CameraEditorUtils.PerspectiveClipToWorld

public static Vector3 PerspectiveClipToWorld(Matrix4x4 clipToWorld, Vector3 viewPositionWS, Vector3 positionCS);

Parameters

clipToWorld		Clip to world matrix to use.
viewPositionWS		The viewer's position in world space.
positionCS		The position in clip space.

Vector3 The corresponding world space position.

Calculate the world space position of a point in clip space.

The z component will be used to get the point at the distance z from the viewer.