32 ground: color (0.9,0.9,0.9)
33 sphere 0.05 (p0x,p0y,p0z)
34 sphere 0.05 (p1x,p1y,p1z)
35 sphere 0.05 (p2x,p2y,p2z)
36 sphere 0.05 (p3x,p3y,p3z)
37 cylinder 0.025 (p0x,p0y,p0z) (p1x,p1y,p1z)
38 cylinder 0.025 (p0x,p0y,p0z) (p2x,p2y,p2z)
39 cylinder 0.025 (p1x,p1y,p1z) (p3x,p3y,p3z)
40 cylinder 0.025 (p2x,p2y,p2z) (p3x,p3y,p3z)
42 cylinder 0.025 (p0x+0.1*v01x,p0y+0.1*v01y,p0z+0.1*v01z)
43 (p2x+0.1*v23x,p2y+0.1*v23y,p2z+0.1*v23z)
45 cylinder 0.025 (p0x+0.2*v01x,p0y+0.2*v01y,p0z+0.2*v01z)
46 (p2x+0.2*v23x,p2y+0.2*v23y,p2z+0.2*v23z)
48 cylinder 0.025 (p0x+0.3*v01x,p0y+0.3*v01y,p0z+0.3*v01z)
49 (p2x+0.3*v23x,p2y+0.3*v23y,p2z+0.3*v23z)
51 cylinder 0.025 (p0x+0.4*v01x,p0y+0.4*v01y,p0z+0.4*v01z)
52 (p2x+0.4*v23x,p2y+0.4*v23y,p2z+0.4*v23z)
54 cylinder 0.025 (p0x+0.5*v01x,p0y+0.5*v01y,p0z+0.5*v01z)
55 (p2x+0.5*v23x,p2y+0.5*v23y,p2z+0.5*v23z)
57 cylinder 0.025 (p0x+0.6*v01x,p0y+0.6*v01y,p0z+0.6*v01z)
58 (p2x+0.6*v23x,p2y+0.6*v23y,p2z+0.6*v23z)
60 cylinder 0.025 (p0x+0.7*v01x,p0y+0.7*v01y,p0z+0.7*v01z)
61 (p2x+0.7*v23x,p2y+0.7*v23y,p2z+0.7*v23z)
63 cylinder 0.025 (p0x+0.8*v01x,p0y+0.8*v01y,p0z+0.8*v01z)
64 (p2x+0.8*v23x,p2y+0.8*v23y,p2z+0.8*v23z)
66 cylinder 0.025 (p0x+0.9*v01x,p0y+0.9*v01y,p0z+0.9*v01z)
67 (p2x+0.9*v23x,p2y+0.9*v23y,p2z+0.9*v23z)
70 link: cylinder 0.1 (0,0,0)(1,0,0) color (0.9,0.1,0.1)
74 in_patch: % point and extreme of the normal vector
77 % four points defining a patch
78 ground (p0x,p0y,p0z) (p1x,p1y,p1z) (p2x,p2y,p2z) (p3x,p3y,p3z)
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