Box rotation
Author
Hello. If I have a box ABCDEFGH[A(X,Y,Z),B(X,Y,Z)...H(X,Y,Z)] and I roteate it around XYZ axis,how can I calculate new coordinates of points ABCDEFGH? Thanks.
Transforming the box corners is really just like transforming any geometry (such as a mesh model). The most common way to do this is to construct a matrix representing the desired transform, and then apply it to each vertex (the box corners, in this case) in turn.
May I ask what you need the transformed corners for? (I ask because if it's for collision detection or frustum culling, you most likely don't actually need the transformed corners.)
May I ask what you need the transformed corners for? (I ask because if it's for collision detection or frustum culling, you most likely don't actually need the transformed corners.)
Author
Thanks for your reply. I want to add BoxInFrustum to NeHe's frustum culling: http://nehe.gamedev.net/data/lessons/lesson.asp?lesson=44
Quote:Thanks for your reply. I want to add BoxInFrustum to NeHe's frustum culling: http://nehe.gamedev.net/data/lessons/lesson.asp?lesson=44You don't need to compute the transformed vertices of the box in order to perform frustum culling; for boxes (both oriented and axis-aligned), you can perform the box-plane test more directly by comparing the projected radius of the box to the distance from the box center to the plane.
More info here and here.
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