LDraw.org Discussion Forums
Skewing in official parts - Printable Version

+- LDraw.org Discussion Forums (https://forums.ldraw.org)
+-- Forum: Models and Parts (https://forums.ldraw.org/forum-18.html)
+--- Forum: Parts Authoring (https://forums.ldraw.org/forum-19.html)
+--- Thread: Skewing in official parts (/thread-13690.html)

Skewing in official parts - Roland Melkert - 2014-08-14

As a result of this thread, I'm wondering are there any parts in the library using skewing (of base scaled reference), is it even legal?

I need to know to decide if it's worth the needed rewrites to my texmap meta implementation.

Re: Skewing in official parts - Magnus Forsberg - 2014-08-14

Deformation of primitives a is very common practice:
but I can't remember ever seeing it on a part.

Re: Skewing in official parts - Tim Gould - 2014-08-14

I think I've used it before, but couldn't tell you on what part. I just vaguely remember working out the skewing matrix sometime in the past.

Perhaps the texmap extension could demand no skewing. I can't see it being useful in more than a tiny fraction of cases, and even then it might be more trouble than it's worth since the texture would have to contain unskewing to look OK.


Re: Skewing in official parts - Philippe Hurbain - 2014-08-15

I am pretty sure I used it... Dunno where!

Re: Skewing in official parts - Travis Cobbs - 2014-08-15

I have a vague recollection of having seen a skewed sphere primitive in some official part, but I could be wrong about that.

Re: Skewing in official parts - Roland Melkert - 2014-08-16

Thanks guys,

It's only a problem when the skewed referenced part uses local TEXMAP info. And I'm guessing the skew usages are mostly for the general shaping of stuff which then might be mapped on a higher level, thus nullifying the problem.

Anyway I decided to not change my current approach until some part actually needs it, as the solution will slow down calculations for all other usage.

Re: Skewing in official parts - Mark Kennedy - 2014-08-18

The skewing of box primitives should be fine and I think that some of the windshield parts may use skewed cylinders.