mirror of
https://github.com/OpenSpace/OpenSpace.git
synced 2026-04-20 17:51:19 -05:00
Erik Broberg
108 lines
4.4 KiB
C++
108 lines
4.4 KiB
C++
/*****************************************************************************************
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* *
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* OpenSpace *
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* *
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* Copyright (c) 2014-2016 *
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* *
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* Permission is hereby granted, free of charge, to any person obtaining a copy of this *
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* software and associated documentation files (the "Software"), to deal in the Software *
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* without restriction, including without limitation the rights to use, copy, modify, *
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* merge, publish, distribute, sublicense, and/or sell copies of the Software, and to *
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* permit persons to whom the Software is furnished to do so, subject to the following *
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* conditions: *
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* *
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* The above copyright notice and this permission notice shall be included in all copies *
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* or substantial portions of the Software. *
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* *
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, *
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* INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A *
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* PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT *
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* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF *
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* CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE *
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* OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. *
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****************************************************************************************/
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#ifndef __ELLIPSOID_H__
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#define __ELLIPSOID_H__
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#include <modules/globebrowsing/geometry/geodetic2.h>
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namespace openspace {
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/**
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This class is based largely on the Ellipsoid class defined in the book
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"3D Engine Design for Virtual Globes". Most planets or planetary objects are better
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described using ellipsoids than spheres. All inputs and outputs to this class is
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in the WGS84 standard coordinate system where the x-axis points towards geographic
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(lat = 0, lon = 0), the y-axis points towards (lat = 0, lon = 90deg) and the
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z-axis points towards the north pole.
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*/
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class Ellipsoid {
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public:
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Ellipsoid();
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/**
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\param radii defines three radii for the Ellipsoid
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*/
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Ellipsoid(Vec3 radii);
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/**
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\param x defines the radius in x direction.
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\param y defines the radius in y direction.
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\param z defines the radius in z direction.
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*/
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Ellipsoid(Scalar x, Scalar y, Scalar z);
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~Ellipsoid();
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/**
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Scales a point along the geocentric normal and places it on the surface of the
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Ellipsoid.
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\param p is a point in the cartesian coordinate system to be placed on the surface
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of the Ellipsoid
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*/
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Vec3 geocentricSurfaceProjection(const Vec3& p) const;
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/**
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Scales a point along the geodetic normal and places it on the surface of the
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Ellipsoid.
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\param p is a point in the cartesian coordinate system to be placed on the surface
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of the Ellipsoid
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*/
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Vec3 geodeticSurfaceProjection(const Vec3& p) const;
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Vec3 geodeticSurfaceNormalForGeocentricallyProjectedPoint(const Vec3& p) const;
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Vec3 geodeticSurfaceNormal(Geodetic2 geodetic2) const;
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Vec3 radiiSquared() const;
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Vec3 oneOverRadiiSquared() const;
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Vec3 radiiToTheFourth() const;
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Scalar minimumRadius() const;
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Scalar maximumRadius() const;
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Scalar averageRadius() const;
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Geodetic2 cartesianToGeodetic2(const Vec3& p) const;
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Vec3 cartesianSurfacePosition(const Geodetic2& geodetic2) const;
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Vec3 cartesianPosition(const Geodetic3& geodetic3) const;
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private:
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struct EllipsoidCache {
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Vec3 _radiiSquared;
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Vec3 _oneOverRadiiSquared;
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Vec3 _radiiToTheFourth;
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Scalar _minimumRadius;
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Scalar _maximumRadius;
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Scalar _medianRadius;
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} _cached;
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void updateInternalCache();
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Vec3 _radii;
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};
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} // namespace openspace
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#endif // __ELLIPSOID_H__
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