$mol_3d_sdf - signed distance field functions library

3d/sdf/sdf.glsl

@@ -0,0 +1,50 @@
+// min##   = union
+// max##   = joint
+// -#      = inverse
+// #+#     = scale
+
+float mol_3d_sdf_joint( float a, float b ) {
+  return max( a, b );
+}
+float mol_3d_sdf_joint( float a, float b, float c ) {
+  return max( max( a, b ), c );
+}
+float mol_3d_sdf_joint( float a, float b, float c, float d ) {
+  return max( max( a, b ), max( c, d ) );
+}
+float mol_3d_sdf_joint( vec3 point ) {
+  return mol_3d_sdf_joint( point.x, point.y, point.z );
+}
+
+float mol_3d_sdf_union( float a, float b ) {
+  return min( a, b );
+}
+float mol_3d_sdf_union( float a, float b, float c ) {
+  return min( min( a, b ), c );
+}
+float mol_3d_sdf_union( float a, float b, float c, float d ) {
+  return min( min( a, b ), min( c, d ) );
+}
+float mol_3d_sdf_union( vec3 point ) {
+  return mol_3d_sdf_union( point.x, point.y, point.z );
+}
+
+float mol_3d_sdf_union_smooth( float d1, float d2, float k ) {
+    float h = clamp( 0.5 + 0.5*(d2-d1)/k, 0.0, 1.0 );
+    return mix( d2, d1, h ) - k*h*(1.0-h);
+}
+
+float mol_3d_sdf_sphere( vec3 point, float size ) {
+  return length(point) - size;
+}
+
+float mol_3d_sdf_plane( vec3 point, vec3 normal ) {
+  return dot( point, normal );
+}
+
+float mol_3d_sdf_box( vec3 point, vec3 size, float round ) {
+	vec3 d = abs(point) - size + round;
+	return min( mol_3d_sdf_joint( d ), 0.0 )
+		+ length( max( d, 0.0 ) )
+		- round;
+}