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Backface Culling Question

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Post  matthew Sun Dec 28, 2008 11:38 am

I'm trying to render a cup shape using sio2 , but only the frontmost mesh faces are being rendered and the "inside back face" of the cup is invisible?

I tried to enable double sided mesh face rendering in Blender, but I still cant get part of the cup to appear.

Also what is the easiest way to detect when object hits the cup?

Your help is greatly appreciated.

Cheers.

matthew

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Post  meteors Sun Dec 28, 2008 12:06 pm

Try putting this in your GL code:

glDisable(GL_CULL_FACE);


-j
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Post  matthew Sun Dec 28, 2008 12:34 pm

Bingo! That did the trick. Thanks a lot meteor.

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Post  meteors Sun Dec 28, 2008 2:18 pm

No worries :-)
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Post  sio2interactive Sun Dec 28, 2008 5:54 pm

Actually you can also use the "twosided" mode, that will render both front & back polygon, this is ideal in the case that your geometry have some alpha....
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Post  matthew Tue Dec 30, 2008 12:15 pm

sio2interactive , thanks for your help. You said "Actually you can also use the "twosided" mode "...

I was wondering how this can be achieved?

Thanks.

matthew

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Post  sio2interactive Tue Dec 30, 2008 4:25 pm

Check the tutorial04 video, Im using "twoside" on the leaf of the palm tree in addition with "translucency" (alpha level in GL) in order to adjust them and to get rid of the blending mode "Value".
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Post  sio2interactive Tue Dec 30, 2008 4:26 pm

Check the tutorial04 video, Im using "twoside" on the leaf of the palm tree in addition with "translucency" (alpha level in GL) in order to adjust them and to get rid of the blending mode "Value".
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Post  matthew Tue Dec 30, 2008 7:34 pm

Cool, thanks sio2interactive.

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