[Bf-funboard] Freestyle into Blender: Howto?

[Stéphane Grabli]

Thanks to all of you for your ideas and comments!

I still need to get more familiar with Blender to fully
evaluate the different options suggested here, but
as far as my understanding is currently going, and based
on your answers, I would say that it makes sense
to integrate Freestyle as another renderer whose output would
be composited in raster space.

In any case, it's certainly possible to display the outlines
in the opengl viewport, for preview purposes,
as some geometry living in image space, on top of whatever
else is there.

To answer Jason's following concern:
"I'm not sure how it would work as my
understanding of Freestyle is that it applies itself to the scene as a
whole. "
It's true that the information is computed on the whole scene (visibility is
a good
example of an information that can't be computed separately per object),
but that doesn't prevent from localizing the stylization by applying shaders
on
a per object (or group of objects) basis (even if it's not currently working
like that),
as long as they all use the same information.

I hope my lack of knowledge of blender doesn't make me misunderstand
the ideas proposed here, but in any case, I'll make sure to carefully read
them again
when I know blender better :-)

Thanks again!

Stephane

On 3/9/07, Michael Crawford <psyborgue at mac.com> wrote:
>
>
> On Mar 9, 2007, at 12:32 AM, Doug Ollivier wrote:
>
> > Yep, and the advantage of this is the thickness of the wires
> > changes as you zoom out..... (which can be desirable in  many
> > situations... or not)
> >
> > It is also how the Maya toon edges, and some other modifiers can be
> > done.
>
> I know Maya uses geometry in the viewport to preview, but when it
> renders, it uses paintEffects which can be either a true 3d effect,
> or a 2.5d effect (in which case, it's not geometry at all, but a 2d
> brushtroke with depth).   Paint effects can do all sorts of things,
> like smudge or clone along a path... so it's not just 3d.
>
> In any case, Matt's idea sounds great, if freestyle can be integrated
> in such a manner.
>
> > Very nice idea Matt
> >
> > Matt Ebb wrote:
> >> On 3/8/07, *Stéphane Grabli* <stephane.grabli at gmail.com
> >> <mailto:stephane.grabli at gmail.com>> wrote:
> >>
> >>     Ideally, since Freestyle only produces contour lines
> >> (currently as
> >>     2D triangle strips living in image space), its output
> >>     would easily be composited (in a way or another) to other
> >>     rendered elements such as shadows, objects interiors etc.
> >>
> >>
> >> Here's another idea, since freestyle is actually creating
> >> geometry, what if it was actually done as a modifier? It could do
> >> exactly the same thing, generating geometry (and vertex colours/
> >> UVs?) aligned to the camera view vector. The cool thing about it
> >> being a modifier is that you'd be able to preview how it would
> >> look in the 3D View, and it would be really there, not just a
> >> shading effect, so you could layer other modifiers on top, it
> >> could cast shadows, etc.
> >>
> >> Something to think about...
> >>
> >> Matt
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