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Old 03-09-2006, 11:55 AM
Jerry Jerry is offline
Join Date: Jun 2004
Posts: 105
Intersection contour

Is it possible to display only the points that two or more 3d objects
have in common? For example, I have a plane intersecting a sphere
and want to show only the circle representing the points that both
have in common.
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Old 03-09-2006, 12:48 PM
farshizzo farshizzo is offline
WorldViz Team Member
Join Date: Mar 2003
Posts: 2,849
Hi Jerry,

There is no built-in way to do this. This could probably be accomplished through a plugin, but I'm still not exactly sure what you want. Do you have some sample screenshot of the effect you are referring to?
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Old 03-11-2006, 08:27 AM
halley halley is offline
Join Date: Oct 2005
Posts: 27
I think Jerry is looking for the intersection of two meshes. It's easy for primitives like [ sphere & plane ], but can get pretty tricky when the meshes are more complicated.

Pictured here is [ sphere & cube ] and the contour is already getting to be a strange shape. If either mesh is not manifold (would leak water), then the intersection space is no longer manifold either.

Except in the most trivial cases, it's not something you can/should try to do in real time with moving objects.

However, there are sometimes some interesting z-buffer tricks which can emulate this kind of work in limited scenarios.

Last edited by halley; 03-11-2006 at 08:32 AM.
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