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31 lines
1.2 KiB
Plaintext
31 lines
1.2 KiB
Plaintext
// xs_begin
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// author : '@mode_vis'
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// arg : { var = 'm_teeth' name = 'Teeth' value = '6' range = '3 64' step = '1' precision = '0' }
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// arg : { var = 'm_inner' name = 'Inner' value = '0.5' range = '0.0 1.0' step = '0.05' precision = '2' }
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// xs_end
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//===== built-in args =====
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// uniform vec3 i_volume_size; // volume size [1-256]
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// uniform float i_color_index; // current color index [0-255]
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// uniform int i_num_color_sels; // number of color selections [1-255]
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//===== built-in functions =====
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// float voxel( vec3 v ); // get voxel color index
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// float color_sel( float k ); // get kth selected color index
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// vec4 palette( float index ); // get palette color
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// generate a new voxel color index [0, 255] at position v ( v is at the center of voxel, such as vec3( 1.5, 2.5, 4.5 ) )
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float map( vec3 v ) {
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float evo = 1.0;
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vec3 center = i_volume_size * 0.5;
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vec3 p = (v-center);
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p.z = 1.0;
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float r = 0.12*min(i_volume_size.x,i_volume_size.y);
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float R = length(p);
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float a = atan(p.y,p.x);
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float f = smoothstep(-.5, evo, cos(a * m_teeth)) * r + r * 3.0;
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float d = step(r*4.*m_inner,R);
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float col = d * vec3( 1.-step(f,R)) ;
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return col* i_color_index;
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} |