z-buffer based interpenetrating object detection for antialiasing
View Patent ↗Graphic processor compares z-buffer values of 3D objects to detect and mark interpenetrating pixels. Tag buffer stores marked values for antialiasing effectively by over-sampling, area-based, blending, alpha edge or other pixel-processing scheme. Performance is improved by selectively antialiasing at edges and/or interpenetrations. Cost is reduced by leveraging z-buffer storage therefor. Super-sampling antialiasing reduces sampling of select interpenetration elements, thereby avoiding processing entire image.
1. A graphics signal processing method comprising:
processing a first graphics signal representing a geometry of a first three dimensional object in order to determine first z-values associated with each pixel location associated with the first three dimensional object;
processing a second graphics signal representing a geometry of a second three dimensional object in order to determine second z-values associated with each pixel location associated with the second three dimensional object;
comparing the first z-values associated with each pixel location associated with the first object with the second z-values associated with the corresponding pixel locations associated with the second three dimensional object in order to detect effectively an interpenetration of the first object and the second object at any pixel location; and
applying an antialiasing or other functionally equivalent graphics signal processing technique to the corresponding pixel locations where an interpenetration of the first object and the second object is detected.
2. The method of claim 1 wherein the second z-values are provided in a fast memory.
3. The method of claim 2 wherein the first z-values are provided in a fast memory.
4. The method of claim 1 further comprising providing in a second memory an indication and the associated corresponding pixel locations where the first z-values and the second z-values are equal or substantially equivalent.
5. The method of claim 1 wherein the antialiasing comprises an over-sampling of the pixel.
6. The method of claim 1 wherein the antialiasing is an area based antialiasing.
7. The method of claim 1 wherein the antialiasing comprises an alpha edge antialiasing.
8. The method of claim 1 wherein the antialiasing comprises a blending antialiasing.
9. The method of claim 1 wherein the interpenetration is marked in a tag buffer.
10. The method of claim 9 further comprising antialiasing a pixel corresponding with the marked interpenetration.
11. The method of claim 10 wherein the antialiasing comprises an over-sampling of the pixel.
12. The method of claim 10 wherein the antialiasing is an area based antialiasing.
13. The method of claim 10 wherein the antialiasing comprises an alpha edge antialiasing.
14. The method of claim 10 wherein the antialiasing comprises a blending antialiasing.
15. A graphical signal processing system comprising a single source, a processor, and a memory, a signal processing method comprising steps:
generating a signal representing a first three-dimensional (3D) object;
processing by the signal processor the signal in order to detect any pixel locations representing an interpenetration between the first 3D object and a second 3D object represented in a memory, the signal processor detecting the pixel locations by determining when a first z-value associated with a corresponding pixel location associated with the second 3D object are in an interpenetration range;
storing by the processor in the memory a tag representing the pixel location where the interpenetration is detected; and
antialiasing by the signal processor the pixel location where the interpenetration is detected according to an over-sampling, area-based, blending or alpha edge antialiasing.
16. A computer readable medium having embodied thereon a program, the program being executable by a machine to perform a method for processing a graphics signal, the method comprising:
processing a first graphics signal representing a geometry of a first three dimensional object in order to determine first z-values associated with each pixel location associated with the first three dimensional object;
processing a second graphics signal representing a geometry of a second three dimensional object in order to determine second z-values associated with each pixel location associated with the second three dimensional object;
comparing the first z-values associated with each pixel location associated with the first object with the second z-values associated with the corresponding pixel locations associated with the second three dimensional object in order to detect effectively an interpenetration of the first object and the second object at any pixel location; and
applying an antialiasing or other functionally equivalent graphics signal processing technique to the corresponding pixel locations where an interpenetration of the first object and the second object is detected.