Help Cloth to simulate slime

[josemendez]

Thanks! I've almost achieved what I was looking for. Just one last query.

When I create a new sphere gameobject, Add a sphere collider to it, then add Obi collider component, then when I try to touch the "Slime" cloth soft body with this sphere, the body reacts to it by deforming slightly, but if I push this sphere deeper into the slime, the sphere simply goes through this body. 

This sphere is basically used to represent the user's finger pressing on the slime. 

How do I stop the sphere from passing through the slime soft body and only make the slime deform when pressed on with the sphere?

For the sphere to react to slime, you'd need to apply physics to the sphere too (add a rigidbody component, so that it can be "pushed" by the cloth), then control it using forces instead of setting its position directly. A collider alone won't do, as it doesn't give the sphere any physical properties (mass, velocity, torque, etc). Depending on how you've implemented input, controlling the sphere via forces can be a bit awkward. You could also attach the sphere to the users' "finger" using a spring or a similar physics constraint.

Now, assuming your slime is a simple rectangular plane, an alternative would be to "clamp" how deep the sphere can be in relation to the slime plane. For instance, if your slime plane is at Z = 0 and its normal points to -Z, then clamp the sphere position so that it cannot move towards positive Z (pass trough the slime). No need to add a rigidbody or use forces, so this is probably the easiest way if my assumptions about your project are correct.