pngs 180 120 hw4verts- 24
fps 8
div t f l

# tetrahedron can be a cube with half the vertices at 2/3,2/3,2/3 instead of 2,2,2
# we let x vary from -1 to 1, x2 from 0 to 1, x3 from 0 to 4/3, and x4 from 2/3 to 2

mul angle t 180
cos x angle
pow x2 x 2
mul x3 1.3333333333333 x2
add x4 0.6666666666666 x3
mul x5 -1 x4

# Set a 3-by-2 aspect ratio, 90° field-of-view in Y, near plane at 0.1, far plane at 10
loadp 0.6666666666666 0 0 0  0 1 0 0  0 0 -1.02020202020202 -0.20202020202020202  0 0 -1 0

object box world
quaternion 1 0 x 0
position 0 0 -5
xyz -2 -2 -2
xyz -2  2  2
xyz  2 -2  2
xyz  2  2 -2

xyz x5 x5 x4
xyz x5 x4 x5
xyz x4 x5 x5
xyz x4 x4 x4

color 1 0 0
trif 1 3 5
color 0 1 0
trif 3 2 5
color 0 0 1
trif 2 1 5

color 1 0.5 0.5
trif 3 1 7
color 1 0.5 1
trif 1 4 7
color 1 1 0.5
trif 4 3 7

color 0 0.5 0
trif 2 3 8
color 0.5 0.5 0
trif 3 4 8
color 0 0.5 0.5
trif 4 2 8

color 0.3 0.7 0.7
trif 2 4 6
color 0.7 0.3 0.7
trif 4 1 6
color 0.3 0.3 0.7
trif 1 2 6