Hi Parade.
Thanks for the reply on camera map, but you didnt answer the question why checking/unchecking the motion blur box in render settings with the viewport open now takes minutes for the computer to become responsive again. Everything hangs when you unckeck it, like it's maybe reloading everything back into VRAM again?
Also here are some big problems with motion blur you might be able to help or report as an issue :
I have a base object of a head, and I've created some meshed fur as a separate object on top. The fur is linked to the object underneath so they act as 1 during animation (no deformation, just transform and rotate). I often get cases where the motion blur of the fur 'lags' behind that of the head, sometimes coming to rest several frames after the head does - it create a weird effect. Turning the motion blur steps up reduces this effect but does not eliminate it.
However, yesterday I ran into an even bigger issue. The motion blur here now seems to happen infront of the object, before it's moved into position. Instead of behind it. This is simpy a piece of fur linked to the underlying geometry.
You can see below that sometimes the fur object takes a completely different position to the base object when motion blur is activated - even though they are linked and should be in exactly the same space.
The problem is I can't always reliably reproduce this issue. It's intermittent - sometimes this renders ok, or acceptable enough you can't notice it, others exhibit these problems. Both the head and the linked fur have the same motion blur substeps so they should receive identical motion blur properties.
Would appreciate any help as this is a really big issue for me.
