Jump to: Board index » General » Fusion

Assigning particles coordinates

Learn about 3D compositing, animation, broadcast design and VFX workflows.
  • Author
  • Message
Offline

TuskerRaiderBob

  • Posts: 33
  • Joined: Sun Oct 16, 2022 10:30 pm
  • Real Name: Jonathan Lodge

Assigning particles coordinates

PostWed Sep 27, 2023 8:25 pm

I don't think that this is possible from what I can tell, but thought that I would ask, is it possible to assign individual particles user defined coordinates in 3D space rather than being randomly distributed/equally distributed/all at the same time (not sure what the last one means)?
Intel i5-12600KF
64Gb RAM
RTX 3080Ti
Windows 11 Pro
Online

Sander de Regt

  • Posts: 3288
  • Joined: Thu Nov 13, 2014 10:09 pm

Re: Assigning particles coordinates

PostWed Sep 27, 2023 8:34 pm

I think you can do this with the pCustom node, but can you be more specific about what you want to achieve? How many particles are we dealing with here?
Sander de Regt

ShadowMaker SdR
The Netherlands
Offline

TuskerRaiderBob

  • Posts: 33
  • Joined: Sun Oct 16, 2022 10:30 pm
  • Real Name: Jonathan Lodge

Re: Assigning particles coordinates

PostWed Sep 27, 2023 8:59 pm

It's to make a star field that is based upon real star positions determined by astronomical data, it would be several thousand, different colours and sizes.
Intel i5-12600KF
64Gb RAM
RTX 3080Ti
Windows 11 Pro
Online

Sander de Regt

  • Posts: 3288
  • Joined: Thu Nov 13, 2014 10:09 pm

Re: Assigning particles coordinates

PostWed Sep 27, 2023 9:04 pm

That does sound pretty ambitious. I suggest you take this question over to the wsl-forum at steakunderwater, since this is a pretty specific request. How is the astronomical data formatted?
You have to be able to access it from Fusion in a meaningful way as well.
Sander de Regt

ShadowMaker SdR
The Netherlands
Offline
User avatar

Chad Capeland

  • Posts: 3005
  • Joined: Mon Nov 10, 2014 9:40 pm

Re: Assigning particles coordinates

PostWed Sep 27, 2023 9:04 pm

pCustom with an image that encodes the position as RGB would be the easiest, then offset the image sample based on ID or age or UV or whatever you have on the particles already. If you emit using a pImageEmitter, you'll have a that pretty much ready to go.
Chad Capeland
Indicated, LLC
www.floweffects.com
Offline

TuskerRaiderBob

  • Posts: 33
  • Joined: Sun Oct 16, 2022 10:30 pm
  • Real Name: Jonathan Lodge

Re: Assigning particles coordinates

PostThu Sep 28, 2023 12:23 pm

Sander de Regt wrote:That does sound pretty ambitious. I suggest you take this question over to the wsl-forum at steakunderwater, since this is a pretty specific request. How is the astronomical data formatted?
You have to be able to access it from Fusion in a meaningful way as well.


Thank you, I'll check that out. I don't know at the moment, that is another problem to solve which I have been given a few pointers on.
Intel i5-12600KF
64Gb RAM
RTX 3080Ti
Windows 11 Pro
Offline

TuskerRaiderBob

  • Posts: 33
  • Joined: Sun Oct 16, 2022 10:30 pm
  • Real Name: Jonathan Lodge

Re: Assigning particles coordinates

PostThu Sep 28, 2023 12:24 pm

Chad Capeland wrote:pCustom with an image that encodes the position as RGB would be the easiest, then offset the image sample based on ID or age or UV or whatever you have on the particles already. If you emit using a pImageEmitter, you'll have a that pretty much ready to go.


Thanks, I'll have a look into how to do that.
Intel i5-12600KF
64Gb RAM
RTX 3080Ti
Windows 11 Pro

Return to Fusion

Who is online

Users browsing this forum: No registered users and 22 guests