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Improved Direct Voxel Grid Optimization for Radiance Fields Reconstruction
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In this technical report, we improve the DVGO framework (called DVGOv2), which is based on Pytorch and uses the simplest dense grid representation. First, we re-implement part of the Pytorch operations with cuda, achieving 2-3x speedup. The cuda extension is automatically compiled just in time. Second, we extend DVGO to support Forward-facing and Unbounded Inward-facing capturing. Third, we improve the space time complexity of the distortion loss proposed by mip-NeRF 360 from O(N^2) to O(N). The distortion loss improves our quality and training speed. Our efficient implementation could allow more future works to benefit from the loss.
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Hybrid 3D-4D Gaussian Splatting for Fast Dynamic Scene Representation
A dynamic scene rendering method that tags Gaussians as static or dynamic by their temporal scale, converting static ones to 3D to cut training time.
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