Subject:
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Re: Clipping / CCW / CW / INVERT
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Newsgroups:
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lugnet.cad.dev
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Date:
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Sat, 9 Oct 1999 00:21:07 GMT
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Viewed:
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571 times
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Leonardo Zide wrote:
> If you keep changing states (turning backface culling on/off or
> changing front faces from CW to CCW) very often, you'll get a *slower*
> rendering in OpenGL (don't know about D3D).
Do you know the reason why?
The change-state-calls could cost a little overhead, but don't they just set some flags?
And these flags would just cause negating an orientation test?
/Lars
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Message has 1 Reply:
 | | Re: Clipping / CCW / CW / INVERT
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| (...) I once asked the same question :) Most OpenGL drivers have part of the rendering code create at runtime instead of having if/else statements for all the possible flags. When you change the state, the driver has to rebuild the code again and (...) (25 years ago, 9-Oct-99, to lugnet.cad.dev)
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Message is in Reply To:
| | Re: Clipping / CCW / CW / INVERT
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| (...) No, when I look at the images I see real alpha-blended surfaces :) I've tried to turn backface culling in the transparent parts and they looked very ugly, it's better to draw everything in those cases. (...) Just a note to correct the (...) (25 years ago, 8-Oct-99, to lugnet.cad.dev)
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