Subject:
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Re: LDForge - dev. plans and call for help
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Newsgroups:
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lugnet.cad
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Date:
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Wed, 31 Mar 2010 22:43:27 GMT
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Viewed:
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22336 times
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In lugnet.cad, Travis Cobbs wrote:
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The only polygons that LDView sorts are transparent ones. Everything else is
handled by the OpenGL depth buffer (glEnable(GL_DEPTH_TEST), followed by
glDepthFunc(GL_LEQUAL)). Transparent polygons need to be sorted before
being drawn, and LDView does what you describe above for those. (There’s
more to it than that for transparent polygons; sorting is just one step.)
Sorting by the distance to the centroid is only an approximation, but it’s
good enough to look pretty good for transparent polygons. It’s not good
enough to be used as the primary means of hiding geometry that’s farther away
from the viewer.
--Travis
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I see.. but problem is that if I use glEnable(GL_DEPTH_TEST) then my polygons
won’t render at all. Tutorials related to OpenGL explicitly told not to use
GL_DEPTH_TEST because of this.. how did you avoid it?
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Message has 1 Reply:
 | | Re: LDForge - dev. plans and call for help
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| (...) In order for GL_DEPTH_TEST to work, you have to clear the depth buffer at the same time you clear the rest of the screen: glClearDepth(1.0); glClearColor(0.0, 0.0, 0.0, 0.0); glClear(GLCOLORBUFFERBIT GLDEPTHBUFFERBIT); (Note: the (...) (15 years ago, 31-Mar-10, to lugnet.cad.dev, FTX)
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Message is in Reply To:
| | Re: LDForge - dev. plans and call for help
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| (...) The only polygons that LDView sorts are transparent ones. Everything else is handled by the OpenGL depth buffer (glEnable(GL_DEPTH_TEST), followed by glDepthFunc(GL_LEQUAL)). Transparent polygons need to be sorted before being drawn, and (...) (15 years ago, 31-Mar-10, to lugnet.cad, FTX)
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