projection-matrix

Obtaining projection matrix

I have calibrated stereo images. I want to get a projection matrix using rotation matrix ,translation vector, radial vector and a camera matrix. How can get the projection matrix? ...

OpenGL ES 2.0 equivalent of glOrtho()?

In my iphone app, I need to project 3d scene into the 2D coordinates of the screen for some calculations. My objects go through various rotations, translations and scaling. So I figured I need to multiply the vertices with ModelView matrix first, then I need to multiply it with the Orthogonal projection matrix. First of all am on the ri...

OpenGL - ortho Projection matrix, glViewport

I'm having trouble wrapping my head around how these work. First, in a 2d game the projection matrix should be set up as ortho with left, right, top, bottom matching the window, right? But when the window resizes, should I just change glViewport, not the projection matrix? And how do I keep the aspect ratio? Could someone explain the pu...

OpenGL ES 2.0 (specifically for the iphone) rendering is slightly off. Best guess is it's a projection matrix problem.

So I bought O'reilly's Iphone 3D programming and found what I believe to be a bug in there code. However I can't figure out what the problem is, and unless I do I can't move forward with my own code. I will paste what I consider to be the appropriate code into this post but luckily all the code is available online at: http://examples.or...