I'm trying to create biological cells that divide and interact with each other in a 3D gravity-free environment. This question is about the physics implementation.
The only physical interaction they should have is a force that attracts them to each other when they touch each other. If cell A and cell B touch each other, there should be a force that acts on both such that their centers end up at a user-defined resting distance from each other.
I'm thinking I need to have CollisionShape to detect when the cells touch each other. So far I've gone with CollisionShape shaped like a sphere, and a spherical CSGMesh as visual component. I plan to use GDscript.
I'm wondering which "body" type that would be best for my implementation of the cells? I think it's a choice between "Area" and "RigidBody". Spontaneously I'm thinking that RigidBody would be better, but I need the cells to be able to overlap.
Question1: can RigidBody overlap each other? I.e. given two RigidBodies A and B shaped like spheres, can parts (or all of) A be inside the radius of B (and vice versa)? Or are RigidBody "rigid" in the sense that it doesn't allow objects to be "inside" of it.
My guess is that they don't allow objects "inside", which results in my second question.
Question2: would Area at all be useful for my implementation?
I'm thinking it can, if I can just manage to get the physics of it to work. Area clearly let's other areas be "inside" of them, so this object is probably perfect for me. This is my current approach, but the problem is that I can't find the "position" of an Area, which gets me to my third question.
Question3: how to get the position of a) a RigidBody and b) an Area (through GDscript)?
So far I've been trying to get the position of Area through get_pos(), simply calling "position", and self.position, but I get an error in either case. For details, see here the code where I've commented "THE PROBLEM", where I try to get the position of SpaceCell.