Subject:
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Re: Feature requests for LDraw/LEdit v. 2
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Newsgroups:
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lugnet.cad.dev
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Date:
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Tue, 16 Mar 1999 16:08:03 GMT
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Viewed:
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1024 times
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On Tue, 16 Mar 1999 07:43:52 GMT, Paul Gyugyi <paul@gyugyi.com> wrote:
> The *strength* of LDRAW is the Type 2 and Type 5 lines.
Going back to the question of new line-types in LDraw2, if we had all the
curved-surface types, there would be little or no use for the Type-5 line, as
long as we could specify that a specific object should be outlined/edged.
Or have separate line-types for drawing edges of curved surfaces/solids. These
would specifically replace the optional-line commands in many primitives.
I would go for a flag to specify whether primitives are edged or un-edged, but
this can get us into a flexibility trap. Does an edged cylinder mean to draw
the circles around the top and bottom as well as the side-edges? If it does,
how can someone draw a cylinder with side edges, but no top and bottom edges?
I haven't looked at the LDraw2 specs in awhile, this may be rehash, but the
following are potential new line-types in LDraw2 (assuming we're sticking with
the basic DAT file format):
DISC (filled in 2D elliptical region, replaces N-Ydisc.dat primitives)
ARC (elliptical edge, replaces N-Yedge.dat primitives)
CYLINDER (Curved Surface, not 3D solid, replaces N-Ycyli.dat primitives)
CONE (Curved surface, not 3D solid, replaces N-YconZ.dat primitives)
RING (filled 2D elliptical region, replaces ringZ.dat and N-YringZ.dat
primitives)
That covers the majors, but leaves things like sloped cylinders (straight and
convex). A general solution for producing curved surfaces would be Very Good,
but Not Possible.
Steve
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Message is in Reply To:
 | | Re: Feature requests for LDraw/LEdit v. 2
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| The *strength* of LDRAW is the Type 2 and Type 5 lines. They are key to making rendered instruction sheet output look good. AC3D is a modeller that supports both triangles and lines, with POV and DXF output. I encourage you to check it out at: (URL) (...) (26 years ago, 16-Mar-99, to lugnet.cad.dev)
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