You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
25 lines
983 B
Plaintext
25 lines
983 B
Plaintext
2 years ago
|
// xs_begin
|
||
|
|
// src : 'https://www.iquilezles.org/www/articles/distfunctions/distfunctions.htm'
|
||
|
|
// arg : { var = 'm_radius' name = 'Radius' value = '5' range = '0 64' step = '0.1' precision = '1' }
|
||
|
|
// xs_end
|
||
|
|
|
||
|
|
//===== built-in args =====
|
||
|
|
// uniform vec3 i_volume_size; // volume size [1-256]
|
||
|
|
// uniform float i_color_index; // current color index [0-255]
|
||
|
|
// uniform int i_num_color_sels; // number of color selections [1-255]
|
||
|
|
|
||
|
|
//===== built-in functions =====
|
||
|
|
// float voxel( vec3 v ); // get voxel color index
|
||
|
|
// float color_sel( float k ); // get kth selected color index
|
||
|
|
// vec4 palette( float index ); // get palette color
|
||
|
|
|
||
|
|
// 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 ) )
|
||
|
|
float map( vec3 v ) {
|
||
|
|
v -= i_volume_size * 0.5;
|
||
|
|
vec3 q = abs(v) - i_volume_size * 0.5 + m_radius;
|
||
|
|
if ( length(max(q,0.0)) + min(max(q.x,max(q.y,q.z)),0.0) < m_radius ) {
|
||
|
|
return i_color_index;
|
||
|
|
}
|
||
|
|
return 0.0;
|
||
|
|
}
|