Subject:
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Re: LDD vs LDraw
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Newsgroups:
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lugnet.cad
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Date:
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Wed, 13 Dec 2006 20:58:52 GMT
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Viewed:
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1765 times
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In lugnet.cad, Timothy Gould wrote:
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- I love LDView’s rendering, zoom and rotation capabilities for inspecting models. Would like to see that level of realism and ease-of-use built right into the CAD program itself.
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Apart from looking nicer I don’t think there’s any viewing that LDView can do
that MLCad can’t.
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While mostly true, I think you’re minimizing the utility that a really good 3D
view could provide to MLCad. (Note that this isn’t meant as a put-down of
MLCad; implementing a really good 3D view requires effort that might best be
used for other features.)
Bearing in mind that LDView wasn’t created in such a way as to be usable in an
editor (although it could be modified to allow this), here are the LDView
features that I think would be useful in the 3D view of an editor:
- Speed. Being able to rotate most models in realtime helps a lot in examining a model for problems.
- Solid rotation. This kind of relies on the above point in order to be effective. The bounding box rotation in MLCad is there presumably to go faster.
- Rotation center same as model’s center (at least as an option). Having it rotate in wireframe around the model’s origin, and then jump when you let go leaves a lot to be desired.
- Good lighting. It’s hard to provide a definition for “good” in this context, but lighting can sometimes help in seeing problems with a model.
- Decent quality transparency. Stipple transparency can be fast, but it has one major drawback: the first transparent surface hit complete hides all transparent surfaces behind it. This can lead to transparent parts in the interior of a design disappearing completely visually.
- Cutaway. Hold down control while zooming in in LDView, and it cuts into the model to see inside. Not sure how useful this would be in an editor.
Obviously I have some bias, being the author of LDView, but I think at the very
least that the first five points above are valid. It’s worth noting that LeoCAD
has the first two points covered. (LeoCAD also has blended transparency instead
of stipple, but it draws parts in their entirety all at once. So if you have
two different colored transparent pieces connected to each other, you get some
odd effects at some angles.)
--Travis
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Message has 2 Replies:
 | | Re: LDD vs LDraw
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| (...) Hi Travis, I frequently use LDview during the editing for the reasons you outline above. My point was more in argument against the "zoom and rotation" section of the comment. I would love to have a renderer as good as LDView implemented in (...) (18 years ago, 13-Dec-06, to lugnet.cad, FTX)
| | | Re: LDD vs LDraw
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| (...) Unfortunately this is a tradeoff between quality and speed, if I sorted by triangle it would give better results but would also be much slower to render. There are other options for transparency sorting, like doing a Z init pass or rendering (...) (18 years ago, 13-Dec-06, to lugnet.cad)
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Message is in Reply To:
| | Re: LDD vs LDraw
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| Hi Chris, Some of what you ask for in MLCad can already be done... (...) This surprises me. I've never had a problem. (...) You can sort of do this with submodels (...) Apart from looking nicer I don't think there's any viewing that LDView can do (...) (18 years ago, 13-Dec-06, to lugnet.cad, FTX)
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