Meishu Gui, Jin Hou, Guanghong Tan, Peijun Wu. Global Illumination Algorithm Based on Voxel Cone Tracing[J]. Acta Optica Sinica, 2019, 39(6): 0620001
- Acta Optica Sinica
- Vol. 39, Issue 6, 0620001 (2019)
Fig. 1. Four phases of algorithm
Fig. 2. Voxelization. (a) Schematic; (b) before voxelization; (c) after voxelization
Fig. 3. Attribute volume of voxel structure
Fig. 4. Ambient occlusion. (a) Schematic of ambient occlusion; (b) value of ambient occlusion; (c) without ambient occlusion; (d) with ambient occlusion
Fig. 5. Anisotropic filtering and sampling
Fig. 6. Distributions of reflection and cones. (a) Diffuse reflection; (b) diffuse cones; (c) specular reflection; (d) specular cone
Fig. 7. Voxel cone tracing
Fig. 8. Test scenes. (a) Conell Box scene; (b) Sibenik Cathedral scene; (c) Crytek Sponza scene
Fig. 9. Voxel structures of S2 scene at different voxel resolutions. (a) 643 voxel; (b) 1283 voxel; (c) 2563 voxel; (d) 5123 voxel
Fig. 10. Direct illumination and global illumination. (a) Direct illumination; (b) global illumination
Fig. 11. Emissive materials. (a) Emissive plane; (b) emissive sphere
Fig. 12. Comparison of results from normal attenuation methods. (a) Original scene; (b) averaged normal attenuation; (c) normal-weighted attenuation
Fig. 13. Comparison of soft shadow effects. (a)-(c) Shadow mapping algorithm[21], with blur scales of 2, 5, 8, respectively; (d)-(f) cone tracing shadow, with cone aperture values of 5°, 10°, 15°, respectively
Fig. 14. Comparison of image quality and performance. (a)-(c) Results of light-driven voxel algorithm[20]; (d)-(f) results of proposed algorithm
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Table 1. Statistical data of test scenes
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Table 2. Memory, frame rate, and time of S2 scene at different voxel resolutions
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Table 3. Time costs in each phase
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