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1-16chrd, an interesting idea... - Printable Version

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RE: 1-16chrd, an interesting idea... - Chris Dee - 2018-12-02

(2018-11-17, 22:19)Travis Cobbs Wrote:
(2018-11-17, 19:23)Willy Tschager Wrote: +1

w.

FYI, as far as I know, I no longer have the ability to edit those files. I used to, but there aren't any "edit" links any more (and probably haven't been for years).

The primitives reference is not, and never has been, part of the ldraw.org Content Management System. It is still a bunch of html files with a lot of Server-Side-Includes.
If someone can provide some extra usage text for 1-16chrd, I'm happy to add it.


RE: 1-16chrd, an interesting idea... - Travis Cobbs - 2018-12-03

I really don't know how to describe this in a way that makes sense. The following is the best I could come up with.

Note: 1-16chrd.dat is a special case that is used on the inside of a curved primitive where it joins geometry that cannot make use of a curved primitive. The primitive file itself is simply a reference to empty.dat, which under normal circumstances does not draw anything. However, in tools that support primitive substitution, the curved primitive it is attached to would normally in this case create a gap when rendered using more than 16 points to form a circle. In that case, the substituted version of this normally empty primitive would fill in the gap between the curve and the other geometry.


RE: 1-16chrd, an interesting idea... - Chris Dee - 2018-12-03

(2018-12-03, 5:49)Travis Cobbs Wrote: I really don't know how to describe this in a way that makes sense. The following is the best I could come up with.

Note: 1-16chrd.dat is a special case that is used on the inside of a curved primitive where it joins geometry that cannot make use of a curved primitive. The primitive file itself is simply a reference to empty.dat, which under normal circumstances does not draw anything. However, in tools that support primitive substitution, the curved primitive it is attached to would normally in this case create a gap when rendered using more than 16 points to form a circle. In that case, the substituted version of this normally empty primitive would fill in the gap between the curve and the other geometry.

Thanks - primitives reference updated.


RE: 1-16chrd, an interesting idea... - Philippe Hurbain - 2018-12-03

(2018-12-03, 5:49)Travis Cobbs Wrote: I really don't know how to describe this in a way that makes sense. The following is the best I could come up with.
Thanks Travis - difficult to explain indeed, that's why I didn't chime in.

Primref is also missing an entry for related ering primitives (1-4ering, 4-4ering). Something like "Several 1-16chrd placed around a circle, used to fill-in gaps between simple geometry and curved primitives during primitive substitution. See 1-16chrd for more details."


RE: 1-16chrd, an interesting idea... - Willy Tschager - 2018-12-04

(2018-12-03, 5:49)Travis Cobbs Wrote: I really don't know how to describe this in a way that makes sense. The following is the best I could come up with.

Note: 1-16chrd.dat is a special case that is used on the inside of a curved primitive where it joins geometry that cannot make use of a curved primitive. The primitive file itself is simply a reference to empty.dat, which under normal circumstances does not draw anything. However, in tools that support primitive substitution, the curved primitive it is attached to would normally in this case create a gap when rendered using more than 16 points to form a circle. In that case, the substituted version of this normally empty primitive would fill in the gap between the curve and the other geometry.

Thank you Travis! ... Much appreciated.

w.


RE: 1-16chrd, an interesting idea... - Magnus Forsberg - 2018-12-20

Chris,
Could we please have this on the primref too?

(2018-12-03, 8:22)Philippe Hurbain Wrote: Primref is also missing an entry for related ering primitives (1-4ering, 4-4ering). Something like "Several 1-16chrd placed around a circle, used to fill-in gaps between simple geometry and curved primitives during primitive substitution. See 1-16chrd for more details."



RE: 1-16chrd, an interesting idea... - Willy Tschager - 2020-03-11

The note for "ering" is still missing. You should also explain how to handle "invisible" geometry in an editor: working with "chrd" and after postioning, bfc, ... renaming to "ering". I'm sure you come up with some clever wording.

w.


RE: 1-16chrd, an interesting idea... - Philippe Hurbain - 2020-03-11

(2020-03-11, 14:32)Willy Tschager Wrote: working with "chrd"
...or ndis. Often chrd comes over existing faces geometry and is not seen much better.