I think Rob is right on this one - replacing the sprite shader with a
constant should work (crank up the raydepth!) and should not affect the look
of the volume
the reason this happens is that the sprite shader is a bit of a hack: it
resets the raycount when a ray enters it - so you get proper transparency
for endless overlapping sprites without having to increase the raydepth -
but it can create problems such as this one where volumes don’t work well
with the sprite shader.
-----Original Message-----
From: adrian wyer
Sent: Friday, March 13, 2015 4:54 PM
To: softimage@listproc.autodesk.com
Subject: RE: baVolume fog pass with sprites
sprite shader on rectangle particles, using original people alphas as
cutouts
works fine in beauty, but not as hold out with the volume
tried different volume shaders (basic fog and such) get the same incorrect
render... put it down to something the sprite shader is doing with
transparency rays
in then end i will live without the people in the volume pass, as the final
comp is degraded to look like a 1940 b&w photo
a
-----Original Message-----
From: softimage-boun...@listproc.autodesk.com
[mailto:softimage-boun...@listproc.autodesk.com] On Behalf Of Rob Chapman
Sent: 13 March 2015 15:22
To: softimage@listproc.autodesk.com
Subject: Re: baVolume fog pass with sprites
oof. which shaders you tried for the sprites? constant shader, sprite
or card/opacity .?
1 of them should work. if you are using physical light or sky for
rendering you may have to crank up some values in the sprite shader to
10k
to get them to work as it should
On 13 March 2015 at 14:50, adrian wyer <adrian.w...@fluid-pictures.com>
wrote:
hi guys, trying to render a non homogenous fog pass for a shot, that has
sprite shader cut outs of people on particle cards
getting a very odd render result where the people are lighter than the
surrounding fog!
anyone seen this and found a solution?
ideally don't want a solution that changes the RGB as the client has
signed
it off!
thanks
a
Adrian Wyer
Fluid Pictures
75-77 Margaret St.
London
W1W 8SY
++44(0) 207 580 0829
adrian.w...@fluid-pictures.com
www.fluid-pictures.com
Fluid Pictures Limited is registered in England and Wales.
Company number:5657815
VAT number: 872 6893 71
