 | | Re: Checking 48\1-4ring4.dat
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(...) My code matches your code exactly. Could you submit your file to the tracker? But please add an Author line for Sascha, he gets first-mover props. Steve (22 years ago, 19-Apr-02, to lugnet.cad.dev)
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| | Re: Checking 48\1-4ring4.dat [DAT]
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(...) Yes, I agree. My Excel spreadsheet created file is varying by 0.0001 to 0.0002. Paul 0 Hi-Res Ring 4 x 0.25 0 Name: 48\1-4ring4.dat 0 Author: Paul Easter 0 Unofficial Primitive 0 BFC CERTIFY CW 4 16 4 0 0 3.9658 0 0.5221 4.9572 0 0.6526 5 0 0 (...) (22 years ago, 19-Apr-02, to lugnet.cad.dev)
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| | Re: Why Type 5 Lines?
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(...) Actually, transparent surface should work fine. As long as they are set to write to the Z buffer when drawn, and their outlines are drawn with Z buffer testing enabled, they should work fine. The wireframe parts that aren't supposed to be (...) (22 years ago, 18-Apr-02, to lugnet.cad.dev)
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| | Re: Why Type 5 Lines?
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(...) One problem: transparent surfaces would show the wireframe backside. :\ Steve (22 years ago, 18-Apr-02, to lugnet.cad.dev)
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| | Re: Why Type 5 Lines?
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I was reading through this more, and while I still don't know exactly how it all works, I think I stumbled onto something. > I dont know how many of you have come across this technique before. I > remember finding an OpenGL demo that did this kind (...) (22 years ago, 18-Apr-02, to lugnet.cad.dev)
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| | Re: Why Type 5 Lines?
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(...) Yeah, the stencil buffer, that's gotta be it. If you've got BFC working then you can use the stencil buffer to count how many times an edge is draw in GL_LINE mode. Edges on back facing triangles won't be drawn, so you'll only count one edge (...) (22 years ago, 18-Apr-02, to lugnet.cad.dev)
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| | Re: Why Type 5 Lines?
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(...) That sounds like glPolygonOffset which would be part of the solution because it allows the edges to look clean. We all use that already. (...) I can see how you might accomplish some of that by manipulating glEdgeFlag when you define your (...) (22 years ago, 18-Apr-02, to lugnet.cad.dev)
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| | Re: Why Type 5 Lines?
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(...) OpenGL has glPolygonOffset, which does what you describe by allowing you to move the polygons further away in the Z direction, where the amount they move can depend on the slope of the polygon in the Z direction. This works great, and I use it (...) (22 years ago, 17-Apr-02, to lugnet.cad.dev)
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| | Re: Why Type 5 Lines?
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(...) The obvious case where it's useful is studs - without these lines, viewing any brick from the standard "oblique" position above & to the side, you would see a circle at the top & bottom of each stud, but no sides, which IMHO would not look (...) (22 years ago, 17-Apr-02, to lugnet.cad.dev)
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| | Re: Why Type 5 Lines?
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(...) Well, I believe that there is something called a 'Z offset' that can be used not to actually move the geometry, but to make sure the lines appear 'on top' of the faces. Before I go more into this I need to back up a bit. I currently use the (...) (22 years ago, 17-Apr-02, to lugnet.cad.dev)
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| | Re: Why Type 5 Lines?
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(...) I'm curious to. Everything I know about how OpenGL works says that drawing the strip as a wireframe after drawing it solidly would either produce Z Buffer noise, no wireframe at all, or wireframe all over. However, it may be that there is some (...) (22 years ago, 17-Apr-02, to lugnet.cad.dev)
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| | Re: Why Type 5 Lines?
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(...) Tell more about this. I just tweaked a version of ldview to display type 5 lines, but only for surfaces that haven't been replaced by quad strips. It looks good with primitive substitution turned off, but with this automagic wireframing of (...) (22 years ago, 17-Apr-02, to lugnet.cad.dev)
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| | Re: Why Type 5 Lines?
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(...) I believe that there are other ways to put these lines in, as long as you are *only* planning on using them to show the 'visible' edge of a curved surface. This is actually a question I've been meaning to ask around here, Have type5 lines been (...) (22 years ago, 17-Apr-02, to lugnet.cad.dev)
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| | Re: Why Type 5 Lines?
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(...) On the contrary, I think that type-5 lines are very useful, and an interesting solution. They are a nice way to make sure that rounded objects are outlined with a contrasting colour, no matter where the viewpoint is. The rendering of cylinders (...) (22 years ago, 17-Apr-02, to lugnet.cad.dev)
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| | Re: Why Type 5 Lines?
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(...) I'm not sure how to quantify 'usefulness' of a line command. If you want to make outlines on simulated curved surfaces in LDraw, conditional lines are vital. I can't think of another to accomplish this task. And making the outlines is fairly (...) (22 years ago, 17-Apr-02, to lugnet.cad.dev)
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| | Why Type 5 Lines?
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What is the point of Type 5 lines? It seems to me that they are a confusing and clunky method to display lines for the visible edges of rounded objects when having no line at all would be just as visually correct (and less taxing on the brain to (...) (22 years ago, 17-Apr-02, to lugnet.cad.dev)
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| | Re: Question about DAT rendering
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(...) Err, not really. (...) Nod, you should be able to reorder without running into trouble. Steve (22 years ago, 16-Apr-02, to lugnet.cad.dev)
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| | Re: Question about DAT rendering
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(...) Well, on the Mac at least, the only hardware at the moment that supports two sided lighting are the GeForce3, GeForce4 and the new Radeon 8500. Everything else is going to use software T&L. My take on getting the shading to look right has been (...) (22 years ago, 16-Apr-02, to lugnet.cad.dev)
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| | Re: Question about DAT rendering
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(...) Hey, I happen to *like* my default shading settings. ;-) I agree with you on the speed issue though... (...) I'm curious, do you have any numbers on how much slower it is on accelerated hardware to do two sided lighting with GL_FRONT_AND_BACK? (...) (22 years ago, 16-Apr-02, to lugnet.cad.dev)
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| | Re: Question about DAT rendering
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Ken, We are obviously in the same area the moment. After completing the conversion of LdGLite to run under MacOS 8.6-9.2 (ie LdGLite (Mac)), I turned my attention to the two biggest dissapointments to me, namely slow render speeds and quirky shading (...) (22 years ago, 16-Apr-02, to lugnet.cad.dev)
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