Basic Use OF transform.Transformpoint and InversetransformPoint

Questions & Answers
1

I have searched lots of forum but failed to understand the use of these function . I only found that transform.TransformPoint converts the local to global and other function vice versa .Please tell me where to use these functions in unity
Thanx In advance

2

Please tell me where to use these
functions

That’s like asking, “where do I use Mathf.Sin().” These functions are just tools that can be used to solve problems.

A common use for Transform.InverseTransformPoint() is to find out the relationship of one object to another. Given object A facing some arbitrary direction and another object, B. If I do:

    var pos = A.InverseTransformPoint(B.position);

I now have B’s position in the local space of A. So if pos.x is negative, B will be to A’s left. If pos.y is positive, B will be above A. If pos.z is negative, B will be behind A.

As for TransformPoint(), say I had a cube with an arbitrary position, rotation, and scale and wanted to know the world position of the bottom of the cube. I could do:

 var pos = Cube.TransformPoint(Vector3.down * 0.5);

This will return the bottom of the cube at any particular rotation no matter what the local scale. That is both functions deal with position, rotation and scale.