Understanding rigid body physics I'm following this great tutorial https://www.youtube.com/watch?v=1gM8yEMFMjg to learn how to fill a mesh with a particle system but am having trouble replicating the simulation (at 6 min 50 sec if interested). I'm using Blender 2.8

To put it very simply, in my scene I have two meshes as follows



The larger mesh has Passive rigid body, displayed as wire, and with normals set to the inside

The smaller mesh inside has Active rigid body, with sphere collision shape

When I run the simulation, instead of the smaller mesh settling on the bottom of the larger mesh, it flys out into space ignoring its container completely. How can I get them to behave?



Here is a link to the file https://drive.google.com/file/d/19teuR5pLl0xqDDRli7tOwsv7u0lYx-Ij/view?usp=sharing
I'm no expert, but I'll see if I can help quickly.  Is the outer mesh with normals pointed in the right idea?  You might need to give it some thickness somehow, perhaps by using a solidify modifier on its surfaces.  Or maybe the whole thing is trying to behave as a solid (even though you say the normals face inwards) ...if the tutorial got you here, then that sounds wrong.  But just because it is being displayed as a wireframe doesn't mean it isn't a solid.  (I don't think; I've been away from blender for a minute)