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Simple RBD Explosion


Fakit

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Hello everyone,

A simple issue that I don't understand : RBD Explosion.
You'll see in the setup attached :
- A base geo (head)
- A quick fracture work (mask + fractures)
- RBD Configure (with active bound)
- A bullet solver

Then, I feed an AttributeAdjustVectorFloat for the Velocity (3rd input/proxy).


--> Frame 1 = Velocity Data OK
--> From Frame 2 = v@v = {0,0,0}

If I deactivate "constraint" in the RBD Material Fracture, then, I have Velocity data. 
Normal --> No constraints.

But even If i put 0.0001 for the Glue constraint : Same !
--> Frame 1 = Velocity Data OK
--> From Frame 2 = v@v = {0,0,0}

As usual, this is possibly a very simple and dumb thing.
Let me know if you can enlighten me.

Thank you !

Ps : Here's a simple tutorial about that.

Simple_RBD_Explosion.hipnc

Edited by Fakit
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Thank you for your answer @Sepu !

Yeah that's what I saw. It works If I disable the constraints. 
But let's say that I need them. I should be able to break the constraints with velocity with a very low Glue value no? 

Thanks
 

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you can not break as I said above glue constraint with just velocity.  You need to create some kind of impact like things colliding with them, events, falloffs, etc.

Have a look at this and it will give you quick overview of constraints
 

 

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Thank you for your answers!

@Sepu I'll take a look at this one for further understanding in case I missed something.

@CarlosGuzman Thank you for the explanation and the file. 
Really good method to break constraint with velocity.

So this is a clear statement, as said @Sepu : We can't break constraint with velocity only.
We need to break the constraint as you have done in your file, with the help of a threshold, but not with velocity only.
If we apply any velocity on a pre-fractured mesh, the constraint will not break by itself.

So I can also see a simple method where we can use the "Break Thresholds" in the RBD Bullet Solver, with the At Frame. (See attached file)
At the end, it's just a matter of breaking the constraints at one moment, to allow velocity to work.

Thank you for your help !
Appreciate it :)

Simple_RBD_Explosion_FKT.hipnc

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