Directional lighting direction light infinite light 方向性照明平行光平均光源方向光
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3 . the uniqueness in sfs problem is argued under conditions of knowing light direction and lambertian surface assumption . 4 本文在已知光源方向、 lambertian模型假设之下讨论sfs的唯一性,证明在此假设之下算法收敛到唯一的物体形状; 4