How to inject velocity into my explosion

Forums Technical Discussion How to inject velocity into my explosion

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Value91: Member; 9 posts; Joined: Sept. 2014; Offline

Dec. 9, 2015 9:35 a.m.

Hi all!

I'm searching for the way how to make explosion like the attached file shows.
For example: i have particles and i have explosion and i need to inject velocity of my particles into this explosion(and explosion i needed is without fire)

Any ideas?
Thank you all!)

Attachments:
explosion ref.png (374.9 KB)


JordanWalsh: Member; 143 posts; Joined: Feb. 2012; Offline

Dec. 9, 2015 10:11 a.m.

Convert you particles to a velocity volume and source into the pyro sim.
Use the Velocity Volume sop to get the v attribute into the velocity field.
Just disable density/temp.etc and only source Vel in DOPs


Value91: Member; 9 posts; Joined: Sept. 2014; Offline

Dec. 9, 2015 10:51 a.m.

Thank you Jordan for your respond!

I tried to make it like you said, but i'm working with particles and pyro not a long time(
Can you show it in the project, please? I'm understand the concept how it should be, but in houdini i have some problems.
Thank you so much!

Attachments:
ext_test.hipnc (984.5 KB)


JordanWalsh: Member; 143 posts; Joined: Feb. 2012; Offline

Dec. 9, 2015 12:39 p.m.

Actually you can also do it with the fieldForce, and there is a nice example scene for you too!
http://www.sidefx.com/docs/houdini15.0/examples/nodes/dop/fieldforce/fieldforce [sidefx.com]


Value91: Member; 9 posts; Joined: Sept. 2014; Offline

Dec. 9, 2015 3:44 p.m.

JordanWalsh
Actually you can also do it with the fieldForce, and there is a nice example scene for you too!
http://www.sidefx.com/docs/houdini15.0/examples/nodes/dop/fieldforce/fieldforce [sidefx.com]

I can't download this file(some technical issues)


goldfarb: Staff; 3463 posts; Joined: July 2005; Offline

Dec. 9, 2015 4:52 p.m.

open the help in Houdini and go to
Getting Started > Examples > then look for a section called Field Force

Michael Goldfarb | www.odforce.net
Training Lead
SideFX
www.sidefx.com


Value91: Member; 9 posts; Joined: Sept. 2014; Offline

Dec. 10, 2015 4:11 a.m.

arctor
open the help in Houdini and go to
Getting Started > Examples > then look for a section called Field Force

Attachments:
error.png (48.1 KB)


JordanWalsh: Member; 143 posts; Joined: Feb. 2012; Offline

Dec. 10, 2015 6:33 a.m.

uhhh. not sure whats going on there…

Its literaly the first thing that comes up when you search help for fieldForce

Go to Help/Contents (internel browser) then put this into the address bar:
http://localhost:48628/examples/nodes/dop/fieldforce/fieldforce [localhost]
Notice how this is the same as the web link apart from the start.


Value91: Member; 9 posts; Joined: Sept. 2014; Offline

Dec. 10, 2015 7:21 a.m.

nope, still no result(
maybe if you'll have a time you can look at my project and add needed nodes? there is source for arrows and default explosion from shelf. It would be great to see this for my understanding.
thank you.


Value91: Member; 9 posts; Joined: Sept. 2014; Offline

Dec. 14, 2015 9:16 a.m.

JordanWalsh
uhhh. not sure whats going on there…

Its literaly the first thing that comes up when you search help for fieldForce

Go to Help/Contents (internel browser) then put this into the address bar:
http://localhost:48628/examples/nodes/dop/fieldforce/fieldforce [localhost]
Notice how this is the same as the web link apart from the start.

THreid to use velocity volume SOP but no result(

Attachments:
1.png (145.5 KB)
2.png (88.7 KB)
3.png (63.9 KB)


JordanWalsh: Member; 143 posts; Joined: Feb. 2012; Offline

Dec. 14, 2015 10:24 a.m.

Have a look at this file:

Attachments:
pyro_add_vel.hipnc.hip (1.0 MB)


Value91: Member; 9 posts; Joined: Sept. 2014; Offline

Dec. 14, 2015 11:21 a.m.

JordanWalsh
Have a look at this file:

Thank you a lot for your help!
I have a question:
why you're taking sopgeometry node after pyro solver? I thought that we need to get our geometry path on input 1 of pyro solver

I've tried to use perticles velocity in my sim, but i had something like that, please take a look at this file

Attachments:
ext_test_126.hipnc (777.9 KB)


Value91: Member; 9 posts; Joined: Sept. 2014; Offline

Dec. 14, 2015 11:26 a.m.

My goal is the last two explosions from this video (https://vimeo.com/126576359) [vimeo.com]


JordanWalsh: Member; 143 posts; Joined: Feb. 2012; Offline

Dec. 14, 2015 12:32 p.m.

Dops isnt the same as sops. It dosent flow from top to bottom, so can be confusing. Im just attaching data to a force that gets evaluated by the solver.
Maybe have a read of this: http://www.tokeru.com/cgwiki/index.php?title=HoudiniDops [tokeru.com]

Some helpful stuff in there


JordanWalsh: Member; 143 posts; Joined: Feb. 2012; Offline

Dec. 14, 2015 12:45 p.m.

Just had a quick look at your file.
Input 1 is for setup, honestly you dont need to touch it unless you need more fields for processing if you are doing some tricky effects.
You should be able to get everything you want from sourcing density temp and volume into the 4th input.
Use the shelf tools and see how they are setup.
Have a look at my example in the second dop network. Using this setup and probable some motion blur on the source, or custom streaking on the fast particles

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