Zooming in effects

Helicon56 · 2003-01-30T18:48:51

Hi, I''ve seen it loads of times in games when a camera seems to zoom in to get a better look at something, normally with sniper rifles... so does anyone knoe how it''s done? --helicon56.

Graphics and GPU Programming Programming

Started by Helicon56 January 29, 2003 07:06 AM

12 comments, last by Helicon56 21 years, 2 months ago

mdias

823

January 29, 2003 09:56 AM

In DirectX you can do that this way:

float p_Zoom = 1.0f;D3DXMATRIX ProjectionMatrix;D3DXMatrixPerspectiveFovRH( &ProjectionMatrix, p_Zoom, 640.0f/480.0f, p_MinViewDistance, p_MaxViewDistance );

Now you only need to update the ''p_Zoom'' variable

KaMiKaZe

Helicon56

122

Author

January 29, 2003 10:01 AM

cool sounds good, cheers guys, i''ll give it a go now.

thanks alot,
--helicon56.

Helius

122

January 30, 2003 02:38 PM

Yes! The right way to achieve the zoom effect is altering the Fov of the projection matrix. The human Fov is near to 50 degrees, try reducing it up to 5 degrees to simulate a zoom in effect and backwards to 50 to produce a zoom out. Remember I said degrees not radians

CrazedGenius

156

January 30, 2003 06:48 PM

Sometimes it helps to think about how these things work in real life. The sniper scope changes the FOV. Fortunately, it doesn''t move the sniper closer to his target.

Author, "Real Time Rendering Tricks and Techniques in DirectX", "Focus on Curves and Surfaces"

Author, "Real Time Rendering Tricks and Techniques in DirectX", "Focus on Curves and Surfaces", A third book on advanced lighting and materials

Zooming in effects

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