Subject:
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Re: Lpub find edges
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Newsgroups:
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lugnet.cad, lugnet.cad.dev
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Date:
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Sat, 3 Apr 2004 19:20:09 GMT
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Viewed:
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1087 times
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In lugnet.cad, Kevin L. Clague wrote:
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In lugnet.cad, Tim Courtney wrote:
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You should note that the value for the line width is relative to the
resolution of the image, not relative to the size of the object being
rendered. So, if you render a brick that takes up almost all of the space in
your image, your line will appear thin relative to the brick, where if you
have a rendering of a brick that is very far from the camera, the line will
appear thick relative to the brick.
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This is so very true, and troublesome.
POV-Ray does not support the concept of a line in 3D space, so L3P cannot
directly translate LDraw lines to POV-Ray entities.
Lars, at one point we talked about the possibility of having L3P use
cylinders as edge lines on parts. Was there ever any effort made on this?
I guess LPub could try to calculate good values for line width..... given a
camera distance and an image resolution, LPub could render a 2x4 brick and
measure the bounding box. The dimensions of the box could be used to figure
out how thick the line should be. I have no idea how I would calculate the
other parameters.
Feedback?
Kevin
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Cylinders would not resolve every edge lines, at curved surfaces that would be a
problem. There are comercial renderes that do that line and flat surface stuff.
They are used a lot to blend 3D CG with cell animation drawings. I have not
attended Siggraph for some time, but there were several papers on
non-photoreallisc rendering.
Paulo
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Message is in Reply To:
 | | Re: Lpub find edges
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| (...) This is so very true, and troublesome. POV-Ray does not support the concept of a line in 3D space, so L3P cannot directly translate LDraw lines to POV-Ray entities. Lars, at one point we talked about the possibility of having L3P use cylinders (...) (21 years ago, 3-Apr-04, to lugnet.cad, lugnet.cad.dev, FTX)
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