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I have a problem using glOrtho in a program that uses GLMDraw() function of GLM library to draw Google SketchUp 3D images. I wanted to see the image for only certain values of z in Projection mode and glOrtho() didn’t seem to work so I made the following code to test it:
glOrtho(0.0f, 2.0f, 0.0f, 2.0f, 0.0f, 0.0f);
Since near and far planes are the same I thought I should see no image but I see the whole image.
What I am missing?
If you call glOrtho with znear=zfar, it generates a GL_INVALID_VALUE error, and probably just discards the call.
http://www.opengl.org/sdk/docs/man/xhtml/glOrtho.xml
Try giving it a range greater than zero.