cstype bmatrix
deg 3 3
step 3 3
bmat u  1  -3   3  -1 \
        0   3  -6   3 \
        0   0   3  -3 \
        0   0   0   1

bmat v  1  -3  -3   2 \
        2   2   2   3 \
        0   0   0  -2 \
        0   0   0   2

# Special point and space curve data
vp 0.500
vp 0.700
vp 1.100
vp 0.200 0.950
v  0.300 1.500 0.100
v  0.000  0.000  0.000
v  1.000  1.000  0.000
v  2.000  1.000  0.000
v  3.000  0.000  0.000
cstype bezier
deg 3
curv 0.2 0.9 -4 -3 -2 -1
sp 1
parm u 0.00 1.00
end
# Trimming curve
vp -0.675  1.850  3.000
vp  0.915  1.930
vp  2.485  0.470  2.000
vp  2.485 -1.030
vp  1.605 -1.890 10.700
vp -0.745 -0.654  0.500
cstype rat bezier
curv2 -6 -5 -4 -3 -2 -1 -6
parm u 0.00 1.00 2.00
sp 2 3
end

# Surface
v -1.350 -1.030 0.000
v  0.130 -1.030 0.432 7.600
v  1.480 -1.030 0.000 2.300
v -1.460  0.060 0.201
v  0.120  0.060 0.915 0.500
v  1.380  0.060 0.454 1.500
v -1.480  1.030 0.000 2.300
v  0.120  1.030 0.394 6.100
v  1.170  1.030 0.000 3.300

cstype rat bspline
deg 2 2
surf -1.0 2.5 -2.0 2.0 -9 -8 -7 -6 -5 -4 -3 -2 -1
parm u -1.00 -1.00 -1.00 2.50 2.50 2.50
parm v -2.00 -2.00 -2.00 2.00 2.00 2.00
trim 0.0 2.0 1 2.2 2.2 3
sp 4

con 1 2.0 2.0 1 2 4.0 3.0 1
end