Back face culling

D

Dipucian

Newcomer
Joined
Aug 23, 2004
Messages
4
Location
Hong Kong
Sorry for a stupid question... actually how does it determine which face is "back"?



I have 3 vertex:
v0: (0, 1, 2)

v1: (0, 0, 2)
v2: (1, 0, 2)

​
which form a simple right-angled triangle.



and I have the camera:
position: (0, 0, -5)

lookAt: (0, 0, 0)
Up: (0, 1, 0)

​
when I use the default culling mode (counterClockwise), I can't see the triangle...

But when I turn it off or use the Clockwise mode, I clearly see that, with differently colored vertex, my triangle vertex are counterClockwise... (v0 on top, v1 left and v2 right)

I'm mad with this, anyone got the same question? I really can't understand this...
 
Thanks for the quick help!!

So, setting cull mode to CounterClockwise means that triangles with counterclockwise vertex are backward facing and will not be drawn...
 
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