[X3D-Public] Support for submeshes?

[Tony Parisi]

Yeah but nearly all good engines state-sort anyway, they can sort their
operations based on appearance. I don't think it should be that cumbersome
a design within the X3D. Like everything else it should be fairly
straightforward and somewhat human readable. I know that's a bit oxymoronic
when it comes to 3D formats but VRML/X3D always did a pretty good job in
that regard.

As a straw-man I would do something simple like multiple Shape nodes in a
single group, with one Coordinate node to rule them all.

Tony

On Tue, Feb 5, 2013 at 3:53 PM, Michalis Kamburelis <
michalis.kambi at gmail.com> wrote:

> Keith Victor wrote:
>
>> That general approach was a bit messy.  I would have preferred that they
>> specify the transition between the appearances, so it forces the author
>> to place all the triangles ( or Faces ) that share the same appearance
>> to be next to eachother. ( so the renderer does not have to do so )
>>
>
> That would be my preference too --- to keep faces with the same appearance
> together. Otherwise, browsers will have to reorder the faces first, for
> efficient rendering. Which may be time-consuming and troublesome (it
> depends on how much dynamic we allow there, but since IndexedFaceSet has
> set_coordIndex event then I guess we will want to also allow to change the
> appearance assignment at runtime).
>
>
>  MFInt32 appearanceTransition  (index of the Face where we transition to
>> the next appearance )
>>
>>
> Instead of specifying the transition index, it could be more consistent to
> follow what existing TriangleFanSet.fanCount and
> TriangleStripSet.stripCount fields do (http://www.web3d.org/files/**
> specifications/19775-1/V3.2/**Part01/components/rendering.**
> html#TriangleFanSet<http://www.web3d.org/files/specifications/19775-1/V3.2/Part01/components/rendering.html#TriangleFanSet>,
> http://www.web3d.org/files/**specifications/19775-1/V3.2/**
> Part01/components/rendering.**html#TriangleStripSet<http://www.web3d.org/files/specifications/19775-1/V3.2/Part01/components/rendering.html#TriangleStripSet>).
>
> So a field like
>
>   MFInt32 appearanceCount
>
> For example
>
>   appearanceCount [ 44, 123, 456 ]
>
> means that first 44 faces use the first appearance, the next 123 faces use
> the 2nd appearance, the next 456 faces use the 3rd appearance.
>
> Michalis
>
>
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