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A Simple Corona Problem

Started by DisKordCoder Jan 22, 2001 at 9:13 PM 0 replies 400+ views

Original Post

Jan 22, 2001 at 9:13 PM

Coronas can be easy to draw, but ive got a problem with when to draw them. How can i tell if the light can be seen, or if its hidden? How can i tell if there is a polygon in front of my light, so that i dont draw the corona?? Thanks!

MothaBrain

Jan 23, 2001 at 8:24 AM

I think there are 2 ways to solve your problem.
I didnt do it for my game yet, but I think it''s the way like this:

1. If your coronas are applied at the end of your rendering process, you should be able to check the z-value of your light against the current zbuffer value at the transformed point of the light. If there''s another (a nearer) z value in the zbuffer
your light will be hidden. Then the corona wouldnt be visible.
(Dont know if its slow to check the zbuffer for every light)

2. You can trace a ray from the viewers point to the light (in "real" 3D)
If the line hits any geometry you corona wont be visible

Hope this helps

Have a look at our game "Crashday" at www.moonbyte.de

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