Apply Velocity to RBD Pieces by Position, issue..!

[Masoud]

 

Hi everyone,

 

I have an RBD Fractured Object wired into a Rigid Body Solver (Bullet), and I’d like to apply a custom velocity to each piece whose centroid’s Y position is below 0.5.

I tried this inside a Point Wrangle within a SOP Solver, but it didn’t work:

if (@P.y < 0.5)
{
    v@vel = {0, 10, 0};
}

I also attempted the same approach inside a Geometry Wrangle in DOPs, but that didn’t work either.

Does anyone have suggestions on how to achieve this?

 

Thanks in advance!

RBD.hip

[Atom]

It is easier to control if you used packed RBDs. Then you can overwrite the v@v attribute.

Add an Assemble dop before the dopnetwork and check Create Packed Primitives.

[Masoud]

Thank you, Atom.
I actually need to apply velocity to "RBD fractured objects".

Do you have any suggestions on how to achieve this?

[Masoud]

I think I should use a (velocity vector) field, right?

 

[vicvvsh]

It's inconvenient compared to the packed primitives but if it's necessary you can try vop force dop.

 

RBD_01.hipnc

[Masoud]

Thanks, Victor. That’s really helpful.

[paranoidx]

Use the Bullet SOP Solver it’s a quicker, cleaner setup than a classic DOP workflow. Configure your pieces with RBD Configure to pack fragments and set RBD properties; even when simming in DOPs, pre-process with this node before the solver.
To inject velocity (@v) mid-sim, place a SOP Solver inside the DOP network. In the file, dive into the RBD SOP and add a SOP Solver at Post-Solve; inside it, an Update v wrangle updates per-point velocities on the RBD packed pieces.

add_v_postsolve_rbd_v1a.hiplc