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# kyewong

Member Since 18 Oct 2011
Offline Last Active Dec 18 2013 08:56 PM

### how to solve for modelview/projection matrix?

19 November 2013 - 04:07 AM

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?

### modelview and projection matrices

19 November 2013 - 04:05 AM

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?

### CSG computation problem

18 October 2011 - 12:41 AM

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!

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