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| |
| #ifndef QSSGPLANE_H |
| #define QSSGPLANE_H |
| |
| // |
| // W A R N I N G |
| // ------------- |
| // |
| // This file is not part of the Qt API. It exists purely as an |
| // implementation detail. This header file may change from version to |
| // version without notice, or even be removed. |
| // |
| // We mean it. |
| // |
| |
| #include <QtQuick3DUtils/private/qtquick3dutilsglobal_p.h> |
| #include <QtGui/QVector3D> |
| #include <QtCore/qmath.h> |
| |
| QT_BEGIN_NAMESPACE |
| |
| /** |
| \brief Representation of a plane. |
| |
| Plane equation used: n.dot(v) + d = 0 |
| */ |
| class Q_QUICK3DUTILS_EXPORT QSSGPlane |
| { |
| public: |
| QSSGPlane() = default; |
| |
| /** |
| \brief Constructor from a normal and a distance |
| */ |
| Q_ALWAYS_INLINE QSSGPlane(float nx, float ny, float nz, float distance) : n(nx, ny, nz), d(distance) {} |
| |
| /** |
| \brief Constructor from a normal and a distance |
| */ |
| Q_ALWAYS_INLINE QSSGPlane(const QVector3D &normal, float distance) : n(normal), d(distance) {} |
| |
| /** |
| \brief Constructor from a point on the plane and a normal |
| */ |
| Q_ALWAYS_INLINE QSSGPlane(const QVector3D &point, const QVector3D &normal) |
| : n(normal), d(-QVector3D::dotProduct(point, n)) // p satisfies normal.dot(p) + d = 0 |
| { |
| } |
| |
| /** |
| \brief Constructor from three points |
| */ |
| Q_ALWAYS_INLINE QSSGPlane(const QVector3D &p0, const QVector3D &p1, const QVector3D &p2) |
| { |
| n = QVector3D::crossProduct(p1 - p0, p2 - p0).normalized(); |
| d = QVector3D::dotProduct(-p0, n); |
| } |
| |
| Q_ALWAYS_INLINE float distance(const QVector3D &p) const { return QVector3D::dotProduct(p, n) + d; } |
| |
| Q_ALWAYS_INLINE bool contains(const QVector3D &p) const { return qAbs(distance(p)) < (1.0e-7f); } |
| |
| /** |
| \brief projects p into the plane |
| */ |
| Q_ALWAYS_INLINE QVector3D project(const QVector3D &p) const { return p - n * distance(p); } |
| |
| /** |
| \brief find an arbitrary point in the plane |
| */ |
| Q_ALWAYS_INLINE QVector3D pointInPlane() const { return -n * d; } |
| |
| /** |
| \brief equivalent plane with unit normal |
| */ |
| |
| Q_ALWAYS_INLINE void normalize(); |
| |
| QVector3D n; //!< The normal to the plane |
| float d = 0.0f; //!< The distance from the origin |
| }; |
| |
| QT_END_NAMESPACE |
| |
| #endif // QSSGPLANE_H |