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25 lines
983 B
Plaintext
25 lines
983 B
Plaintext
// xs_begin
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// src : 'https://www.iquilezles.org/www/articles/distfunctions/distfunctions.htm'
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// arg : { var = 'm_radius' name = 'Radius' value = '5' range = '0 64' step = '0.1' precision = '1' }
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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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v -= i_volume_size * 0.5;
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vec3 q = abs(v) - i_volume_size * 0.5 + m_radius;
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if ( length(max(q,0.0)) + min(max(q.x,max(q.y,q.z)),0.0) < m_radius ) {
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return i_color_index;
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}
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return 0.0;
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}
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