I don’t quite understand here, can you explain more specifically? It is best to use more marked pictures to illustrate.
Here are some visual explanations:
In this example, the ground y position is set to 5 and the ellipsoid y is set to 1.
As explained in the documentation, the ellipsoid position is relative to the camera position and is defined by this formula:
finalPosition = position - vec3(0, ellipsoid.y, 0) + ellipsoidOffset
ellipsoidPosition = cameraPosition - vec3(0, ellipsoidDimension.y, 0) + ellipsoidOffset
So, in the default scenario:
The camera y position is set to 7, and the ellipsoid y position is
7 - 1 + 0 = 6
In the custom scenario:
The camera y position is set to 6.5, and the ellipsoid y position is
6.5 - 1 + 0.5 = 6
If you set the y position of the ground to 0, the camera will fall until the bottom of the ellipsoid touches the ground, this means that the camera stop falling at y = 2 in the default scenario and y = 1.5 in the custom one.
I had two misunderstandings before:
- I think the red ball is the camera
- I think the ellipsoidOffset.y is up along the Y axis
@LeJohn the explanation is very clearly！thanks very much！