[Bf-viewport] Ghosting

[Joshua Leung]

Hi Hadrien,

The bottleneck for drawing onionskins for geometry has never really been
*drawing* the geometry, but rather, *evaluating the rigs + geometry* for
each of the frames shown. In that sense, Blender's lack of this thus far
has really been more of a "technically-not-feasible" problem vs "we don't
want to have this feature".

With the projects planned/in-development for 2.8, this should hopefully
become more feasible. In particular, the changes to how data is evaluated
(i.e. on copies instead of on the original datablocks) should in theory
allow us to spawn extra copies of the geometry data in the background to
calculate everything quicker. Or, perhaps we may finally consider just
caching modifier-deformed geometry for quicker playback in the viewport
(and get onion-skinning almost "for-free" that way).

Of course, whether all this actually works like this is still to be seen -
e.g. I'd still like to check on how we can optimise motionpath calculations
by using partial depsgraph updates (and on a background/internal copy of
the data).

Cheers,
Joshua


On Sat, Jul 22, 2017 at 10:47 PM, Hadrien Brissaud <hadriscus at gmail.com>
wrote:

> Hi Clément, apologies for being vague. It's like onion skinning (grease
> pencil), but for 3d characters, which I imagine makes it that much more
> expensive to draw. Example : https://www.youtube.com/watch?v=5DVUEtLAuiU
> It is probably not something I would use in a full-blown engine like Eevee,
> but something more simple like Clay, or an even simpler silhouette drawing.
> Current Blender can display ghosts of bones (in armature settings), and
> although it gives some indication of movement, bones rarely reflect
> accurately the silhouette of characters (http://pasteall.org/pic/
> index.php?id=117451).
> There is another example : https://www.youtube.com/watch?v=sG6wXX7nAvQ
> This one seems to take a snapshot of the silhouette in screen space, looks
> nice from camera view but I imagine you cannot tumble around the scene
> without breaking the effect.
>
> Cheers,
>
> Hadrien
>
> On 22 July 2017 at 03:15, Clément FOUCAULT <foucault.clem at gmail.com>
> wrote:
>
>> Hi Hadrien,
>>
>> Could you be more precise? Is this a feature of 2.79? Have a screenshot
>> for me to understand?
>>
>> Thanks.
>>
>> 2017-07-22 0:06 GMT+02:00 Hadrien Brissaud <hadriscus at gmail.com>:
>>
>>> Hi all,
>>>
>>> don't know if it's planned but haven't read about it : is the new
>>> viewport capable of handling geometry ghosting ? For onion skinning in
>>> animation, it's pretty useful.
>>>
>>> Cheers,
>>>
>>> Hadrien
>>>
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