k3d/share/shaders/k3d_antialiasedchecks.sl:32:  color checkcolor;     /* Color of the checks */
k3d/share/shaders/k3d_antialiasedchecks.sl:58:      checkcolor = mix (color1, color2, x*y + (1-x)*(1-y));
k3d/share/shaders/k3d_antialiasedchecks.sl:60:      Ci = mix (checkcolor, (color1+color2)/2, smoothstep (.125, .5, fuzzmax));
k3d/share/shaders/k3d_checkerboard.sl:15:  color checkcolor;
k3d/share/shaders/k3d_checkerboard.sl:44:  checkcolor = mix(EvenColor, Cs, mixamount);
k3d/share/shaders/k3d_checkerboard.sl:50:    Os * (checkcolor * (Ka * ambient() + Kd * diffuse(Nf)) +
