How to check if a position is covered by a collision shape?

ProbablyTooAmbitious

I have been trying to make a sort of dash/teleport, where if the player moves in a direction then presses a key, they go a bit forward in the direction they're facing. However, I have been having issues with collision. If the player goes towards a wall/object with collision, they will go into the wall for a split second before going back to their previous position. It makes it look very unpolished. What I need is a way to check if the position the player will teleport to is covered with a collision shape. I have tried using an Area2D to fix the problem but this caused various issues and didn't really fix the problem. Also, I need to make it so if the player does teleport towards a collision shape, they will just teleport next to it instead of locking them out of teleporting.

palmtreeleaf

Hi, are you using the KinematicBody's move and slide method for this? I have a similar dash except in 3d but I don't run into this problem. I use a combination of root motion and scaling with high velocity and pass this into move and slide. Otherwise maybe you could also try using a RayCast from your character to the direction they're facing, using get_collision_point, offsetting that just a little bit by the size of your character (to avoid them overlapping) and moving your character to that offsetted point.

ProbablyTooAmbitious

I tried the RayCast method, and I seem to run into a similar issue that I did when I tried to use the Area2D. The issue in question is that the RayCast2D goes through the collision shape, which is what I think causes the player to go into walls for a second. That, or I'm using get_collision_point wrong. I haven't used it before.

palmtreeleaf

Would you be able to post a snippet of your code here? I think its probably cause your player collider will overlap with the other object collider if you're just directly translating player origin to the colliding point. A small offset might avoid that but you'd have to account for the floor as well.

ProbablyTooAmbitious

Sure, here's the code: `

if Input.is_action_pressed("ui_up"):
	if Input.is_action_just_pressed(Menu.key):
		if speed_spell_amount < 3:
			if raycast.is_colliding():
				Player.position.y = raycast.get_collision_point().y
				speed_spell_amount += 1
			else:
				Player.position.y = Player.position.y - 60
				speed_spell_amount += 1
elif Input.is_action_pressed("ui_down"):
	if Input.is_action_just_pressed(Menu.key):
		if speed_spell_amount < 3:
			if raycast.is_colliding():
				Player.position.y = raycast.get_collision_point().y
				speed_spell_amount += 1
			else:
				Player.position.y = Player.position.y + 60
				speed_spell_amount += 1
elif Input.is_action_pressed("ui_left"):
	if Input.is_action_just_pressed(Menu.key):
		if speed_spell_amount < 3:
			if raycast.is_colliding():
				Player.position.x = raycast.get_collision_point().x
				speed_spell_amount += 1
			else:
				Player.position.x = Player.position.x - 60
				speed_spell_amount += 1
elif Input.is_action_pressed("ui_right"):
	if Input.is_action_just_pressed(Menu.key):
		if speed_spell_amount < 3:
			if raycast.is_colliding():
				Player.position.x = raycast.get_collision_point().x
				speed_spell_amount += 1
			else:
				Player.position.x = Player.position.x + 60
				speed_spell_amount += 1

ProbablyTooAmbitious

I forgot to say, but when teleporting upwards towards an object it works almost perfectly. The screen still shakes a little bit but it's barely noticeable. It's only an issue when moving right, left and down towards objects. It also works perfectly with tilemaps.

palmtreeleaf

If you're directly setting the position of the player you're bypassing KinematicBody's collision checking that frame, but it checks the next frame and that does the pushing apart. Since it looks like you're not handling any diagonal cases this might be a little more simple. I would try taking the width/height your player collider and divide by 2 (assuming your player origin is in the center of your character). Then for example on the ui_down function try doing Player.position.y = raycast.get_collision_point() + (heightofcollider/2). The + can be a - depending on direction. Width of collider would be used for x position.