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OpenVDB is an open source C++ library comprising a novel hierarchical data structure and a suite of tools for the efficient storage and manipulation of the sparse volumetric, point, and level set data discretized on three-dimensional grids.

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Auto step size, when turned on, will ignore the step size that is manually set.  InsteadInstead, you can modify the step size from its natural value with step scale instead.  When turned off, you can manually set the step size.

Step Size

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Step size governs the minimum distance the solver will advance when trying to find the surface. If it is too low, the true surface may not be found; if it is too large, the surface may not be found accurately.  It is usually recommended to turn on auto step size rather than manually set this.

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