\
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float y = mod(v_position.y, textureSliceWidth);\n\
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float sliceRow = floor(v_position.y / textureSliceWidth);\n\
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float z = floor(v_position.x / textureSliceWidth) + sliceRow * inverseNoiseTextureRows * textureSliceWidth;\n\
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\n\
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vec3 position = vec3(x, y, z);\n\
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position /= u_noiseDetail;\n\
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float worley0 = clamp(worleyFBMNoise(position, 3.0, 1.0), 0.0, 1.0);\n\
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float worley1 = clamp(worleyFBMNoise(position, 3.0, 2.0), 0.0, 1.0);\n\
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float worley2 = clamp(worleyFBMNoise(position, 3.0, 3.0), 0.0, 1.0);\n\
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gl_FragColor = vec4(worley0, worley1, worley2, 1.0);\n\
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}\n\
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";
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