3D movement "vibrates" since Godot 3.5.0 / 3.5.1

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3D movement "vibrates" since Godot 3.5.0 / 3.5.1

Hjolldar

Hello,

some time ago I started a little 3D project in which I use the Zylann Highmap terrain plugin for creating a landmass.

I wrote a first person controller from scratch:

Kinematic body (Collision shape: Capsule)
attached a camera to it
attached a script to it to process mouse and keyboard input to move and jump around

Most of the "magic" happens in the function "func _physics_process(delta)" where I move the FPC and apply gravity to it so that the player can run up and down ramps, can jump and can fall down from higher areas.
After calculating the next movement step, move_and_slide is called to apply the movement.

	#apply gravity
	vel.y -= gravity * delta

 	#move the player (with activated "do not slide on slope" to prevent a 
 	# slow sliding effect on slopes).
 	vel = move_and_slide(vel, Vector3.UP, true)

Everything worked fine.

But since I upgraded to Godot 3.5 the whole thing is showing a problem: When standing still on the terrain (or when
moving) the player is vibrating up and down, making the whole experience unplayable.

Did someone else experience this behaviour? Did something change between Godot 3.4.x and 3.5.x that changes the way the movement is calculated for Kinemtic bodies?

Thanks in advance.

Hjolldar.

cybereality

You can try setting vel.y to 0.0 when is_on_floor() is true.

Hjolldar

I tried to get it working to check if is_on_floor() is true. But no matter what I did, is_on_floor() always returned false.
So this did not work for me.

However, when I created the scene, the Player (FPC) was too big for the scene, so I scaled it down to 0.5 on all three axis.
The vibrating effect was gone when I scaled the FPC back to 1.0. So I had to scale up everything except the FPC to 2.0 in the scene and everything was fine.