LDraw file generation

[Ed Bardet]

(Note that your images didn't show up for some reason. So I'm not sure I understand what you did.)

I can't find any posts in this thread stating what I italicized above. Both Roland and I stated that each part has its own origin, and I stated that the origin is not likely to be in the center of the part. Roland stated that the matrix is applied relative to the origin of the referenced part. To the best of my knowledge, all of these things are true.

Each LDraw file (be it a primitive, a sub-part, a part, a sub-model, or a model) has its own coordinate system. Aside from the top-level model, that coordinate system is modified by the matrix in the type 1 line that specifies the sub-file. Based on what you say, it sounds like the LDraw file generated by Stud.io is in MPD format and contains sub-files. I can't see any other way that rotating one brick could rotate "the rest of the wall". If that is the case, then the matrix that is applied to that sub-file accomplishes the rotation, and all of the contents of that file would then be un-rotated internally.

I think I get what you mean.It's internally making a sub-model based on the stud selected and connectivity data, rotating and then releasing the sub-model. That would explain how. But the resulting exported file is ldraw type one entries, so I'm probably on the right track.