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Hello,
I've searched the povray site and googled, but either I am too stupid to
formulate my question correctly or I'm blind or overlooking something.
I am working on a larger hobby project and therefore I need screws, nuts, bolts,
etc. Therefore I created a function which generates a screw thread. Also I
constructed a hexagon nut. For the hole in nut I tried to subtract the screw
thread from the nut like this:
difference {
object {nut_body}
union {
isosurface {
function{ f_helix1( x,y,z,
1, // number of helixes, (1 = single helix, 2 = double helix etc.)
(2*pi)/incline, // period, turns on the length of 2*pi
incline*2, // minor radius,
nominal, // major radius,
1, // shape parameter,
2.0, // cross section type,
// (0.0 to 1.0 = square ... rounded to circle
// over 2.0 to 3.0 = rounded to diamond and concave diamond
0 ) // cross section rotation angle
}
contained_by {box { -length/2 , length/2 }}
threshold 0
max_gradient 3.168
accuracy 0.0001
all_intersections
}
cylinder {<0,-length/2,0>,<0,length/2,0>,inner}
}
}
As a result I get a nut with a squared hole in the middle instead of a hole
drilled into the nut_body by the isosurface.
The povray documentation states that isosurface can be combined with solid
objects, however this does not work in this example. So what am I missing? Or
do I have to remodel the nut_body with a function as well and subtract both
functions?
Thanks for any advice
Reiner
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