[Gate-users] trpd geometry
adler at stephenadler.com
Mon Dec 7 22:49:32 CET 2015
In the above wiki page, if you scroll down to "Commands of the sub-tree
geometry for different shapes" table, you'll find the parameters
involved with defining a trpd object.
I've been working with trying to define such an object in a small
simulation and have had trouble making it work.
First of all, it looks to me that the "setX1Length: Set half length
along X of the plane at -dz position" should actually read "setX1Length:
Set length along X of the plane at -dz position". I'm not sure where the
"half" bit is coming from but from my detailed debugging of my geometry,
the number I enter for setX1Length is actually the full length not the
Furthermore, I'm having trouble with setting the Z length of the trpd
object. If I set it too long, then the trapezoidal shape turns into
something which looks like a broken crystal. Or a trapezoid with someone
taking a hammer a banging out a chunk in a corner. Are there limits to
what the Z length should be relative to the X1, X2, Y1, Y2 lengths?
Finally, I'm having a hard time generating a ring of trpd objects since
I would like the to form a ring of objects with each one touching the
side of the other. Because of the definition of the trpd object, I have
to do an initial rotation of the object to align it properly so the
short face of the trpd object "faces" the Z axis or center of the field
of view. Then when I apply the ring duplication, my trpd object gets
rotated out of the XY plane because I applied that original rotation to
the first trpd object. This could be avoided if there was a Z1 and Z2
lengths I would set, but it looks like the trpd object assumes the Z
length to be the same, or the "thickness" to be aligned along the Z
axis. (If that makes any sense.)
Anyhow... any reply is greatly appreciated.
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