 | | Re: Maximum depth of ldraw models?
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(...) Okay... 15% speedup is substantial... that means that it's better to pre-transform the subfiles when generating the operations for the current file. I won't worry about the maximum depth any more then. (...) How does a renderer know which (...) (18 years ago, 7-Sep-06, to lugnet.cad.dev)
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| | Re: Maximum depth of ldraw models?
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(...) Same here for LDView. LDView always flattens part geometry, and this seems to improve performance enough to be noticed. LDView does use a display list for each part, and a nested display list for each nesting level above that (as long as you (...) (18 years ago, 7-Sep-06, to lugnet.cad.dev)
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| | Re: Maximum depth of ldraw models?
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(...) MPD files don't add that many extra levels... usually only 2, isn't it? Further, the only stacking that generally needs to occur at the mpd level is modification of the modelview matrix, which opengl guarantees a minimum of 32. It's only in (...) (18 years ago, 7-Sep-06, to lugnet.cad.dev)
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| | Re: Maximum depth of ldraw models?
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(...) I tested the performance of, and saw a decent gain from flattening part geometry. (Perhaps 15% in BrickDraw3D for QuickDraw3D or OpenGL.) What this means is that when a part is prepared into a drawing list, it is not a list of calls to (...) (18 years ago, 7-Sep-06, to lugnet.cad.dev)
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| | Re: Maximum depth of ldraw models?
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(...) As far as building instructions go, LPub only provides for unique background color/backdrop for up to four levels. This is about as much as I've ever seen in LEGO building instructions. The renderers take care of nesting within individual part (...) (18 years ago, 7-Sep-06, to lugnet.cad.dev)
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| | Re: Maximum depth of ldraw models?
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(...) Hmm. I use MPD models a lot, there can be several levels of nesting within a single .mpd file, and I have been known to refer to .mpd files from other .mpd files. I'm not sure how deep my nesting of model files goes, but I'd be a little (...) (18 years ago, 6-Sep-06, to lugnet.cad.dev)
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| | Maximum depth of ldraw models?
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I notice that no maximum depth is given by the standard. How potentially non-compliant would a renderer be if it fails because parts in a model are too deeply nested (a maximum of as little as 16 on some OpenGL implementations). I notice that no (...) (18 years ago, 6-Sep-06, to lugnet.cad.dev)
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| | Re: What does a subpart with color=24 mean?
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(...) Well, one that I have gives a warning message that says it can't handle color 24 and substitutes 16 for such lines. But I wasn't sure if that was correct behaviour. Another one that I've played with quietly accepts such lines, but appears to (...) (18 years ago, 5-Sep-06, to lugnet.cad.dev)
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| | Re: What does a subpart with color=24 mean?
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(...) Actually, that grep doesn't return anything. '^[ \t]*1 24' does return hits from three files, though. Every single place in the library that this is used, it's used in a reference to one of the edge primitives. The edge primitives use color 24 (...) (18 years ago, 5-Sep-06, to lugnet.cad.dev)
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| | Re: What does a subpart with color=24 mean?
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(...) In the case of some kind of direct color, I guess the rendering program is free to do whatever it wants. The simplest action would be to default to black (either LDraw 0, or RGB #000000). I'd be interested to hear what actual rendering (...) (18 years ago, 5-Sep-06, to lugnet.cad.dev)
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