Subject:
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Re: Is it possible to use LDView as POV-Ray previewer?
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Newsgroups:
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lugnet.cad.ray
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Date:
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Sun, 4 Dec 2005 06:50:14 GMT
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Viewed:
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7999 times
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In lugnet.cad.ray, Robert Seifert wrote:
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Thanks to both of you. Just for me, I would be completely satisfied if LDView
shows (and exports to clipboard) full 4*4 trafo matrix instead of 3*3 matrix
as it does in current version. Then I am able to derive .pov trafo matrix by
myself. Small change (probably just changing corresponding indexes in export
and import routine) would make it. Moreover you’ll get better results when
using command line. Currently LDview’s menu item “View/Show View Info” shows
(and exports) only 3*3 rotation matrix, and that’s not enough.
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As it happens, the 3x3 matrix that LDView gives you when you do View->Show View
Info isn’t the camera matrix. It’s the rotation matrix applied to the model
around the model’s centroid. Having said that, I can derive a camera matrix
based on the model’s rotation matrix, the model’s centroid, the camera’s
position, and the camera’s actual rotation matrix. (Unless you go into
fly-through mode, the camera’s rotation matrix is always an identity matrix, but
I’ll certainly include that so that it will be correct if you do go into
fly-through mode.) Then I need to apply the coordinate system handedness
conversion in order to make it useful in POV-Ray, since LDraw uses a
right-handed coordinate system.
--Travis
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Message is in Reply To:
 | | Re: Is it possible to use LDView as POV-Ray previewer?
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| Thanks to both of you. Just for me, I would be completely satisfied if LDView shows (and exports to clipboard) full 4*4 trafo matrix instead of 3*3 matrix as it does in current version. Then I am able to derive .pov trafo matrix by myself. Small (...) (19 years ago, 4-Dec-05, to lugnet.cad.ray, FTX)
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