ON_SignedDistanceFunction Class Reference

#include <opennurbs_plus_implicitfn.h>

Inheritance diagram for ON_SignedDistanceFunction:

Public Member Functions
	ON_SignedDistanceFunction ()
virtual double	Evaluate (const ON_3dPoint &p, ON_3dVector &normal) const =0

Public Attributes
int	nEval

Detailed Description

Copyright (c) 1993-2022 Robert McNeel & Associates. All rights reserved. OpenNURBS, Rhinoceros, and Rhino3D are registered trademarks of Robert McNeel & Associates.

THIS SOFTWARE IS PROVIDED "AS IS" WITHOUT EXPRESS OR IMPLIED WARRANTY. ALL IMPLIED WARRANTIES OF FITNESS FOR ANY PARTICULAR PURPOSE AND OF MERCHANTABILITY ARE HEREBY DISCLAIMED.

For complete openNURBS copyright information see http://www.opennurbs.org. An abstract base class for a signed distance function (SDF).

The SDF must be a non-manifold function that divides R3 into closed (possibly at infinity) regions of negative distance and positive distance, thereby defining a set of implicit boundaries where the SDF is equal to zero.

Constructor & Destructor Documentation

ON_SignedDistanceFunction()

ON_SignedDistanceFunction::ON_SignedDistanceFunction ( )

inline

Member Function Documentation

Evaluate()

virtual double ON_SignedDistanceFunction::Evaluate ( const ON_3dPoint &  p, ON_3dVector &  normal  ) const

pure virtual

Evaluate the signed distance function Parameters: p [in] - the point to evaluate the SDF at normal [out] - normal at the closest point on the SDF such that closestPt = pt - dist*normal/normal.Length() Returns: the distance between the closest point and the input point. Remarks:

1. The returned distance can be ON_UNSET_VALUE when the SDF is unable to evaluate the distance
2. The returned normal is not unitized and can have (almost) zero length.

You should account for both cases when using the SDF.

Implemented in ON_OffsetCurveSDF, ON_SphereSDF, and ON_PlaneSDF.

Member Data Documentation

nEval

int ON_SignedDistanceFunction::nEval