Subject:
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Re: Bricksmith 2.4: Faster. Much Faster.
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Newsgroups:
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lugnet.cad.dev
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Date:
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Wed, 16 Jun 2010 20:10:21 GMT
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Viewed:
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38312 times
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In lugnet.cad.dev, Don Heyse wrote:
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So finally this brings us to a technique that combines the predictive
abilities of the conditional lines with the runtime advantages of the
stencil and BFC algorithms.
Think of the conditional line as a pair of triangles with a shared edge
line. You can ensure the two triangles are wound the same way by going
through the shared edge line in the opposite direction in the two
triangles. This means if we try to draw both triangles in a scene where
the conditional line should show then one of the triangles can be culled
by BFC. So we take advantage of this by drawing the conditional line
triangles (edges only) into the stencil buffer. Then we redraw only
the conditional lines and use the stencil buffer to pass only the
conditional lines that were drawn once. Conditional lines that were
drawn 0 times, or more than 1 time do not pass.
I think it could work. What do you think?
Enjoy,
Don
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Interesting, but complicated IMO :-)
Shaders offer a much easier implementation, and (I suspect) a faster one.
Geometry-shaders for preference, but the algorithm can be implemented using
vertex-shaders or even ARB vertex-programs to support older cards.
Alex
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Message has 1 Reply:
 | | Re: Bricksmith 2.4: Faster. Much Faster.
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| (...) Ah ha! Yet another reason to read that vertex-shader book. So, are you suggesting running this algorithm on the graphics card (with counters for the vertices instead counting pixels in the stencil buffer) or perhaps some other algorithm? (...) (14 years ago, 16-Jun-10, to lugnet.cad.dev, FTX)
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Message is in Reply To:
| | Re: Bricksmith 2.4: Faster. Much Faster.
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| (...) So finally this brings us to a technique that combines the predictive abilities of the conditional lines with the runtime advantages of the stencil and BFC algorithms. Think of the conditional line as a pair of triangles with a shared edge (...) (14 years ago, 16-Jun-10, to lugnet.cad.dev, FTX)
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