 | | Re: New Part: Castle Shield with Black Falcon Pattern [DAT]
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Chris, When I display this DAT file in MLCAD, I get a couple of "bowties". I've taken the liberty of finding the errant lines and providing solutions for them. 0 4 16 15 7 -10 18.72 6.03 -10 14.93 15.68 -10 12 14 -10 4 16 18.72 6.03 -10 15 7 -10 (...) (25 years ago, 5-Apr-00, to lugnet.cad.dat.parts)
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| | Re: New Part: Castle Shield with Wolfpack Pattern [DAT]
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Chris, When I display this DAT file in MLCAD, I get a couple of "bowties". I took the liberty of finding the errant lines and finding a solution for them. 0 4 6 15 7 -10 18.72 6.03 -10 14.93 15.68 -10 12 14 -10 4 6 18.72 6.03 -10 15 7 -10 14.93 (...) (25 years ago, 5-Apr-00, to lugnet.cad.dat.parts)
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| | Re: Sphere Primitive
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(...) You'd have to ask James these questions. Only he would know. It *looks* like the non-planar quads could be a rounding error, or rounding limitation, since he used just 2 decimal places. Steve (25 years ago, 5-Apr-00, to lugnet.cad.dev)
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| | New Part: Castle Shield with Wolfpack Pattern [DAT]
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Another of the easier shields (putting off figuring out the fine detail of the dragon and lion motifs !) 0 FILE 3846P02.dat 0 Castle Shield with Wolfpack Pattern 0 Name: 3846p02.DAT 0 Author: Chris Dee (chris_w_dee@hotmail.com) 0 Unofficial Element (...) (25 years ago, 5-Apr-00, to lugnet.cad.dat.parts)
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| | Re: Some Words To BFC
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Chuck Sommerville <chucks@he.net> wrote in message news:FsK824.2vK@lugnet.com... (...) I was talking about rendering engines like LDLite, MLCad, L3Lab, etc. You are correct that BFC won't help ray tracing. The big thing that would help ray tracing (...) (25 years ago, 5-Apr-00, to lugnet.cad.dev)
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| | Re: Some Words To BFC
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(...) In other words, every face in a subfile will have other faces in the part-construction that will form the other side of the solid, right? That sounds correct. (...) There are only a couple of non-symmetrical primitives, but they are used (...) (25 years ago, 5-Apr-00, to lugnet.cad.dev)
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| | Re: Some Words To BFC
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(...) BFC wont help ray tracers. Just because a surface isn't visible from the _current_ camera position, doesn't mean it doesnt cast a shadow or a reflection. Ray tracers need those backsides. -Chuck (25 years ago, 5-Apr-00, to lugnet.cad.dev)
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| | Re: Some Words To BFC
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koen <koen.jordens@studen...ven.ac.be> wrote in message news:FsK5CI.BxG@lugnet.com... (...) time, (...) "Fast" is a relative term. For very large models, Datsville for example, it takes long enough to render that even a 30% increase in speed makes (...) (25 years ago, 5-Apr-00, to lugnet.cad.dev)
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| | Re: Some Words To BFC
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I've got a little question. Why are you working so hard on BFC. The rendering in Ldraw, L3lab, MLcad,.... is already very fast. Is the speed improvement gained with BFC supposed to provide the extra time, so you can turn an model in realtime, with a (...) (25 years ago, 5-Apr-00, to lugnet.cad.dev)
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| | Re: The geometry of minifigs
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(...) The angle of the side of the minifig torso as Ldrawn is 9.782 degrees (arctan 4.655/27) from the vertical. Hope this helps. Chris (25 years ago, 5-Apr-00, to lugnet.cad.dev)
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| | The geometry of minifigs
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At what angle and point do the arm/shoulder of the minifig connect to the torso? What is the angle and offset of the bend of the minifig arm and what is the angle of the hand with respect to the pin which connects it to the arm? I don't see how (...) (25 years ago, 5-Apr-00, to lugnet.cad.dev)
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| | Re: Some Words To BFC
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(...) This points out that ray traced renderings of the transparent version of these pieces will not render the refraction correctly. In the best of all worlds, the interior surface would be removed. For ray tracing, the model could be replaced with (...) (25 years ago, 5-Apr-00, to lugnet.cad.dev)
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| | New Part: Castle Shield with Black Falcon Pattern [DAT]
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I have taken the opportunity to split out the non-decorated surface into a subpart in line with current practice for decorated parts. For this part I have hardcoded the shield as grey, so that the part colour controls the border - blue or yellow. (...) (25 years ago, 5-Apr-00, to lugnet.cad.dat.parts)
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| | Re: Sphere Primitive
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(...) I suspected this problem when I reviewed the precision of all the circular primitives, which is why I left them alone at that time. But... I never went back to check thoroughly! Chris (25 years ago, 5-Apr-00, to lugnet.cad.dev)
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| | Re: Some Words To BFC
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(...) That's is the (Odd/Even) test, also with Raycasting, but no supersampling, in the supersampling case, you just subdivide the polys further and further, or shoot pseudo-random rays until you find the correct normals for all faces. this does NOT (...) (25 years ago, 5-Apr-00, to lugnet.cad.dev)
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| | Re: Some Words To BFC
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(...) Perhaps this approach is a bit naive, but couldn't you use something similar to a point in polygon test? Cast a ray along the normal from the center of each polygon. If it intersects an odd number of surfaces then the normal points toward the (...) (25 years ago, 5-Apr-00, to lugnet.cad.dev)
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| | Re: Some Words To BFC
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Leonardo Zide <leonardo@centroin.com.br> wrote in message news:38EB3EB8.D81D2C....com.br... (...) here, (...) Hey, this idea might work in conjuction with your program that fixes parts. If we had a parallel directory (/pi/?) with a copy of each (...) (25 years ago, 5-Apr-00, to lugnet.cad.dev)
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| | Re: Some Words To BFC
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(...) If you assume (which is correct for lego parts) that every *.dat file you use to define a part, belongs to a whole object (the part) which is a solid object (it should be) then you can say that any of those subfiles can have their faces (...) (25 years ago, 5-Apr-00, to lugnet.cad.dev)
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| | Re: Some Words To BFC
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(...) it. (...) the (...) not (...) checking (...) which (...) (Lines, (...) OK, Slowly ... A model-file always is BFC complient until it gets included and you don't know anything about it. But the root model can do what it likes, it will effect (...) (25 years ago, 5-Apr-00, to lugnet.cad.dev)
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| | Sphere Primitive
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Is it just me or the sphere primitives have non planar quads ? Or is the sphere distorted to allow for planar quads ? Why where the sphere done in this way instead of the usual (full quads with triangles on the poles) or (all triangles) ? I hope (...) (25 years ago, 5-Apr-00, to lugnet.cad.dev)
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