Fill Letters converted to Mesh objects with top faces removed with objects I am using Blender 2.90.0 on OS X Catalina
I would like to fill up glass letters (letter object converted to mesh) with objects (actually spheres, but  used a cube to test.
I removed the top faces to allow an opening (naive of me, I know) and let the cube fall, but it bounces before it hits the opening as if there is face there.
I figure I could probably get the same affect using some sort of bounding box, but I would like to  try this using Physics.  the cube is an active object, the letter  is passive.  I have tried active for letter as  well.
I assume there has to be an &quot;official&quot; way of telling blender that the face isn't there...
This was my own error.
The Collisions shape for the letter was correct as well as the shape for the falling particle.  HOWEVER, I neglected to sett he shape for the backdrop, and the object was interacting with its &quot;convex hull&quot; shape before it got to the letter.
Now it works beautifully