k3d/share/shaders/k3d_volcube.sl:220:    float  cur_depth    = 0;
k3d/share/shaders/k3d_volcube.sl:244:		if(cur_depth > 0){
k3d/share/shaders/k3d_volcube.sl:248:		    Nf = fnc_normalMix(Nf,Vol_Nf,clamp(cur_depth/SurfNormalDepth,0,1));
k3d/share/shaders/k3d_volcube.sl:298:	cur_depth += StepSize;
