A.1 Frequency ablation study We perform an ablation study on the coarse-to-fine parameter αd and the number of frequency bands L. In Figure 1, we show the surface reconstruction results of the DTUBuddha model under different frequency parameters. Each model is trained for 300K iterations. In the first row we show the results of surface reconstruction quality under different coarse-to-fine parameters αd. It can be seen that when the parameter is too small, the surface reconstruction tends to be oversmoothed. When the parameter is too large, many artifacts will appear in the reconstruction results.

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Reconstructing 3D shapes from single-view images has been a long-standing research problem.

More specifically, one lossisLalpha = C 1 thatencourages aminimal alpha mask butmight result inagrainymask, so the other loss isLdiv = d, i.e., minimizing the divergence of the distance field to achieve more smooth/continuous alphamask.