Some issues with motionblur between arnold and TP. If we need to use it one day for cinema, this is not usable right now:
I
have a box animated doing a sinus curve over time, very fast. If I
render that in Vray, with a slow shutterspeed, enough motionblur
samples, I get a nice curved motion blur. Doing the same in Arnold the
same, nice curved motionblur (we need to have nice motionblur, most of
the time is the only thing you see, when we have sparks, we need
curvature, etc.. etc..)
Now the problem:
We go to TP, we
import this box as a particle, tracking the animation (the most simple
thing we can do in TP), add enough subsamples on TP, and we render this
on Vray, is fine, again, nice motionblur, Vray has in to account TP supsamples, so even if our object/particle has a turbulent motion in less than a frame, using 4 subsamples per frame, we have nice curved motionblur.
Lets try it in
Arnold.... Nothing, we get a straight motionblur, I tryed multiple
things, nothing works. Looks like Arnold is ignoring subsamples coming
from TP or only considering a linear velocity for motionblur calculation.
The only workaround I found is in TP
output "Groups as objects" this makes any group of particles to be seen
as an object for max. We can do this only with not very heavy scenes.
Then we get curved motionblur as expected. BUT again, if we have a
change on polycount (lets say we emit particles over time, something
normal) motionblur stops working.
So... yeah, arnold is not usable for a lot lot of things right now for anyone using TP and wanting nice motionblur.
