[Sidefx-houdini-list] overlapping point instance volume density pop

Olivier Jeannel facialdeluxe at gmail.com
Tue May 30 04:45:28 EDT 2017


I had some vdb problems when in vop I setted the density going to values
greater than 1.


On Tuesday, May 30, 2017, Tom Nixon <ignivomous at gmail.com> wrote:

> Hi Francois,
>
> I'm afraid I'm seeing something more than just a sum of two densities. The
> issue is that there is a visible change in the form of a "pop" between two
> density levels. This is not apparent when isolating the individual volume
> instances.
>
> This is to say a region of the render appears to drop or increase in
> density from one frame to the next. When each instance is rendered alone,
> the pop does not happen.
>
> Unfortunately, rendering each volume individually is not a viable solution
> to my problem.
>
> Thanks
>
> On Mon, May 29, 2017 at 6:58 PM, François Duchesneau <houdini at trinix.ca
> <javascript:;>>
> wrote:
>
> > Hi Tom,
> >
> > It's normal to have an increase of density when two volumes overlap. You
> > can reproduce it by rendering two volume sphere overlapping a little bit.
> > Are you referring to something else?
> >
> > Francois
> >
> >
> > On 05/29/2017 07:04 PM, Tom Nixon wrote:
> >
> >> Hey everyone,
> >>
> >> I'm getting a result in my renders that I'm don't fully understand yet.
> I
> >> hope one or some of you have come across this and can shed some light on
> >> it.
> >>
> >> I have a number of volumes that are being instanced as packed disk
> >> primitives in my renders. The density appears to pop up and down a
> couple
> >> times through the frame range.
> >>
> >> When I isolate each volume and render it, I am unable to see the same
> pop
> >> in the renders.
> >>
> >> It appears that the pop is a result of the overlapping volumes, as when
> I
> >> offset the points to reduce the overlapping and render them together,
> the
> >> pop appears to disappear.
> >>
> >> If anyone has any experience with this, I'd appreciate your input!
> >>
> >> Thanks,
> >> Tom
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