k3d/share/shaders/k3d_oak.sl:28: *   divotdepth - depth (in shader units) of the displacement due to
k3d/share/shaders/k3d_oak.sl:61:		float divotdepth = 0.05;
k3d/share/shaders/k3d_oak.sl:77:  Nf = faceforward(Displace(Nf, "shader", -wood * divotdepth, truedisp), I);
k3d/share/shaders/k3d_oakplank.sl:35: *   divotdepth - depth (in shader units) of the displacement due to
k3d/share/shaders/k3d_oakplank.sl:111:		     float divotdepth = 0.012, truedisp = 0;
k3d/share/shaders/k3d_oakplank.sl:158:  float disp = -wood * divotdepth + groovedepth * (edgedisp - 1);
