How do I add wind resistance to a simulation?

   2269   4   1
User Avatar
Member
5 posts
Joined: April 2023
Offline
Hey! I'm working on a simple simulation:



It's based on an RBD Bullet Solver. My geometry-level node tree looks like this:



I understand that everything in Houdini is essentially running in a vacuum by default. Is there any way to add wind resistance to this simulation so that it isn't falling straight down?
User Avatar
Member
2658 posts
Joined: June 2008
Offline
Double-click on the rbdbulletsolver1 node to dive inside. Drop down a popwind node and connect it to PRESOLVE. Set the x-axis value to -1. Rewind and run your simulation again to observe the effect.
Using Houdini Indie 20.5
Windows 11 64GB Ryzen 16 core.
nVidia 3060RTX 12BG RAM.
User Avatar
Member
9417 posts
Joined: July 2007
Offline
if you don't need custom wind you can also go to
RBD Solver SOP/Forces tab and turn on Drag and tweak Air Resistance as well as simple wind direction etc.
Edited by tamte - Oct. 2, 2023 13:51:56
Tomas Slancik
CG Supervisor
Framestore, NY
User Avatar
Member
5 posts
Joined: April 2023
Offline
tamte
if you don't need custom wind you can also go to
RBD Solver SOP/Forces tab and turn on Drag and tweak Air Resistance as well as simple wind direction etc.

Just as a ballpark estimate, what should my parameters be set to? I'm currently using these, but it seems that the model explodes before hitting the ground:



Also, the model still falls straight down.

Attachments:
kathal-2_EXE031_V2.hipnc (1.2 MB)

User Avatar
Member
2658 posts
Joined: June 2008
Offline
Here's an example that works. I threw away all your nodes and rebuilt it. Some parameter was messed up in your setup. Don't know which one. When in doubt, it is very common to rebuild a network.
Edited by Enivob - Oct. 5, 2023 08:57:42

Attachments:
ap_kathal-2_EXE031_V2.hipnc (1.0 MB)

Using Houdini Indie 20.5
Windows 11 64GB Ryzen 16 core.
nVidia 3060RTX 12BG RAM.
  • Quick Links