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In lugnet.cad.dat.parts.primitives, Kyle McDonald writes:
> Ross Crawford wrote:
>
> >
> > Sub-parts are handled differently to primitives (from an authoring view
> > point). While primitives are generally not in-lined, sub-parts used during
> > authoring are often in-lined, if it doesn't increase the total file size of
> > the part too much. Having all the polygons in a single file is a slight
> > advantage when rendering.
>
>
>
> I think it is an extremely small advantage.
However, when deciding whether or not to in-line sub-parts, reducing polygon
count isn't a consideration. Any other advantage, small or not, should be
maximised.
> What programs actually
> read any file more than once?
Whether they do or not, there's still extra time spent identifying the
buffer, and doing extra matrix calculations for each instance.
> It still seems to me that reducing the polygon count (when possible)
> would improve performance more than reducing the number of files that
> are read. My program spend hardly any time at all reading files.
Sure, reducing polygon count is good, but it doesn't necessarily require a
new primitive or sub-part to do that. In the case of this new ring
primitive, unless it's needed by several parts, it's probably better to have
it in-line in the part(s). The solution of using the existing ring
primitives is an option, to avoid having to calculate the ring co-ordinates,
but is probably not the preferred option.
ROSCO
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Message has 1 Reply:
 | | Re: ring 3 to 5
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| (...) Actually, for rounded elements, it's almost always[1] preferable to use primitives. That way, programs that do primitives substitution can replace the polygonal primitive with a true round object. -- Steve 1) 'almost always' meaning, 'I can't (...) (22 years ago, 3-May-02, to lugnet.cad.dat.parts.primitives)
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Message is in Reply To:
| | Re: ring 3 to 5
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| (...) I think it is an extremely small advantage. What programs actually read any file more than once? I mean, Are there programs that actaully open the file and read the part in every time it's referenced? Or are there programs that even if they (...) (22 years ago, 3-May-02, to lugnet.cad.dat.parts.primitives)
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