[LSC] BFC Standard - Revision 1

[Travis Cobbs]

The exception text should be moved up into the paragraph that talks about
not using BFC unless all parents are certified.  (Actually, we should reword
it to fit into that paragraph naturally.)

--Travis

On 10/22/06, William Howard <william at howard-family.fsworld.co.uk> wrote:
>
> OK,
>
> I've just found this in the standard "One important special case is this:
> part files are never inverted. Parts are complex files which would be
> essentially useless if they were inverted. Assuming part files are never
> inverted allows the rendering engine to apply BFC-processing on certified
> parts, even if the calling files (i.e., the main model file(s)) aren't
> certified."
>
> So at one point we are saying that a sub-file can't be culled if it's in a
> non-certified super-file, but at another point of the standard we are
> saying
> that we can.
>
> Confused?  You will be!
>
> -----Original Message-----
> From: lsc-bounces at ldraw.org [mailto:lsc-bounces at ldraw.org] On Behalf Of
> William Howard
> Sent: 22 October 2006 10:30
> To: 'LDraw Standards Committee'
> Subject: RE: [LSC] BFC Standard - Revision 1
>
>
> > On the matter of culling parts even if the super-file isn't certified
> ...
> Thinking some more about this, this *has* to be incorrect.  If it was
> correct that you can't BFC a subfile unless the superfile is certified,
> hardly any models would ever be rendered with  culling applied as the main
> model file is almost never BFC certified.
>
> I was thinking that perhaps the criterion is if the superfile contains
> polygons, but that also can't be true as some of my model files contain
> raw
> rects and tris to create arrows (and they render correctly in LDView which
> Travis says performs back face culling regardless).
>
> So, we seem to have a case that back face culling can be applied if the
> main
> model file or a part file within a superfile is certified.
>
> The problem seems to be with the definition of the term "current reference
> branch" - which is used in the definition of culling (under Language
> Extension Functionality) but never defined itself.
>
> (The terms "file-reference tree", "file-reference branch" also need
> sorting
> out)
>
>
>
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