Hi Masoud, If you have large amounts of floating objects, I would agree with HM_2020 and use Pop Float By Volumes DOP. I used it in this project to get the trash pieces to float and it works really well. But you don't get any interaction unfortunately.

Hi Masoud, I attached a scene file but basically I just used the RBD Object, not the Packed Object. Its the one with the rubber duck, that's the one for feedback scale to work. So if you have 5 boxes, you would need 5 objects. I also changed the FLIP source to not include a shell. It was creating some strange behavior at the start of the simulation. I also played with the Density of the RBD Object under the Physical tab. And also adjusted the feedback scale. It's a balancing act of how heavy/light the object is and the feedback scale. You may also need to use some Drag / Spin drag / Pop Look At to ensure the object behaves nicely during the simulation. lj_Floating RBD Packed object_01.hiplc

Hi Alex Attached is a modified hip. The only thing I changed was the popwrangle inside the Vellum Solver. I used an if statement to check when glue was 0, then set stopped to 0 as well as pintoanimation to 0 That did the trick lj_Vellum_Pin_To_Target.hiplc

By looking at the attached image, it does look like it follows the surface normal. I'm assuming the longer the grass gets, the more "vertical". So maybe a blend of the two for a realistic setup. Where the lower part of the grass follows the surface normal and as it gets longer, it begins to grow vertically. Just an idea, not sure if it's completely realistic.

Hi PwPwPower, See attached hip file. That's how I would approach it. lj_vellumToBody.hiplc

Can't you promote the attribute to points and then do an Attribute Blur?

Maybe try creating the curvature attribute in SOPS and then bring it into the shader with a Bind node and read in that attribute

I'd have a guess and say that the alembic geo is pretty high res and so when you attach the Configure Cloth, Houdini is having a hard time calculating all the constraints and setting all the attributes and crashes. You'd be better off using a Split SOP, splitting by the groups you created. Then remesh the cloth so that it's not too dense, then append a Configure Cloth and do your sim. Then you can point deform the original high res mesh with that sim mesh.

Grab MOPS and follow this - https://entagma.com/houdini-in-five-minutes-18-sops-redshift-mops-isocontours-setting-up-the-particles/

Hey John, Thanks for the code. I have a question, does Houdini echo your actions somewhere? I remember in Softimage, every action I did, the python would echo that action, so it was easy to create scripts as you could grab the code from there. Does Houdini have that kind of functionality?

Hi Shantanu, Drop this into the wrangle @pscale = fit01(@nage,chf("start_size"),0); Then clock the little icon under the arrow drop down on the right of code and you can set you start size and the rest will work as you expect. Particles start with the size and then they scale down to 0 at the end of their life

Can you upload the hip file?

Drop down an attribute wrangle and pipe the first cuboid into the first input and the second cuboid into the second input and type the following into the wrangle: f@dist = distance(@P, @opinput1_P); That will give you a distance attribute on each point distance_between_points.hiplc

Is it possible to send the abc of the character and the hip file to try problem solve my side?

I have found that you actually need to have the inner liquid penetrating the glass. You say the glass is double sided and the liquid inside isn't penetrating. Try use a Peak sop on the liquid and expand it a bit so that it penetrates the inside glass mesh.