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View Full Version : a promblem about view frustum culling



jxaa031757
07-29-2013, 02:38 AM
i read graphics book, book says view frustum culling occurs between projection matrix transform and project divide.
it means that the point go to view frustum culling is nonhomogeneous coordinate.

then , for example it does culling by using Sutherland-Hodgeman algorithm, but i see some graphics books which describe this algorithm, it processes by the 3d coordinate. is it means that we need divide w to get the 3d coordinate? this way repeatly uses the action of projection divide in next step. maybe my thinking is wrong. but i don't know where is wrong.

can u help me solve my problem? thanks a lot!

Dark Photon
07-29-2013, 04:59 AM
Don't cross-post. Post your question on one forum only.

Thread collapse here:
* a promblem about view frustum culling (http://www.opengl.org/discussion_boards/showthread.php/182365-a-promblem-about-view-frustum-culling)