[Sidefx-houdini-list] VOPSOP by ID
nick at nicknimble.com
Fri Nov 30 07:14:08 EST 2012
I want to retime or slow them down. I would like to beable to blend
between 2 frames. Initially I would like to not only linearly blend
between the points but also use to velocity to introduce some curvature.
This will only be visible in very extreme situations, but I want it to
visually work on a macro level.
The goal is to retime 24FPS particels to say 1000FPS, like Discoveries
Nick, be Nimble
+31 622 4243 94 | www.nicknimble.com | www.facebook.com/nicknimble
On 11/30/12 12:57 PM, Alvin Yap wrote:
> For each particle, you need to connect it to the next (future) frame?
> If you only need a linear blend, you could store the current velocity
> value and then you should know the next position in time at the
> current frame yes?
> On Fri, Nov 30, 2012 at 11:50 AM, Nick Nimble <nick at nicknimble.com
> <mailto:nick at nicknimble.com>> wrote:
> Hi Alvin,
> How would you do that? Besides I also want to be able to look
> ahead of time.
> In its simplest form I want to use a timeshift node connected to
> the second and one to the third input of a VOPSOP and import an
> attribute by $ID instead of PT.
> Nick, be Nimble
> +31 622 4243 94 <tel:%2B31%20622%204243%2094> |www.nicknimble.com <http://www.nicknimble.com> |www.facebook.com/nicknimble <http://www.facebook.com/nicknimble>
> On 11/30/12 12:44 PM, Alvin Yap wrote:
>> How about storing the previous frames' data as attributes on each
>> On Fri, Nov 30, 2012 at 11:22 AM, Nick Nimble
>> <nick at nicknimble.com <mailto:nick at nicknimble.com>> wrote:
>> I'm working on a method to re-time aka interpolate particles.
>> I would like to use a vopsop and do this as a post process.
>> The idea is to use the point position of the neighboring
>> frames and their velocities to calculate an in-between position.
>> The problem is, a vopsop works by point numbers and not
>> particles ID's and since point-numbers change when a particle
>> Any suggestions? I was thinking about the sort SOP, or
>> something like that. A method to match the point number by
>> the particle ID. Still this would result in missing
>> point-numbers and I'm not sure if Houdini would like that.
>> Nick, be Nimble
>> +31 622 4243 94 <tel:%2B31%20622%204243%2094> |
>> www.nicknimble.com <http://www.nicknimble.com> |
>> www.facebook.com/nicknimble <http://www.facebook.com/nicknimble>
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