[Bf-committers] GSoC 2018: Layer Painting Proposal

[Cheryl Chen]

Thanks for the insight, Kévin!
Oh right, I didn't really consider how the data would be saved so that a
user can continue painting over multiple sessions. It does seem most
straightforward to save everything in the .blend file, though that could
result in really big .blend files. Perhaps a layer unpacking feature,
similar to texture unpacking, could be useful for reducing .blend file size
after a user is done painting, but I'll have to look more into how external
data packing works.

Also thanks, Yury, for the suggestion!
That sounds like multi-layer painting, but also with some presets -- maybe
like a simple version of Substance Painter's material library? I'm focusing
more on getting the basis of layer support implemented in my project, but
that is a feature I would really like to add later on, maybe even after
GSoC. I'll have to see how it goes!

Best,

Cheryl

On Mon, Mar 26, 2018 at 6:53 AM, Yury Baranov <cucumberer at gmail.com> wrote:

> Hi, Cheryl Chen!
> Also, with new Eevee engine, you should consider making "material painting"
> which means simultaneous painting on multiple bitmaps with different
> colors.
> For example, "paint with shiny copper metal" means:
> - paint copper-red color in albedo/basecolor channel
> - paint white color in metalness channel
> - paint black color in roughness channel
> All at the same time.
> That will be really cool feature, and very close to your initial proposal.
>
> 2018-03-26 0:00 GMT+03:00 Kévin Dietrich <kevin.dietrich at mailoo.org>:
>
> > Le 2018-03-23 00:28, Cheryl Chen a écrit :
> >
> > > Thank you for the support, Ricardo, and thanks for the feedback, Kévin!
> > > I hadn't really considered how to deal with the performance issues, and
> > > your diff is a really helpful reference as well. May I ask what other
> > > difficulties you encountered while working on this feature? It may be
> > > because of time constraints and changes to the Blender codebase, but it
> > is
> > > a bit concerning that a fair bit of work has gone into building layer
> > > support (seeing that there also was a GSoC project in 2010), and it
> > hasn't
> > > really been completed yet. It will be really helpful to gain some more
> > > insight, as I may be approaching this task too naively...
> > >
> > > Best,
> > > Cheryl
> > > _______________________________________________
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> >
> > Performance was the main issue during the various implementation
> > efforts. Then there is also the case of how to save layer data as
> > Blender does not save images currently. However, in the diff, this
> > behavior was changed such that image data and layers are saved to .blend
> > files. So performance and I/O are the important bits.
> >
> > Regards,
> >
> > Kévin.
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