Subject:
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Re: Overlapping primitives - a reason to Hold a part?
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Newsgroups:
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lugnet.cad.dat.parts
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Date:
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Sun, 16 Jul 2006 13:21:00 GMT
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Viewed:
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3230 times
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In lugnet.cad.dat.parts, Guy Vivan wrote:
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In lugnet.cad.dat.parts, Timothy Gould wrote:
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In lugnet.cad.dat.parts, Travis Cobbs wrote:
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In lugnet.cad.dat.parts, William Howard wrote:
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What is the policy on overlapping primitives in a part? Is it OK? Is it
frowned upon? Is it accepted as the norm? Is it only accepted under
exceptional circumstances? It excessive over-lapping of primitives (or
quads/tris) a reason to Hold a part? Is any over-lapping (beyond the
exceptional) a reason to Hold the part?
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I don’t know what the policy is (or if there is one), but I will point out
that it will likely cause artifacts in any transparent parts in any viewer
that supports blended transparency (such as LDView). The overlapping
sections will get drawn twice, making them a noticeably different shade.
Here’s an example of a quad overlapping a disc drawn in transparent gray:
--Travis
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Ahhh. Very good point. I think you’d get problems in povray too.
Tim
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If you post a hold vote for all parts contain a overlaping between a
primitive and a quad or triangle, you must post a hold vote for all parts
with contain a stud (ex : all brick !!!). Because all studs are overlaping
with quad or box. It is necessary to make the difference with an excessive
overlapping (bad use of primitive and quad) and a necessary overlapping for
the check returned by the part.
In your example, it’s easy to replace by 4-4cyli and 1-4ndis.
But in a
real parts it’s different. You still have no possibility of assembling
correctly a primitive with the remainder of the part, either you not used not
of primitive!
Else you must create a new primitive for only one part used !!!
You
must post a hold vote only if you can replace a bad quad and/or primitive by
one other better part/or primitive. (ex: replace box5 by box4-1).
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I may be misunderstanding you here but if it comes to the difference between a
part having less primitives or a part displaying correctly I would always
encourage displaying correctly. We don’t use the Ldraw system to save computer
memory, we use it to make models that look like Lego.
Tim
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