# kyewong

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1. ## OpenGL modelview and projection matrices

Do you mean I should compute such a transformation matrix which is one part of the modelview matrix? If yes, then the projection matrix and factors should be considered fixed for this problem, it is right?
2. ## OpenGL modelview and projection matrices

Yes, it may probably be a over-determined problem, that's the reason why I said "optimal". My question now is, whether it is simple to solve for such a modelview matrix (or the translation/rotation/scale matrix), or such a projection matrix? don't know if there's any prior attempts on solving this problem...
3. ## how to solve for modelview/projection matrix?

Hi guys, I've got a tough problem regarding the modelview/projection matrix in opengl. Say, I have a set of 3D points, and also their corresponding 2D screen positions, is it possible to solve for the optimal modelview (or the scale/rotation/translation) matrix which transforms all these 3D points to the 2D screen positions, when the projection matrix is fixed? or, is it possible to solve for such a projection matrix, when the modelview matrix is fixed?   Thank you and waiting for your answer(any suggestions or useful links are welcome!!)
4. ## OpenGL modelview and projection matrices

Hi guys, I've got a tough problem regarding the modelview/projection matrix in opengl. Say, I have a set of 3D points, and also their corresponding 2D screen positions, is it possible to solve for the optimal modelview (or the scale/rotation/translation) matrix which transforms all these 3D points to the 2D screen positions, when the projection matrix is fixed? or, is it possible to solve for such a projection matrix, when the modelview matrix is fixed?   Thank you and waiting for your answer(any suggestions or useful links are welcome!!)
5. ## CSG computation problem

Hi everyone, I've got a algorithm problem on using the CSG as follows. I put it here in order to get the comments and suggestions on the guys who are interested in it. I have two intersected curves on two orthogonal planes. I can generate two cylinders whose bottom faces are the areas formed by the curves, and whose heights can be infinite. Now I would like to make use of the two cylinders to compute a polyhedral, which interpoate both of the two curves. Especially, I want to make use of the CSG of the two cylidners, such as the union, intersection, difference... Does any one have idea on how to solve it please? Thanks very much if you have any suggestions!