Getting the size of a

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1

Godot Version

v4.2.2.stable.official [15073afe3]

Question

I am trying to auto generate walls around an area3d to prevent movement beyond the area3d through collision checks. The parent area3d is not of a constant size, it depends on the map. I can create a wall and size it to the width or height of the map

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image1154×684 67.7 KB

But I am running into a problem positioning the wall. If I try to use the same formula to move the wall it only moves a little bit. But if I try something like self.scale/2 it moves it way off out of view.

image

func _ready():
	if FileAccess.file_exists(map_image):
		var material = StandardMaterial3D.new()
		var texture = load(map_image)
		material.albedo_texture = texture
		mesh.material_overlay = material
		self.scale.x = texture.get_width()/modifier
		self.scale.z = texture.get_height()/modifier
		self.position.x = shift_horizontal
		self.position.z = shift_vertical
		
		north_wall.scale.z = 1/self.scale.z

If I could get the position of the corners of my map area3d I could probably extract the values I need. But I am unsure of how to do that.

Or am I going about this all wrong? Should I be preventing movement out of the play area some other way? If so, how can I autogenerate the barrier to match the size of the map?

2

If you want objects to collide you have to use StaticBody3D. Area3D can only detect physic bodies and other areas, but not collide with physic bodies.

Regarding your walls:
I believe I’ve read that changing the scale can affect correct physic calculcation. But I’m not entirely sure about this.

Maybe using a box shape for the collision shape can work? Not tested!

class_name Wall
extends StaticBody3D

var collision_shape : CollisionShape3D
var box_shape : BoxShape3D

func _ready() -> void:
        var wall_size_x = texture.get_width() * modifier

	collision_shape = CollisionShape3D.new()
	add_child(collision_shape)
        # set global_position
	
	box_shape = BoxShape3D.new()
	box_shape.size = Vector3(wall_size_x, your wall height, your wall thickness or for walls aligned the z axis the length) 
	collision_shape.shape = box_shape
1 Like
3

I am getting the size just fine. it is the position that is frustrating me. When I look at the scale of the Map.scale.z I get 45. But when I actually test the position I want the wall it is .5. I am not sure why the scale is so different from the position.

Is it possible to get the corner points of an area3d. Or a StaticBody3d, Mesh, or CollisionShape3d?

4

All right, here is the puzzler. The mesh is a rectangle. When I set the wall.position.x at .5 it lines up with the right edge.

but when I set the wall.position.z to .5 it also lines up with the bottom.

Dunno how. but it seems to work.