Character launches when hitting platform

RHK

I've got a Kinematic character with a Capsule CollisionShape2d. When the lower curve of the capsule hits a platform, it launches the character in the air like they'd jumped. How do I prevent this?

Character Node structure: KinematicBody2D --CollisionsShape2D --AnimatedSprite

Code:

            func get_input():
            	velocity.x = 0
            	if Input.is_action_pressed("ui_right"):
            		TurnRight(true)
            		velocity.x += speed
            	if Input.is_action_pressed("ui_left"):
            		TurnRight(false)
            		velocity.x -= speed
            
            
            
            func _physics_process(delta):
            	get_input()
            	
            	var collision = move_and_collide((velocity +fanVelocity)* delta)
            	if (collision)&&(collision.collider.name.substr(0,10)=="CloudSmall"):
            		collision.collider.FadeOut()
            	
            	if velocity.y < maxYvel:		
            		velocity.y += gravity * delta
            	else: velocity.y = maxYvel
            	
            	velocity = move_and_slide(velocity, Vector2.UP)
            
            
            	fanVelocity=Vector2(0,0)

Any ideas? I can't add physics materials to the KinematicBody2d, or a weight to affect gravity. I modified the code from a tutorial; it uses move_and_collide and later move_and_slide - is that a problem? When I remove move and collide, it still occurs. Removing move and slide, and the character gets stuck as it moves along the platform.

Thanks for any suggestions!

fire7side

Move and slide has some options you might want to try out, for instance stop on slopes is set to false on default, and other ones. It sounds like some kind of physics problem because you don't have a jump set up in your code and your gravity only gives it downward force.

cybereality

So it's tough to say the exact problem with the jumping, but I see a few things that look strange. The gravity should only apply when in the air. In your case you are applying it all the time (as now as it is below the max) which won't work. There are many ways to fix this, but the easiest thing to do would be to check if is_on_floor() is true and then set velocity.y equal to zero.

if velocity.y < maxYvel:        
    velocity.y += gravity * delta
elif is_on_floor():
    velocity.y = 0.0
else: 
    velocity.y = maxYvel

The second problem is that you are calling move_and_collide() and move_and_slide() on the same frame. Though this can work in some cases, in your case I believe you want to choose one of the other. I find move_and_collide() to be more reliable, and also provide better handling when touching the wall or sloped floors. So I would recommend doing that.

If you need collisions (like for item pickups) then there are other methods. One is using Area2D and checking the overlap, for example by using body_entered. Or you can use ray casts (but this is more advanced). I think the body_entered signal would be the easiest thing for your code. https://docs.godotengine.org/en/stable/classes/class_area2d.html