Janky slope sliding with y acceleration

prowlingDemon

When I accelerate my kinematicBody2D down a slope the movement becomes a bit jittery, as can be seen here (I disabled camera smoothing to make it more apparent) This problem only happens when the velocity.y changes over time.

I am increasing the player's y velocity like this: player.velocity.y += (player.GRAVITY player.get_floor_angle() / 2)delta

I move the character in the sliding state with this:
velocity = move_and_slide_with_snap(velocity, snap_vector, Vector2.UP, false, 4, SLIDE_END)

Anyone have a clue as to what the problem could be/how it could be fixed?

Nerdzmasterz

First thing that comes to the top of my mind is to use an area2D under the player and have it detect if it is colliding with a surface. Connect the area2D signal to the player, and then set it up like this:

if body.name != player:
	#play walk animation

Nerdzmasterz

Another method is to use a raycast that aims down from the player to detect the ground.

Nerdzmasterz

If you want something more advanced than that, and align the character to the surface, this site will help.

https://kidscancode.org/godot_recipes/2d/2d_align_surface/

Megalomaniak

I'm not sure that !== is a thing. Maybe try != instead.

Nerdzmasterz

Sorry. Fixed it.

Megalomaniak

I mean strict inequality check is a thing for an example in javascript. I'm just not sure if it's a thing in say GDScript 2.0 - haven't tried.

Nerdzmasterz

It isn't a thing in GDScript, it was a typo. I'll try to watch what I type better.

prowlingDemon

My issue wasn't animation or floor detection, it's that my collision shape was buggy when sliding on a slope. What was causing my problem was the safe_margin, which I had increased to solve another collision problem. To solve both problems I i reset the safe_margin to its originally lower value and rotated the gravity vector to correspond to the slope (inspired by https://kidscancode.org/godot_recipes/2d/2d_align_surface/, thanks @Nerdzmasterz ).