Method for rendering an object

• US 8,243,072 B2
• Filed: 09/10/2008
• Issued: 08/14/2012
• Est. Priority Date: 09/11/2007
• Status: Active Grant

• Current Assignee: Philip Kramer
• Original Assignee: Philip Kramer
• Inventors: Kramer, Philip
• Primary Examiner(s): Welch, David T
• Application Number:
  US12/208,302
• Publication Number:
  US 20090066691A1
• Time in Patent Office: 1,434 Days
• Field of Search: 345/426, 345/441, 345/468, 345/581
• US Class Current: 345/426
• CPC Class Codes: G06T 17/10 Constructive solid geometry [CSG] using solid primitives, e.g. cylinders, cubes
• CPC Class Codes: G06T 19/20 Editing of 3D images, e.g. changing shapes or colours, aligning objects or positioning parts
• CPC Class Codes: G06T 2219/2021 Shape modification

Abstract

The method is for rendering an object. An object to be rendered is identified. An outline of the object is defined. A front plate of the object is identified. A back plate that is shifted relative to the front plate is created. A beveled side extending between the front plate and the back plate is identified. A beveled contour of the beveled side from a series of segments of edges is created. A boundary line between visible and non-visible segments of surfaces is identified.

Claims

1. A method for rendering an object, comprising:

identifying a two-dimensional outline by using coordinates,

a rendering application creating a front plate of a first model part by using the outline, the rendering application creating a back plate being shifted relative to the front plate,

providing a virtual tracing pen and creating a beveled side extending between the front plate and the back plate by tracing coordinates in one of three directions of a grid formed by surface units and determining whether neighboring surface units are visible or not visible by using a virtual camera,

providing a virtual pin having a first end-point and a second end-point,

associating the first end-point of the virtual pin with the first model part and the second end-point of the virtual pin with a second model part, and

identifying a first distance between the first model part and the virtual camera, defining a relationship between the first model part and the second model part in order to determine when to compare the first distance with a second distance extending between the second model part and the virtual camera,

sorting the first model part and the second model part based on the virtual pin and the first distance and the second distance, and

rendering the first model part first when the first end-point of the virtual pin associated with the first model part is farther away, and rendering the second model part first when the second end-point of the virtual pin associated with the second model part is farther away.

2. The method according to claim 1 wherein the method further comprises identifying a curved beveled side and converting the curved beveled side into a series of straight edges.

3. The method according to claim 2 wherein the method further comprises dividing the curved beveled side into curved edges having anchor points at each end and control points between the anchor points.

4. The method according to claim 3 wherein the method further comprises converting the curved edges into straight edges.

5. The method according to claim 1 wherein the method further comprises duplicating, scaling and moving the outline to create side surfaces.

6. The method according to claim 1 wherein the method further comprises calculating an angle of each. connecting point of a bevel as the object is being rendered without storing angle data.

7. The method according the claim 1 wherein the method further comprises using the virtual pin to determine when to draw a model part.

8. The method according to claim 7 wherein the method further comprises positioning the virtual pin so that the virtual pin is substantially perpendicular to the surface of the first model part and to the second model part.

9. The method according to claim 8 wherein the method further comprises using endpoints of the virtual pin to determine a distance between the first model part and a view point and a distance between the second model part and the view point.

10. The method according to claim 7 wherein the method further comprises using a surface unit grid to create an outline around visible parts of the object.

11. The method according to claim 10 wherein the method further comprises dividing the surface unit grid into four sided segments.

12. The method according to claim 11 wherein the method further comprises using one segment and one side of the segment to determine whether the segment is visible or not.

13. The method according to claim 11 wherein the method further comprises determining whether a segment is visible or not.

14. The method according to claim 13 wherein the method further comprises using flags at each side of the segment in order for the virtual tracing pen to determine which direction to continue tracing.

15. The method according to claim 1 wherein the method further comprises rendering partial curves.

16. The method according to claim 1 wherein the method further comprises identifying surfaces and/or surface units.

17. The method according to claim 16 wherein the method further comprises identifying a boundary line between visible and non-visible segments of surfaces.