k3d/share/shaders/k3d_brickbump2.sl:38:    float sbump, tbump, stbump;
k3d/share/shaders/k3d_brickbump2.sl:57:    sbump = smoothstep(0,MWF,ss) - smoothstep(1-MWF,1,ss);
k3d/share/shaders/k3d_brickbump2.sl:59:    stbump = sbump * tbump;
