Vector3.Project

`Vector3.Project` is a method in Unity's `Vector3` class that projects a vector onto another vector.

The method takes two `Vector3` parameters: `vector` and `onNormal`. `vector` is the vector you want to project, and `onNormal` is the vector you want to project onto.

The method returns a `Vector3` that represents the projection of `vector` onto `onNormal`. The projection is calculated by taking the dot product of `vector` and `onNormal`, and dividing the result by the square magnitude of `onNormal`. The resulting vector is then multiplied by `onNormal`.

Here's an example of how to use `Vector3.Project`:

Vector3 vector = new Vector3(1, 2, 3);
Vector3 onNormal = new Vector3(0, 1, 0);
Vector3 projection = Vector3.Project(vector, onNormal);

In this example, `vector` is projected onto the `y` axis by passing in `(0, 1, 0)` as the `onNormal` parameter. The resulting `projection` vector would be `(0, 2, 0)`, since the projection of `vector` onto the `y` axis would have no `x` or `z` component.