# paranoidx

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21

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• Rank
Peon

• Name
Vu Pham
• Location
Vietnam
1. ## dealing with open geometry

Just curious, can you post your issue screenshot here? I would want to see that mesh. If possible.
2. ## dealing with open geometry

Did you create vdb topology ? Its purpose to create the vdb along only on surface so technical you have an object similar image above. Is that what you want ?
3. ## dealing with open geometry

SDF for open shape in case you need https://www.tokeru.com/cgwiki/index.php?title=HoudiniVolumes#SDF_from_open_shapes
4. ## NanoVDB gpu solver + collisions ?

Here is volume source screenshot for collision (note that with Axiom Solver if you plan to use that, it gonna use collisionVel but not collisionvel, notice the "V" uppercase letter)
5. ## NanoVDB gpu solver + collisions ?

Hi Rafzdv, I just want to correct, collision fields in Pyro are (I'm using H18.5): SDF = collision Vel = collisionvel Search for collision in this document https://www.sidefx.com/docs/houdini/nodes/dop/pyrosolver_sparse.html This is video demonstration the donut is a collision, source that donut by using Collision

7. ## Vortex Cloud Simulation

Awesome internet took me here while I tried to solve my problem with pyro by using AXIOM solver. I have cross product of N to introduce swirl around a mesh, then do want to increase the speed of v but not make the smoke expand in same acceleration speed magnitude value. I did not know about centripetal force until Hristo Velev from FB Grp Hodini Artist point me to some of this knowledge. Thank you. My solve for this is create divergence field and push it inward (negative value) but solve by TIME STEP but not solve by every frame, in the same time Velocity field will add in with method PULL to act as a drag slowly accelerate to the max value but not add in right away. That was my case. Here is cross product result: And here is result from add more speed but can not reduce expand
8. ## Where Do I Place An HDA File?

I know it is an old topic. But since I am digging internet to make AWS Thinkbox Deadline work for network HDA, here is path set which good to go for current Houdini version, it good for me. HOUDINI_OTLSCAN_PATH = \$HOUDINI_PATH;@/otls; this is where I learn from: https://vfxbrain.wordpress.com/2019/11/20/hudini-env-file-on-windows/

thank you, this is so useful.
10. ## Rendering slices of pyro

or you can use a Volume VOP then sampler that volume with half of the dimension you want to slice then multiply all back to @density. You will get half or what ever slice angle.
11. ## bump map not moving with geometry

if your objects are moving, you need a @rest attribute for static frame. Rest node has 2 input. Input Right: Use a TimeShift to capture at only Frame begin where that object static Input Left is your animated object Then feed that Rest attribute into your shader texture/noise Hope it helps
12. ## Arnold Mesh Light doesn't work

Hi, it's been a long time and still I benefit from you share @Juraj Thank you, that's why forum always worth than Fb
13. ## Weird Artifacts after using RBD material fracture node? [HELP]

Is that because it is boolean so you need to add a sop Divide for a better result
14. ## How to clump vellum grains - Help!

There are: Attraction in Vellum Solver Vellum Constraint with glue or distance You can mix both to help enable the most looks for your taste.
15. ## Warcraft‘s Medivh effect?Need help

try pop attraction
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