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Hi All,
while trying to track down a bug I found that negative scaling can
make objects disappear and was wondering (not being too well-versed in
POV) whether this is legal or not:
default { pigment { color rgb <1,1,0> }}
union {
sphere {
<-1,0,0>,1
}
sphere { // Sphere101
<1,0,0>,1
}
cylinder { // Cylndr034
<-1,0,0>, <1,0,0>, 0.7
}
scale 1 // <- Change to -1 and see the spheres disappear
}
light_source
{
0*x // light's position (translated below)
color red 1.0 green 1.0 blue 1.0 // light's color
translate <20, 40, 50>
}
camera { location <0,0,6> look_at 0 }
The docs do not say anything about negative scaling. It is
inconsistent in that the cylinder does not disappear, though.
Thoughts?
- Lutz
email : lut### [at] stmuc com
Web : http://www.stmuc.com/moray
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