Part Of The Line Goes Below 0 It Starts Drawing The Line Inverted Again?

Dec 3, 2010

This is more of a mathematical problem than programming problem.I have created a very basic 3D engine using Visual Basic .Net. It displays lines on the screen with an additional z axis. The engine works, however when part of the line goes below 0 it messes up and starts drawing the line inverted again.

This is how it calculates the points:

y = (point.y / z) + offset.y + camera.y
x = (point.x / z) + offset.x + camera.x

Can anyone work out a way to only draw part of the line when it intersects the z=0 axis?

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full code here
-------------
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[Code]...

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[Code]....

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