3D rendering method and apparatus

1. A three-dimensional (3D) rendering method for rendering a 3D model, the method comprising:

rendering, at a processor, the 3D model from respective viewpoints of direct light sources;

obtaining scene information on scenes rendered from the respective viewpoint of direct light sources;

selecting a direct light source from the direct light sources as a reference direct light source;

changing the scenes rendered from respective viewpoints of direct light sources that are not the reference direct light source to a viewpoint of the reference direct light source using camera parameter information;

generating a matched image by combining a direct scene rendered from the viewpoint of the direct light source and the changed scenes in which the scenes are matched by combining overlapping regions in the direct scene and the changed scenes;

sampling at least one indirect light source from the matched image; and

arranging the at least one indirect light source in a position in the 3D model corresponding to a position of the sampled indirect light source in the matched image.

2. The method of claim 1 , wherein the generating of the matched image comprises generating the matched image by combining matched regions in the scenes.

3. The method of claim 1 , wherein the generating of the matched image comprises generating the matched image based on camera parameter information associated with each viewpoint of the direct light sources.

4. The method of claim 1 , wherein the sampling of the indirect light source comprises:

dividing the matched image into regions; and

sampling the indirect light source in a region of interest in which the indirect light source is to be sampled among the regions.

5. The method of claim 1 , further comprising rendering the 3D model by applying, to the 3D model, an indirect lighting effect of the at least one sampled indirect light source.

6. The method of claim 1 , wherein the direct light sources directly radiate light to a 3D object; and

the at least one indirect light source radiates light from a region in which the light radiated from the direct light sources is reflected, refracted, or diffracted.

7. A non-transitory computer-readable storage medium storing instructions to cause computing hardware to perform the method of claim 1 .

8. A three-dimensional (3D) rendering apparatus comprising:

a processor configured to render a 3D model from respective viewpoints of direct light sources; and

a scene information storage configured to store scene information on scenes rendered from the respective viewpoint of direct light sources,

wherein the processor is further configured to

select a direct light source from the direct light sources as a reference direct light source,

change the scenes rendered from respective viewpoints of direct light sources that are not the reference direct light source to a viewpoint of the reference direct light source using camera parameter information,

generate a matched image by combining a direct scene rendered from the viewpoint of the direct light source and the changed scenes in which the scenes are matched by combining overlapping regions in the direct scene and the changed scenes,

sample at least one indirect light source from the matched image, and

arrange the at least one indirect light source in a position in the 3D model corresponding to a position of the sampled indirect light source in the matched image.

9. The apparatus of claim 8 , wherein the scene information comprises first and second attribute information comprising any one or any combination of any two or more of an intensity, a normal, a color, a reflected flux, a position, and a depth value of pixels of each scene.

10. The method of claim 9 , wherein the processor is further configured to generate the matched image in which the scenes are matched for each attribute information.

11. The apparatus of claim 8 , wherein the processor is further configured to determine whether to generate the matched image by comparing the scenes, and generate the matched image for each scene information on the scenes in response to a result of the determining being to generate the matched image.

12. The apparatus of claim 8 , wherein the processor comprises a renderer configured to generate the matched image based on camera parameter information associated with each viewpoint of the direct light sources.

13. The apparatus of claim 8 , wherein the processor comprises a renderer configured to render the 3D model by applying, to the 3D model, an indirect lighting effect of the at least one sampled indirect light source.