 | | | Volume selection ? | Volume selection ? 2004-06-17 - By kim aldis
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you'll need some good geometry and vector algebra for this one. In 2D -
point in poly - one would cast a ray from the point either to left or right
and count the number of times the ray crosses edges in the poly. Odd counts
mean it's in the poly, even mean it's outside. you'd need to research it a
bit but I'd guess the technique would be the same, cast rays from the point,
see how many polygons it intersects with. Do this for each point in each
object you want to check.
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From: owner-xsi@(protected) [mailto:owner-xsi@(protected)] On Behalf Of
Harry Bardak
Sent: 17 June 2004 09:58
To: XSI@(protected)
Subject: [scripting] Volume selection ?
hi everyone.
Well i would like to script something like this :
When i select a box, every object in this box is select.
So in other word how can i detect if an object is inside another one.
Wich way should i follow to do that ?
thanks by advance.
harry.
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<DIV dir=ltr align=left><SPAN class=000190709-17062004><FONT face=Arial
color=#008080 size=2>you'll need some good geometry and vector algebra for this
one. In 2D - point in poly - one would cast a ray from the point either to left
or right and count the number of times the ray crosses edges in the poly. Odd
counts mean it's in the poly, even mean it's outside. you'd need to
research it a bit but I'd guess the technique would be the same, cast rays from
the point, see how many polygons it intersects with. Do this for each point in
each object you want to check. </FONT></SPAN></DIV><BR>
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<FONT face=Tahoma size=2><B>From:</B> owner-xsi@(protected)
[mailto:owner-xsi@(protected)] <B>On Behalf Of </B>Harry
Bardak<BR><B>Sent:</B> 17 June 2004 09:58<BR><B>To:</B>
XSI@(protected)<BR><B>Subject:</B> [scripting] Volume selection ?
<BR></FONT><BR></DIV>
<DIV></DIV>
<DIV><FONT face=Arial size=2>hi everyone.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Well i would like to script something like this
:
</FONT></DIV>
<DIV><FONT face=Arial size=2>When i select a box, every object in this box is
select. </FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>So in other word how can i detect if an object
is
inside another one. <BR>Wich way should i follow to do that ? </FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>thanks by advance. </FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>harry.</FONT></DIV></BLOCKQUOTE></BODY></HTML>
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