Navigation system for a 3D virtual scene

1. A method, comprising:

designating a zoom for a view in a three-dimensional scene, said designating identifying a visible target point as indicated by a position of a pointer used by the user; and

zooming the view one of toward and away from the visible target point using a current position of the pointer as a center of the three-dimensional scene.

2. A method as recited in claim 1 , wherein the target point is an intersection point of the cursor with an object when the cursor is over an object and a distance point when the cursor in not over the object where the distance point is determined responsive to a closest point of a model in the scene.

3. A method as recited in claim 1 , wherein zoom in stops at the target point and at model boundary.

4. A method as recited in claim 1 , wherein zoom travels a predetermined distance relative to the target point.

5. A method as recited in claim 1 , wherein zoom direction is controlled by a key.

6. A method as recited in claim 1 , wherein zoom travels a distance relative to the target point responsive to cursor dragging.

7. A method as recited in claim 1 , further comprising:

allowing a user to define a zoomed view; and

zooming to the zoomed view.

8. The method as recited in claim 1 , wherein the zoom for the view and the identifying of the visible target point are implemented via a single operation.

9. A method, comprising:

designating a zoom for a view in a three-dimensional scene, said designating identifying a visible target point as indicated by a position of a pointer used by the user; and

zooming the view one of toward and away from the visible target point based on a current position of the pointer, and

wherein the target point is an intersection point of the cursor with an object when the cursor is over an object and a fixed distance point when the cursor in not over the object.

10. A method, comprising:

designating a zoom for a view in a scene and a target point, said designating identifying the target point as indicated by a position that is an intersection point of a cursor with an object when the cursor is over an object and a space point distance from the view when the cursor in not over the object; and

zooming the view one of toward and away from the target point by a predetermined distance along a vector pointing to the point, where zooming stops at the target point and a model boundary based on a current position of the cursor.

11. An apparatus, comprising:

a display; and

a computer designating a visible target point in a view of a three-dimensional scene on the display in response to a user input, the user input identifying the visible target point and a position of the pointer, and zooming toward the point, and

where said zooming is performed relative to the visible target point using a current position of the pointer as a center of the three-dimensional scene.

12. A computer configured to communicate with a storage for controlling a computer apparatus, comprising:

the computer executing an operation including:

receiving an input from a user designating a zoom for a view in a scene, said designating identifying a target point as indicated by a position of a pointer used by the user, and

zooming the view one of toward and away from the target point using a current position of the pointer as a center of the three-dimensional scene.

13. An apparatus, comprising:

a display showing a view of a three-dimensional scene zooming relative to a visible target point responsive to a user designating zoom, said designating identifying the visible target point as indicated by a position of a pointer by the user,

where a representation of the view relative to the target point is displayed using the target point as a model point on a model in the view on the display, and

where the zoom is implemented using a current position of the pointer as a center of the three-dimensional scene.