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Sir Psycho

Really simple 3d question

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Ok, im writing a 3d engine, and i have a REALLY STUPID problem. I have a function which you pass the 3d coordinates x y and z, then it returns the 2d coordinates to be drawn on the screen. Here is the calculation: LENS = 256 Distance = (LENS-Z); ScrX=(LENS*X/Distance)+(SCREEN_WIDTH/2) ScrY=(SCREEN_HEIGHT/2)-(LENS*Y/Distance) I have an aircraft which you pilot, and some terrain. But when you fly over the terrain, it goes comes shooting out at the top of the screen at twice the speed!!! whats going on ?!?!?!

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x_2D = center_x + LENS * ( x_3D / z_3D )
y_2D = center_y - LENS * ( y_3D / z_3D )

Hope this helps!



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