how to delete lines in c++ using OpenGl

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i build a game that a ball fly in window and when hit the lines , the lines will Disappear and so on .. how i can do this ??

Posted 11-Dec-11 8:19am

danger man 2011

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Addy Tas 11-Dec-11 14:23pm

Maybe a silly suggestion but what about overwriting the targeted line with the background?

Cheers, AT

[no name] 11-Dec-11 16:35pm

Not really a good idea in OpenGL

Addy Tas 11-Dec-11 16:48pm

No idea why the hell i even sugested such a thing when i'm fully aware that you can remove the lines or even make them runaway from the ball. I guess it really is time to call it for today.
Sorry guys; sudden stroke of blondness.
Signing off for today, AT

Sergey Alexandrovich Kryukov 11-Dec-11 19:25pm

Of course the initial suggestion would not work, tambores63 is right, but I think deletion of the lines if artificial problem. The question is not quite clear, though. If the line is simply blocked from view, it should not be removed, if this is a part of action, the object representing the line should be hidden or simply removed.
--SA

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smokindinesh · Answer 1 · 2012-05-03T04:21:00

While drawing lines specify it's color with alpha value

glColor4f(R,B,G,A)

"A" means alpha value and define the transparency ,if it is equal to 1 then complete Opaque and if 0 then complete transparent.
By changing the alpha value of lines,your problem will be solve.
After collision make alpha value equal to 0 then it will be transparent and seems like disappear.