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OpenGL perspective question

Started by JeroMiya Aug 28, 2001 at 6:10 PM 2 replies 400+ views

Original Post

Aug 28, 2001 at 6:10 PM

I''ve got a question about perspective in OpenGL. I have a scene where there''s an object close to the viewer that (s)he can move around the screen on the xy plane and then press fire to make it move along the z axis towards a target farther away on the z axis. The problem is, no matter where the user moves the object on the screen, it ends up going to a small space in the middle of the screen. How can I widen this perspective a little so that things don''t go towards the horizen as fast?

Mort

Aug 29, 2001 at 5:59 AM

To select the perspective ratio you select the projection matrix and call gluPerspective(angle, ratio, ZNear, ZFar). Change the angle parameter to change the perspective ratio (The ratio parameter changes ratio between X and Y).

linus78

Aug 30, 2001 at 4:15 AM

The parameters Znear and Zfar is that the "Z field" which will be drawn on the screen?

Qoy

Aug 31, 2001 at 2:04 AM

The Znear and Zfar params are the z coordinates of the near and far clipping planes, respectively. Anything in front of the near or behind the far will not be rendered.

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