 | | CCW vs CW
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The (URL) Language Extension for Clipping (BFC)> states in the Parts Library Guidelines section that Primitives should always use CCW winding. However some of the primitives use CW, for example (URL) rect.dat>. Should these be rewritten? Would it be (...) (19 years ago, 12-May-05, to lugnet.cad.dat.parts.primitives, FTX)
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| | Re: Part requests: Lots and lots of parts
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(...) I have posted these parts on ldraw part tracker (URL) 44292.dat> (URL) 44308.dat> I plan to modelize the following parts (URL) Wheel Technic 14 x 70 mm Futuristic> + (URL) matching tire> (URL) BIONICLE claw> (URL) BIONICLE hook> (19 years ago, 4-May-05, to lugnet.cad.dat.parts, FTX)
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| | Re: Part 41770 certified but missing sub-file??
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(...) Doh! I thought I had already installed the latest parts update. My goof. (19 years ago, 28-Apr-05, to lugnet.cad.dat.parts)
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| | Re: Conditional lines on sloped wedge parts 43720 and 43721 [DAT]
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(...) Good idea with a twist primitive (twist.dat ?). Perhaps it would be simpler if it were only in one octant: 2 24 0 0 0 0 0 1 2 24 0 0 1 1 1 1 2 24 1 1 1 0 1 0 2 24 0 1 0 0 0 0 POV code would be: //x - yz = 0 quadric { <0,0,0>, <0,0,-1>, (...) (19 years ago, 27-Apr-05, to lugnet.cad.dat.parts)
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| | 6 sided string "primitive" with emphasis on primitive! [DAT]
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Since there was some discussion about this... I posted the 4 sided one here (URL) of these are very "good" as in high fidelity, they totally do not model that the string is 3 twisted cylindrical/toroidal shapes, but for black string they work pretty (...) (19 years ago, 26-Apr-05, to lugnet.cad.dat.parts)
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| | Re: Conditional lines on sloped wedge parts 43720 and 43721
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(...) Hey, thanks testing it out. You're right about the conditionals zig-zagging a bit. I still have the feeling that if the surface were pinned down to the concave green line those zig-zags would go away. But I couldn't decide whether to divvy it (...) (19 years ago, 26-Apr-05, to lugnet.cad.dat.parts)
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| | Re: Conditional lines on sloped wedge parts 43720 and 43721 [DAT]
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(...) The following are the appropriate conditionals for Don's surface. Playing with it you can have angles where the conditionals seem to go too far, but it's certainly much better than the current ones. (Note that the last 4 conditionals are only (...) (19 years ago, 26-Apr-05, to lugnet.cad.dat.parts)
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| | Re: Conditional lines on sloped wedge parts 43720 and 43721 [DAT]
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(...) Nice, I like the idea of the quadric primitive, but we want to add some curvature to the LDRAW version, right? I fiddled a bit with the part a few days ago, starting with the two triangles outlined by your primitive. I didn't exactly finish, (...) (19 years ago, 25-Apr-05, to lugnet.cad.dat.parts)
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| | Re: Conditional lines on sloped wedge parts 43720 and 43721 [DAT]
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(...) Looks good. Should we create a new primitive with the next dimensions:? 2 24 0 0 1 0 1 1 2 24 1 0 -1 0 1 -1 2 24 0 0 1 1 0 -1 2 24 0 1 1 0 1 -1 and a POV-quadric version in the coming L3PPARTS. As the outer twisted surface of the parts with (...) (19 years ago, 25-Apr-05, to lugnet.cad.dat.parts)
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| | Re: Part 41770 certified but missing sub-file??
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(...) I believe that is because s/41770s01.dat was certified and released in previous parts update (in this case 2004-04), and the parts tracker only displays dependencies that are currently on the tracker. This is not a problem, if the subpart has (...) (19 years ago, 25-Apr-05, to lugnet.cad.dat.parts)
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| | Part 41770 certified but missing sub-file??
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I recently downloaded the latest batch of parts from the LDraw Parts Tracker, and found three parts that were missing sub-files. Part 41769.dat & 41770.dat (Wing 2 x 4 Left/Right) both require sub-part s/41770s01.dat, but the sub-file isnt listed on (...) (19 years ago, 25-Apr-05, to lugnet.cad.dat.parts)
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| | Re: Conditional lines on sloped wedge parts 43720 and 43721
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(...) I have made a 43720.inc for the test of the coming L3PPARTS. The mathematical description of the surface is: 80x + 40y + yz = 0 and I have used the POV primitive quadric: quadric { <0,0,0>, <0,0,1>, <80,40,0>, 0 clipped_by { box { <-20,0,-40>, (...) (19 years ago, 25-Apr-05, to lugnet.cad.dat.parts)
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| | Re: Conditional lines on sloped wedge parts 43720 and 43721
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(...) I think the key difference is the twisted nature of this surface. I think the twist makes it impossible to partition the surface into polygons without having a mix of convex and concave seams. I'd like to be proven wrong. I don't have one of (...) (19 years ago, 19-Apr-05, to lugnet.cad.dat.parts, FTX)
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| | Re: Conditional lines on sloped wedge parts 43720 and 43721
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(...) Oh, I don't know about that 1 pixel business. The problem with the surface as it's currently written, is that it flip-flops between convex and concave every at every triangle. But if you ignore the triangles and spin the surface around a bit, (...) (19 years ago, 19-Apr-05, to lugnet.cad.dat.parts, FTX)
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| | Re: Conditional lines on sloped wedge parts 43720 and 43721
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(...) I'm pretty sure that's going to be the problem with *any* partition of this surface into polygons. Having a mathematical description of the surface would be good, because then we could potentially create a primitive for the surface, and (...) (19 years ago, 19-Apr-05, to lugnet.cad.dat.parts, FTX)
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| | Re: Conditional lines on sloped wedge parts 43720 and 43721
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(...) OK, I tried it and realise now that it doesn't solve the problem at all, just moves the outside curves to a different spot. I think Don is right, a more complex torus-like curve is necessary to represent it properly. ROSCO (19 years ago, 18-Apr-05, to lugnet.cad.dat.parts, FTX)
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| | Re: Conditional lines on sloped wedge parts 43720 and 43721
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(...) Well, I thought about this, and what I would try is changing the polygons thus: If the top points are A1-5 and the bottom points are B1-5, keep the A2-B1, A3-B2 as currently, but instead of A2-B2 etc, use A3-B1, A4-B2, etc. I think that would (...) (19 years ago, 18-Apr-05, to lugnet.cad.dat.parts, FTX)
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| | Re: Conditional lines on sloped wedge parts 43720 and 43721
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(...) I'm not sure about that. The surface as it's written is extremely lumpy, and the conditional lines work as expected given the lumps in the surface. You also get an ugly shading effect with flat shading because of those lumps. (URL) There's (...) (19 years ago, 18-Apr-05, to lugnet.cad.dat.parts, FTX)
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| | Re: Conditional lines on sloped wedge parts 43720 and 43721
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(...) I don't think it's the control points. I took a quick look at the file, actually just one of the lines, the first in the file. The control points used are the two unattached vertices from the triangles adjacent to the conditional edge. That (...) (19 years ago, 18-Apr-05, to lugnet.cad.dat.parts, FTX)
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| | Conditional lines on sloped wedge parts 43720 and 43721
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Wedge part 45407 (Wedge 4 x 4 with 1 x 4 Side Plates) has similar sloped sides as wedge parts 43720 and 43721 [LDrawPart 43721]. When I examined these parts in LDView, I noticed that the control points for the conditional lines on the sloped surface (...) (19 years ago, 16-Apr-05, to lugnet.cad.dat.parts, FTX)
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