Subject:
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Dealing with bad lines of L(EGO)Draw parts (tutorial)
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Newsgroups:
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lugnet.cad
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Date:
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Thu, 8 Jan 2009 15:24:42 GMT
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Viewed:
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10011 times
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LDraw parts converted from the LEGO
Universe Team data suffer from some erroneous edge lines and conditional lines.
The conversion tool uses only the angle between facets to decide whether a
normal line or an edge line must be created. With a well chosen threshold this
algorithm gives a good but not perfect result. Some edge lines are present where
they should not (these are easy to delete) but some are missing, and creating
them is not so easy!
Here is a practical process to deal with this issue.
The part as we received from LEGO Universe Team:
The first step will be to process the file with
Lee Gaiteri’s Edger to create missing
conditional lines (the conversion process does not create conditional lines for
concave surface junctions). These conditional lines are appended to the part
file.
Using a good text editor, change all occurences of “/new line/5 24” with “/new
line/2 4”. This effectively transforms all conditional lines into red edge lines
(extraneous data from control points is ignored):
Then begins the tedious manual process. Load the file in MLCad, and change color
of wrong lines (set them “edge color” for normal lines, red for conditional
lines). Note that selecting lines is eased if you use thick lines. (Settings >
General > Change, Rendering tab, chose line width 2 or 3).
When you are finished, check the result with LDView:
If everything is OK, in MLCad select all red elements using the “select same
color” tool and delete them:
Process again the resulting file with Edger to recreate conditional lines and
append them to part file:
Happy parts cleaning !!!
Philo
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