StaticBody3D constant_linear_velocity vertical behavior?

award

So, constant_linear_velocity is pretty simple and useful. If I add an X or Z value it makes the body a conveyor belt. If I add a Y value it makes it a trampoline.

The problem is that I want a wall acting as a vertical conveyor belt for objects touching it from the side, and this does not work as expected. I have constant_linear_velocity.y set to well above compensating for gravity, but when a CharacterBody3D contacts with it from the side, there is only a brief upward blip which quickly stops. When a RigidBody3D contacts with it from the side there is no effect at all. These same objects are conveyed just fine by constant_linear_velocity.xz, and are trampolined by constant_linear_velocity.y from the top side of the wall.

My expectation is that a physics object making constant contact with the side of the wall should be moved constantly upward, and that isn't happening. Is this a bug or am I just misunderstanding the behavior?

I'd like to avoid having to attach a script on everything that makes contact with the wall and handling this through contact reporting. Any other ideas for how to configure or work around this?

award

I have it sort of working in one scenario. It's definitely dependent on friction, and it requires the object to be moved to have a constant force orthogonal to the surface with the constant_linear_velocity value. The orthogonality of that force seems proportional to the velocity provided. If I introduce a perpendicular force, or if I rotate the angle of the surface, the effect is proportionally weakened.

Perhaps this has primarily to do with how friction is being calculated, and friction is clearly a primary contributor when using constant_linear_velocity. Unfortunately, It's a major pain in my ***. Gravity is a constant force with a vector opposite the "lift" I want from constant_linear_velocity, and gravity also reduces the orthogonality of forces on my moving object to the surface. Furthermore, if my surface is rotated around the Y axis, the the force pushing my object into the surface is even further askew, making the lift even weaker. All I want is a constant, consistent upward Y velocity applied, but unfortunately it appears this is not a way for me to achieve that.

EDIT: Actually, I just noticed that the friction coefficient can be cranked higher than 1, and this seems to help a lot. I'll toy with this...