Generating image data

• US 6,313,842 B1
• Filed: 03/03/1999
• Issued: 11/06/2001
• Est. Priority Date: 03/03/1999
• Status: Expired due to Term

• Current Assignee: Autodesk, Inc.
• Original Assignee: Discreet Logic, Inc. (Autodesk, Inc.)
• Inventors: Tampieri, Filippo
• Primary Examiner(s): Zimmerman, Mark
• Assistant Examiner(s): Santiago, Enrique L.
• Application Number:
  US09/261,121
• Time in Patent Office: 979 Days
• Field of Search: 345/426
• US Class Current: 345/426
• CPC Class Codes: G06T 15/55 Radiosity

Abstract

Image data is generated from scene data, possibly within a virtual set. The scene data defines surfaces and a plurality of lighting banks. A multi-resolution representation of a radiosity equation is constructed with respect to the scene data. The radiosity equation is solved individually for each of the light banks. A light bank for which a solution is being sought is switched on with the remaining light banks being switched off.

Claims

1. A method of generating image data from scene data, wherein said scene data includes surfaces and a plurality of light banks, comprising:

setting the light banks at a maximum intensity;

constructing a multi-resolution representation of a radiosity equation with respect to said scene data; and

solving said radiosity equation individually for each of said light banks, wherein a light bank for which a solution is being sought is switched on with the remaining light banks being switched off.

2. A method according to claim 1, wherein scene emission data is stored separately for each solution of said radiosity equation.

3. A method according to claim 1, wherein solutions of said radiosity equation are combined in response to a change in a required light bank intensity.

4. A method according to claim 1, wherein solutions of said radiosity equation are combined in response to a change in a required light bank color.

5. A method according to claim 3, wherein said light bank requests change in real time.

6. A method according to claim 5, wherein said light bank requirements are determined in response to manually operated lighting control faders.

7. A method according to claim 5, wherein said light bank requirements are determined in response to data recorded from manually operated lighting control faders.

8. A method according to claim 5, wherein said light bank requirements are determined in response to data from a virtual set.

9. A method of generating image data from scene data, wherein said scene data comprises a plurality of light sources and surfaces having emission and reflectivity characteristics represented at a spectral resolution defined by a plurality of spectral ranges, the method comprising:

setting the plurality of light sources at a maximum intensity;

constructing a multi-resolution representation of the radiosity equation for said scene;

solving said radiosity equation individually for each of said plurality of spectral ranges;

combining solutions of said radiosity equation; and

storing emission characteristics for selected surfaces at a reduced spectral resolution.

10. Apparatus for generating image data from scene data, comprising processing means, and storage means for storing said scene data and instructions for said processing means, wherein said scene data includes surfaces and a plurality of light banks;

and said instructions are configurable to control said processing means to perform a method comprising;

setting the light banks at a maximum intensity;

constructing a multi-resolution representation of a radiosity equation for said scene; and

solving said radiosity equation individually for each of said light banks, wherein a light bank for which a solution is being sought is switched on with the remaining light banks being switched off.

11. Apparatus according to claim 10, wherein said storage means stores emission data separately for each solution of said radiosity equation.

12. Apparatus according to claim 10, configurable to combine solutions of said radiosity equation in response to changes in a request for a light bank intensity.

13. Apparatus according to claim 10, configurable to combine solutions of said radiosity equation in response to a change in a request for a light bank color.

14. Apparatus according to claim 12, wherein said light bank requests changes in real time.

15. Apparatus according to claim 14, wherein said light bank changes are determined in response to lighting control faders.

16. Apparatus according to claim 14, wherein said light bank changes are determined in response to data recorded from manually operated lighting control faders.

17. Apparatus according to claim 14, wherein said light bank changes are determined in response to data from a virtual set.

18. Apparatus for generating image data from scene data, comprising processing means, and storage means for storing said scene data and instructions for said processing means, wherein said scene data comprises a plurality of light sources and surfaces having elmission and or reflectivity characteristics represented at a spectral resolution defined by a plurality of spectral ranges;

and said instructions are configurable to control said processing means to perform a method comprising;

setting the light banks at a maximum intensity;

constructing a multi-resolution representation of the radiosity equation for said scene;

solving said radiosity equation individually for each of said plurality of spectral ranges;

combining solutions of said radiosity equation; and

storing emission characteristics for selected surfaces at a reduced spectral resolution.

19. A virtual set in which real foreground images are combined with synthesised background images in real time, comprising apparatus for generating image data from scene data, processing means, and storage means for storing said scene data and instructions for said processing means, wherein said scene data comprises surfaces and a plurality of light banks;

and said instructions are configurable to control said processing means to perform a method comprising;

setting the light banks at a maximum intensity;

constructing a multi-resolution representation of a radiosity equation for said scene; and

solving said radiosity equation individually for each of said light banks, wherein a light bank for which a solution is being sought is switched on with the remaining light banks being switched off.

20. A virtual set according to claim 19, wherein said storage means stores emission data separately for each solution of said radiosity equation.

21. A virtual set according to claim 19, wherein said processing means is configurable to combine solutions of said radiosity equation in response to changes in a request for a light bank intensity.

22. A virtual set according to claim 19, wherein said processing means is configurable to combine solutions of said radiosity equation in response to a change in a request for a light bank color.

23. A virtual set according to claim 21, wherein said light bank requests changes in real time.

24. A virtual set according to claim 23, wherein said light bank changes are determined in response to lighting control faders.

25. A virtual set according to claim 23, wherein said light bank changes are determined in response to recorded data.

26. A virtual set according to claim 23, wherein said light bank changes are determined in response to operations performed upon real lighting banks.

27. A virtual set according to claim 26, wherein real lighting banks are positioned in real space at positions substantially similar to the position of synthesised lighting banks within the virtual set.

30. A computer-readable medium according to claim 27, wherein said instructions are executed by said computer, such that solutions of said radiosity equation are combined in response to a change in a required light bank intensity.

28. A computer-readable medium having computer readable instructions executable by a computer such that said computer generates image data from scene data, wherein said scene data comprises surfaces and a plurality of light banks, the computer being configured to perform a method comprising:

setting the light banks at a maximum intensity;

constructing multi-resolution representation of a radiosity equation with respect to said scene data; and

solving the radiosity equation individually for each of said light banks, wherein a light bank for which a solution is being sought is switched on with the remaining light banks being switched off.

29. A computer-readable medium having computer-readable instructions according to claim 28, wherein instructions are executable by said computer, such that scene emission data is stored separately for each solution of said radiosity equation.

31. A computer-readable medium according to claim 28, wherein said instructions are executed by said computer, such that solution of said radiosity equation are combined in response to a change in a required light bank colour.

32. A computer-readable medium according to claim 28, wherein said instructions are executed by said computer, such that said light bank requests change in real time.

33. A computer-readable medium according to claim 28, wherein said instructions are executed by said computer, such that said light bank requirements are determined in response to manually operated lighting control faders.

34. A computer-readable medium according to claim 32, wherein said instructions are executed by said computer, such that said light bank requirements are determined in response to recorded data.

35. A computer-readable medium according to claim 32, wherein said instructions are executed by said computer such that said light bank requirements are determined in response to data from a virtual set.