Re: ScissorRect and ViewPort
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"Jens Pedersen":
I need to make some clipping in the images I render.
I see two ways of doing that: ScissorRect and ViewPort
Which one is most efficient?
And what is the difference?
The Viewport transforms the divided clipping space to a
rectangle, while the scissorRect clips to a rectangle of
the viewport.
Clipping to the Viewport is implicizly done in clipping-space
on geometry level (in the triangle setup phase). In contrast,
the scissor-test is logically a per pixel operation, somewhere
near to z-test. This doesn't tell about it's actual performance.
Another option would be to set up user clipping planes.
Gruss
Jan Bruns
.
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... I have tried to make multi-viewports and there clipping volumes. ... But the only way I have come to know to draw something in a particular ... viewport is by drawing within the context of a viewport i.e setting ... viewport,its clipping volume then followed by drawing commands that ...
(comp.graphics.api.opengl) |
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