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