Godot 4.0 Sphere RigidBody3D with linear_velocity on flat floor (built from many blocks) jumps

[BenjaminSchulte]

Godot version

v4.0.beta.custom_build [deb760f]

System information

Ubuntu 20.04.3 LTS, Vulkan, TU116 [GeForce GTX 1660 Ti], nvidia 470.161.03

Issue description

A sphere RigidBody3D rolling over a sequence of boxes leads the ball to jump by random.

• All boxes have a size of exact 1x1x1
• All boxes are aligned on to build a seamless, flat floor without any gap
• The ball has a bounce of 0.5
• The ball is a simple RigidBody with an increasing linear_velocity
• The ball starts to jump at some edges by random

RigidBodyBug.mp4

The green in the video line visualizes the Y coordinate.

The expected result would be a ball just rolling over the floor without jumping.

Steps to reproduce

• Create CSGBoxes with collision and place them without a gap (Round positions to full numbers)
• Add a RigidBody3D with a sphere collisionshape
• Set the bounce value to 0.5
• Add a script which increments the linear velocity over time
• Place the RigidBody3D on the boxes to let it roll across the boxes

Example script:

extends RigidBody3D
func _physics_process(delta: float) -> void:
    linear_velocity.x -= 10 * delta

Minimal reproduction project

RigidBodyBug.zip

[Calinou]

Duplicate of #50463.