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OpenGL Selection Buffer/Ortho Mode Problem

Started by rage989 Mar 11, 2005 at 1:00 PM 3 replies 800+ views

Original Post

Mar 11, 2005 at 1:00 PM

Hello, I am having difficulty making the selection function of openGL work in ortho mode. It works fine when I am in 3D mode, but when I then change to ortho mode to render user interface components, it seems like they take up the entire screen, everywhere you click is the first object I render, in ortho mode. Does anybody have any idea's as to why this might be happening? Thanks in advance, raj.

zedzeek

Mar 11, 2005 at 5:40 PM

theres no difference between ortho + perspective WRT selection, thus check your code.

jake_Ghost

Mar 11, 2005 at 8:30 PM

i was having a big problem as well while using glOrtho, heres how i wrote it so that it would not mess up the modelview matrix.

	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);	glMatrixMode(GL_MODELVIEW);	glLoadIdentity();glDisable(GL_DEPTH_TEST);	glMatrixMode(GL_PROJECTION);	glPushMatrix();		glLoadIdentity();		glOrtho(0,1024,0,768,-1.0f,1.0f);		glMatrixMode( GL_MODELVIEW );		glPushMatrix();			glLoadIdentity();                        // draws stuff here			glMatrixMode(GL_MODELVIEW);		glPopMatrix();		glMatrixMode(GL_PROJECTION);	glPopMatrix();	glEnable(GL_DEPTH_TEST);

hope this helps

rage989

Mar 13, 2005 at 12:28 AM

When do you call your gluPerspective function?

jake_Ghost

Mar 14, 2005 at 8:28 PM

i call that at initialization

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