Just starting directly from the source, direct exposure to the surface, due to object occlusion and asked range of factors such as light exposure, direct sunlight is very dramatic changes in the distribution is very uneven. Indirect illumination by direct light shines on the surface, after multiple reflections, refraction generated, so. Each direction from the environment, indirect light, but also more evenly distributed in space, there is no drastic change in the low-frequency components are light. By direct illumination and indirect illumination light generated by the surface effects can be expressed as a unified

starting directly from the source.docx

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