TEX	checker

MAT 255 255 255     4.0                 0.0 0.0 //light
MAT 255 255 255     0.0                 0.0 0.0 //white

MAT 255 100 100     0.0                 0.0 0.0 //red
MAT 100 255 100     0.0                 0.0 0.0 //green
MAT 100 100 255     0.0                 0.0 0.0 //blue
MAT 255 255 100     0.0                 0.0 0.0 //yellow

MAT 50 50 50        0.0                 0.0 0.0 //gray

qu  -1 2.5 -1     2 0 0   0 0 2           0

pl  0 3 0        0 -1 0    1
pl  0 -3 0       0 1 0    6
pl  3 0 0       -1 0 0    5
pl  -3 0 0       1 0 0    3
pl  0 0 -3       0 0 1    4
pl  0 0 3        0 0 -1    2

po  -0.33 -0.66 -1	0 1 0	0.5 0.5 -0.5	    0	2
po  -0.5 -0.5 1		0 1 0	1 0 0	    1	4