No, the hair segments face the camera,
the motion vectors follow their XYZ axis. However motion vectors is a 2d
image anyways..
Only a few people have written a 3d motion vector one that works. (there's
a lot more technical detail behind it
and i'm sure somebody can explain it) Ussually people just use the "bounding
box" .
I think there's a white paper from Siggraph about it, can't remember
O.
----- Original Message -----
From: "kim aldis" <xsi(at)kim-aldis.co.uk>
To: <XSI(at)Softimage.COM>
Sent: Friday, October 26, 2007 12:15 PM
Subject: RE: 2d motion blur on hairs
-----Original Message-----
From: owner-xsi(at)Softimage.COM [mailto:owner-xsi(at)Softimage.COM] On
Behalf Of Oliver Heijmans
Sent: 26 October 2007 16:23
To: XSI(at)Softimage.COM
Subject: Re: 2d motion blur on hairs
Only with custom shaders..
Mental ray hair, is not 3d, it's 2d planes..
So has vector information that faces the camera at all times.,..
[kim:-]
Motion vectors face the camera?
My own feeling is that even if it were possible,which it may be, the fine
detail in the hair would make it give mostly unacceptable results.
Remember,
there's only one motion vector per pixel but there will be the shaded
results of many hair strands under a single pixel.
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