Subject:
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Re: Question about DAT rendering
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Newsgroups:
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lugnet.cad.dev
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Date:
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Tue, 16 Apr 2002 12:52:59 GMT
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Viewed:
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414 times
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Ken,
We are obviously in the same area the moment. After completing the
conversion of LdGLite to run under MacOS 8.6-9.2 (ie LdGLite (Mac)), I
turned my attention to the two biggest dissapointments to me, namely slow
render speeds and quirky shading of models under OpenGL.
> I've been toying around with a visual DAT editor/viewer for Mac OS X,
> and wanted to know if there is supposed to be any kind of guaranteed
> rendering order on commands within a DAT file.
To date I have got my renderer to produce much better shading and far better
render speeds. However face normals of vertices is taking most of my time at
the moment. Simply put they are not wound in a consistent fasion. Further
more in some cases the same primitive is used to model both inside and
outside faces (eg box5.dat, 4-4cyli.dat etc). So a system of winding will
produce inconsistent results in this case.
Therefore to counter this I have been modelling the more common pieces
(stud.dat...) as glu primitives and intercept them at render time (this
produces excellent shading). Additionally items like box5.dat I intercept
and test if the primitive is exactly a multiple 20 units in width (ie 1
brick) then if that is true, I assume the part to be an outside wall or if
not it's defined as an inside wall.
This process is taking time as each part needs to be considered at the time
of parsing and saved as an OpenGL list. However as when rendering all parts
in the model are defined as OpenGl lists I only call the list numbers for
each part - very fast rendering.
I am open to suggestions as to better ways of doing things.
Andrew...
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Message has 1 Reply:
 | | Re: Question about DAT rendering
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| (...) Hey, I happen to *like* my default shading settings. ;-) I agree with you on the speed issue though... (...) I'm curious, do you have any numbers on how much slower it is on accelerated hardware to do two sided lighting with GL_FRONT_AND_BACK? (...) (23 years ago, 16-Apr-02, to lugnet.cad.dev)
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Message is in Reply To:
| | Question about DAT rendering
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| I've been toying around with a visual DAT editor/viewer for Mac OS X, and wanted to know if there is supposed to be any kind of guaranteed rendering order on commands within a DAT file. Obviously paying attention to STEP commands would be important, (...) (23 years ago, 16-Apr-02, to lugnet.cad.dev)
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