k3d/share/shaders/k3d_terran2.sl:23: *    bump_scale - scaling of the mountains
k3d/share/shaders/k3d_terran2.sl:80:	  float bump_scale = 0.07;
k3d/share/shaders/k3d_terranbump.sl:19:			    float bump_scale = 0.04; float multifractal = 0;
k3d/share/shaders/k3d_terranbump.sl:68:    P += (bump_scale * bumpy) * normalize(Ng);
