Subject:
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Re: Some secrets of MLCad revealed ...
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Newsgroups:
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lugnet.cad.mlcad
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Date:
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Sat, 5 Jul 2003 20:22:01 GMT
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Viewed:
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3562 times
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"Damien Guichard" <damien.guichard@wanadoo.fr> schrieb im Newsbeitrag
news:HHIuq2.BMG@lugnet.com...
> In lugnet.cad.mlcad, Michael Lachmann wrote:
> > Ok since a lot of you are asking me to provide more details about • MLCad's
> > rendering technic I'll go and tell you some details about it:
> >
> > ...
> >
> > 2) Point reduction and Compression
> > Inside the cached file MLCad maintaines a list of objects representing
> > lines, triangles ... where each object stores all its points and • parameters.
> > After a while I found it much more practicable to compress this drawing
> > information. Therefor MLCad can check the primitives after loading the • file
> > for its points and creates a list of points used in this file.
> > If you check a file you will find a lot of equal points in there. Now • each
> > point is stored only once, and therefor now calculated only once during
> > rendering. The primitive objects now refere to a point instead of • carrying
> > it.
> >
> > ...
> >
> > Regards,
> > Michael
>
> Thanks Michael.
> Is the list of points sorted? How do you sort it? Hashcode? Octree?
>
> Regards,
>
> Damien
No this list is not sorted at all, its just an array of points, directly
referenced by index from within the primitives.
Michael
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Message has 1 Reply:
 | | Re: Some secrets of MLCad revealed ...
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| (...) Thanks Michael. So, at loading time, each added point has to be compared to all points in the point list. Does this impact the loading time of big parts or big models in a significant manner? Or is it only minor slowdown? Regards, Damien (21 years ago, 5-Jul-03, to lugnet.cad.mlcad)
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