MultiJoints - Plasticity

Owned by thomas (Unlicensed)
Last updated: 21 May, 2015
2 min read

Plasticity is normally a feature of soft bodies, but it is also available with joints. “Plasticity” means that deformations are irreversible and the vertices’ displacement is final. Reversible deformations can be observed with rubber balls, foamed materials or jelly-like substances, to name but a few. Irreversible transformations can be observed with metals, styrofoam or clay, for example. Here, plasticity means that the separation of points, linked by joints, becomes permanent under certain conditions. Since a certain amount of separation is essential for plasticity effects, this mode is only available if “Force max mode” is not set to “Unlimited”. The result is a very realistic behaviour in situations where you want to create cracking effects, for example a breaking dam.

It is not possible to use plasticity effects with “Limit processed joints”.

 

 

Plasticity

With “Plasticity” you can make fragments stick together as if they were connected with a kind of underlying "tissue" or "grid", while other parts can still leave the assembly.

  • This feature is only available if “Force max mode” is not set to “Unlimited”.
  • It is not possible to use plasticity effects with “Limit processed joints”.
@ Plasticity distance

When the entered distance is reached, the connection between joints becomes irreversible, behaving like an overstretched rubber band.

@ Plasticity distance random

To give your simulation a more realistic appearance, we recommend that you add a certain amount of randomness. The value that is added to “@ Plasticity distance” ranges between 0 and the number entered here.

@ Plasticity acquired

This parameter has the same meaning as "@ acquired" with soft bodies. It is the percentage of deformation kept as permanent by the joint. This means that the joint will not try to recover its initial situation any more. So, with a value of 0.2, 20% of the currently observed joint's deformation will be permanent. Thus, the value can range between 0 and 1.

In both cases (soft bodies and “MultiJoints”) "acquisition" means a percentage of the deformation suffered at each time step (changing the physical situation at each time step). This can lead to high acquisition of deformation with relatively low values. You have to play a little with the "@ threshold" (soft bodies), "@ Plasticity distance" (“MultiJoints”) and the acquired percentage to obtain the desired results.