world coords to pixel coords

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1 comment, last by Bruno 23 years, 6 months ago

155

Author

October 03, 2000 08:08 AM

Hi Anyone knows the formula to tranform a world coordinate (x,y,z) into pixel coordinates (x,y) ??? thanks Bruno

122

October 03, 2000 10:28 AM

1. Transform XYZ to camera space: multiply XYZ by camera matrix.
2. Project XYZ-in-camera-space on screen:

xScreen = ( x / z * focus ) + screenWidth/2;yScreen = ( y / z * focus ) + screenHeight/2;

Where "focus" is some constant, usually close to screenWidth/2.
Or, more exact:

focus = (screenHeight/2) / tan( FOV/2 );

...
Or use projection matrix.

Edited by - Meduzza on October 3, 2000 11:30:39 AM

122

October 03, 2000 01:37 PM

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