[OpenSCAD] Internal treatment of common expressions
L Boyd
lboyd at frontiernet.net
Thu Jun 2 08:27:14 EDT 2016
A portion of my code, used many times, has the following segment:
polyhedron(
points = [
[cos(as)*Rroot, sin(as)*Rroot, z], //0
[cos(as)*Rtipp, sin(as)*Rtipp, z+z1], //1
[cos(as)*Rroot, sin(as)*Rroot, z+z2], //2
[cos(ae)*Rroot, sin(ae)*Rroot, z+zd], //3
[cos(ae)*Rtipp, sin(ae)*Rtipp, z+zd+z1], //4
[cos(ae)*Rroot, sin(ae)*Rroot, z+zd+z2]], //5
There a 2 values of sin and 2 of cos, each of which is used 3 times.
My question is for someone familiar with the OpenSCAD internals.
Does it calculate each of these 3 times? If so, is there a performance
advantage to assigning them to variables, thus calculating them only once?
-----
Larry
--
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