SmoothedMeshGradientField Class Reference

A world-space direction field obtained by Gaussian-filtering a winding-number signed distance field and differentiating the filtered scalar field. More...

#include <lagrange/volume/SmoothedMeshGradientField.h>

Public Types
using	Grid = openvdb::Vec3SGrid
using	Accessor = Grid::ConstAccessor

Public Member Functions
template<typename Scalar, typename Index>
	SmoothedMeshGradientField (const SurfaceMesh< Scalar, Index > &mesh, double voxel_size, double epsilon, double query_reach)
	Construct a smoothed gradient field for a triangle surface mesh.
Grid::ConstPtr	grid () const
	Return a read-only shared handle to the underlying OpenVDB grid.
Accessor	accessor () const
	Return a read-only accessor to the underlying OpenVDB grid.
bool	sample_direction (const Eigen::Vector3d &position, Eigen::Vector3d &direction_out, Accessor *accessor=nullptr) const
	Sample and normalize the gradient at a world-space point.

Detailed Description

A world-space direction field obtained by Gaussian-filtering a winding-number signed distance field and differentiating the filtered scalar field.

Constructor & Destructor Documentation

SmoothedMeshGradientField()

template<typename Scalar, typename Index>

SmoothedMeshGradientField	(	const SurfaceMesh< Scalar, Index > &	mesh,
		double	voxel_size,
		double	epsilon,
		double	query_reach )

Construct a smoothed gradient field for a triangle surface mesh.

Parameters

[in]	mesh	Input mesh. Its winding-number sign defines the SDF interior.
[in]	voxel_size	Grid voxel size in world units; must be positive.
[in]	epsilon	Gaussian smoothing scale in world units; must be positive.
[in]	query_reach	Maximum expected query distance from the surface in world units.

Template Parameters

Scalar	Mesh scalar type.
Index	Mesh index type.

Member Function Documentation

sample_direction()

bool sample_direction	(	const Eigen::Vector3d &	position,
		Eigen::Vector3d &	direction_out,
		Accessor *	accessor = nullptr ) const

Sample and normalize the gradient at a world-space point.

Parameters

[in]	position	Query position.
[out]	direction_out	Outward unit direction when sampling succeeds.
[in]	accessor	Optional grid accessor to cache repeated queries (one per thread).

Returns

True for a finite, non-degenerate in-band gradient; false when the caller should use an analytic fallback.

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The documentation for this class was generated from the following files:

• lagrange/volume/SmoothedMeshGradientField.h
• SmoothedMeshGradientField.cpp