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  Transforming a plane  (Read 1146 times)
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Offline DavidYazel

Junior Devvie




Java games rock!


« Posted 2003-12-14 13:28:12 »

In order for colliders to work efficiently we need to be able to check for collisions against objects that have been transformed.  One of the problems is that the plane equation for each triangle and the splitting planes for the bitree nodes have been pre-calculated.  How could I take the vworld transform of the model and transform the a,b,c,d of the plane equation?

I am thinking that I transform a,b,c as I would a vector and then scale d?  Would that work?

David Yazel
Xith3D Project Founder
http://xith3d.dev.java.net

It may look complicated, but in the end it is just a bunch of triangles
Offline NVaidya

Junior Devvie




Java games rock!


« Reply #1 - Posted 2003-12-14 15:43:41 »



I guess what is applicable here is P' = PM^-1, where
P is your plane [a, b, c, d] in model coordinates, M is
the model matrix that takes a point from model to view world
coordinates, and P' is the transformed plane equation in
view world.

Check page 671 of Redbook, 3rd ed., anyways.

Gravity Sucks !
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