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28 lines
972 B
Plaintext
28 lines
972 B
Plaintext
2 years ago
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// xs_begin
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// arg : { var = 'm_radius' name = 'Radius' value = '3' range = '1 128' step = '1' precision = '0' }
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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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vec3 center = i_volume_size * 0.5;
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vec3 p = ( v - center );
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if( length( vec2( length(p.xy) - min(center.x,center.y) + m_radius, p.z)) - m_radius > 0.5 ) {
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return 0.0;
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}
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float s = i_volume_size.x / float( i_num_color_sels );
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return color_sel( v.x / s );
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}
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