Area3D Entered detections occurs where it should not

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1

Godot Version

4.2.2 Stable Mono

Question

Hello,
I’m new to Godot, but have some experience with other engines.

My game is in 3d.

I setup a “Boundary” zone, which is an Area 3D.
At first I used a World Boundary Shape and also tested with a Box shape.
I need that boundary to be a 2D plane (or, in case of the Box, a thin box).

I place the detection area in 0, 0, 20. In case of the box, the scale of the Shape (not the node), is 17, 17, 1.
The object I spawn is at 0.0.0 and is moving in Z+ direction.

My problem is that the “Area entered” signal is sent when my object is at z = 0.05
If I place the detection behind the spawner, the “Area entered” signal is not sent.
But if I place it in front, no matter where (can be in z=1000), the “Area entered” signal is sent at z=0.05

The detection zone is the selected object (to the left) and the spawner is located more or less near the light you can see to the right.

image
image1077×543 218 KB

To be noted that I have a similar setup to detect rigid bodies which works as intended.

I have seen few other topics talking about “Area entered” issues, but not really similar to mine, here.

So the question is:

  1. is there a known issue with area entered detection ?
  2. am I doing something wrong ?
2

Sounds like it might have something to do with the Shape margin of the CollisionShape3D?

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3

There should be a yellow warning box next to the Body/Shape that tells you that non-uniform (eg 1, 1, 1) Scale values will result in this type of behavior. If you want to make your Collision shape bigger/smaller/etc you have to modify its size within the shape’s Resource and not the Scale.

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