k3d/share/shaders/k3d_ceramictiles.sl:90:color tiletexture(float tileindex;
k3d/share/shaders/k3d_ceramictiles.sl:228:  color Ctile = tiletexture(tileindex, stile, ttile, dss, dtt,
k3d/share/shaders/k3d_checkerboard.sl:11:  float tiles, tilet;
k3d/share/shaders/k3d_checkerboard.sl:33:  tilet = step(1.0, mod(t * TileT, 2.0));
k3d/share/shaders/k3d_checkerboard.sl:35:  if(tiles == tilet)
