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21 lines
761 B
Plaintext
21 lines
761 B
Plaintext
2 years ago
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// xs_begin
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// author : 'ephtracy'
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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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const float PI = 3.1415926;
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v = ( v - i_volume_size * 0.5 ) / ( i_volume_size * 0.5 );
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return i_color_index * step( length( v ), 1.0 );
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}
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