k3d/share/shaders/k3d_volcube.sl:212:    float  density_sum  = 0;
k3d/share/shaders/k3d_volcube.sl:229:    while(curStep < numOfSteps && density_sum < 1){
k3d/share/shaders/k3d_volcube.sl:266:		density_sum += max(0,cur_density);
k3d/share/shaders/k3d_volcube.sl:273:		color_sum = ( cur_color) * (1-density_sum) + color_sum;
k3d/share/shaders/k3d_volcube.sl:274:		density_sum = (cur_density) * (1-density_sum) + density_sum;
k3d/share/shaders/k3d_volcube.sl:287:		density_sum = 1;
k3d/share/shaders/k3d_volcube.sl:302:    Oi = density_sum;
