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asaari

Multiple Viewports/Perspectives

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How can you make Multiple Viewports/Perspectives?? Like a square in the top left of your screen that shows the view through someone in your squad''s eyer etc.? Ive seen this done in a few D3D games, but I dont remember seeing it in openGL, is there a way to do this, is it very complicated? thx in advance
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To do something like that, you''d need to render two scenes, your view and the buddy-cam view, render the buddy cam in a samll off-screen buffer and blit onto the primary buffer.

If you wanted a rear-view, you might be able to use environment mapping...

Magmai Kai Holmlor
- Not For Rent
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Ive done this before, one of the ways to do this is to render the everything you need from the 2nd cameras POV to a texture, then render the texture to a quad. The only problem with this is the speed factor. This will probably slow down your framerate considerably so you will want to implement a lower LOD for the 2nd POV because it will probably be rendered to a smaller portion of the screen.
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I think the simplest way is something like this:


glViewport(yadda yadda);
// set projection matrix

// Draw first scene


glViewport(yadda yadda);
// set projection matrix

// Draw second scene


I''m not sure if you can have the viewports overlapping though.
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I''m sure the viewport thing would work. I was going to suggest that too. If there are any problems, just mask out the rest of the scene when doing the 2nd camera.
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