Hi Jeff,
I dont completly understand what you mean with "chunks of
the object flash from
grey to the vector color. I think it depends on if it's moving or
not." but i found that mv framebuffer are kind of a lens shader. I had
problems with a scene where only the moving objects were rendered in
the mv framebuffer but then i turned on lens shaders and everything
rendered correctly: the moving objects with the motion info and the
static with the purple color.
The unpremultiplied output is really simple to correct, but i think it
would be nice if we could skip that step: i don't know if somebody
needs a motion pass without the alpha premultiplied for something, but
i think most of the people dont.
And the offset thing is really weird, i use the motion framebuffer all
the time and never had and offset, even with deforming objects. In
that particular case i think you need to contact Softimage directly.
Orlando.
On Nov 6, 2007 9:38 AM, Jeff <jeff(at)magneticdreams.com> wrote:
>
> You are supposed to be able to use the motion framebuffer instead of
> rendering another pass with a MV shader. However we are in the same
> situation as you. We moved to XSI 6.5 from 5.11 because we were tired of
> paying for the maintenance and not using the latest software. So in the last
> project I used the framebuffers for motion. They work somewhat, but it does
> not kick out an alpha (the bg is grey) and chunks of the object flash from
> grey to the vector color. I think it depends on if it's moving or not. I'm
> about to send Softimage an email about this, but I did find a few
> workarounds.
>
> Kick out the motion buffer as 16bit SGI.
> I had to use After effects for comping, and the realsmart motion blur
> plugin works with the motion framebuffer. But you have to precomp it and
> apply the color channels alpha to the vectors. Also to fix the grey blocks
> appearing, I used primatte to mask out the grey color, and put a purple
> solid that matches the motion vector color when it's not moving. This is a
> ridiculous workaround to something that should be working!
>
> In the end it worked but it was so much work, we are thinking about moving
> back to 5.11.
>
>
> -Jeff
>
>
>
>
> Daniel Jahnel wrote:
> hi everyone...
>
> [Rant_start]
> so we're giving 6.5 a chance here now...first thing i try is motionblur.
> motionvectors dont seem to work properly, i always get some offset in my
> motionvector pass in comparison to the beauty pass, even if i set shutter to
> "end on frame". if i set speed to 0 it works but i dont get any
> vectors...great. how am i supposed to use these settings?? its completely
> confusing that you have a shutter speed in the renderer and some dubios
> shutter-open-close parameters in the scene...why is motionblur always a pain
> in xsi?? for many versions its just constantly broken and unusable at times
> and one always has to fight it....dont people use motionblur?? back to
> reprojecting then...
> [Rant_end]
>
> Daniel
>
> ---
> Unsubscribe? Mail Majordomo(at)Softimage.COM with the following text in body:
> unsubscribe xsi
>
>
>
>
>
> --
>
>
>
>
>
> Jeff Greulich
> Senior 3D Modeler/Texturer
>
>
>
> Magnetic Dreams Animation Studio, Inc.
> 2525 Lebanon Pike, Building C. Nashville, TN 37214
> Ph 615.885.6801 | Fx 615.889.4768 | www.magneticdreams.com
> jeff(at)magneticdreams.com
>
> Confidentiality Notice: This email, including attachments, is confidential
> and should not be used by anyone who is not the original intended
> recipient(s). If you have received this e-mail in error please inform the
> sender and delete it from your mailbox or any other storage mechanism.
> Magnetic Dreams, Inc cannot accept liability for any statements made which
> are clearly the sender's own and not expressly made on behalf of Magnetic
> Dreams, Inc or one of its agents.
>
>
---
Unsubscribe? Mail Majordomo(at)Softimage.COM with the following text in body:
unsubscribe xsi
