c# - How i can calculate 2d bounding box with 3d transformation -

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i'm working on opengl project. set perspective projection , render transformed rectangle (rotated, scaled)

how can calculate rectangle's bounding box (rectangle position,size)

thank you

you'd run rectangle through same matrices opengl transform 3d points 2d screen-space ones. input vectors, multiply them want apply object, modelview matrix, projection matrix, have screen-space coords. check whether resulting coordinates on-screen, can calculate minimum/maximum x , y coordinates, , have bounding rectangle.

see here (9.100), if you've got glu utility library functions available:

http://www.opengl.org/resources/faq/technical/transformations.htm

hope helps.


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