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56 lines
1.8 KiB
56 lines
1.8 KiB
1 year ago
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#ifndef IGL_UNPROJECT_ON_LINE_H
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#define IGL_UNPROJECT_ON_LINE_H
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#include <Eigen/Dense>
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namespace igl
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{
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/// Given a screen space point (u,v) and the current projection matrix (e.g.
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/// gl_proj * gl_modelview) and viewport, _unproject_ the point into the scene
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/// so that it lies on given line (origin and dir) and projects as closely as
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/// possible to the given screen space point.
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///
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/// @param[in] UV 2-long uv-coordinates of screen space point
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/// @param[in] M 4 by 4 projection matrix
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/// @param[in] VP 4-long viewport: (corner_u, corner_v, width, height)
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/// @param[in] origin point on line
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/// @param[in] dir vector parallel to line
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/// @param[out] t line parameter so that closest poin on line to viewer ray through UV
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/// lies at origin+t*dir
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template <
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typename DerivedUV,
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typename DerivedM,
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typename DerivedVP,
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typename Derivedorigin,
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typename Deriveddir>
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void unproject_on_line(
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const Eigen::MatrixBase<DerivedUV> & UV,
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const Eigen::MatrixBase<DerivedM> & M,
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const Eigen::MatrixBase<DerivedVP> & VP,
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const Eigen::MatrixBase<Derivedorigin> & origin,
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const Eigen::MatrixBase<Deriveddir> & dir,
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typename DerivedUV::Scalar & t);
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/// \overload
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/// @param[out] Z 3d position of closest point on line to viewing ray through UV
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template <
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typename DerivedUV,
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typename DerivedM,
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typename DerivedVP,
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typename Derivedorigin,
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typename Deriveddir,
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typename DerivedZ>
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void unproject_on_line(
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const Eigen::MatrixBase<DerivedUV> & UV,
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const Eigen::MatrixBase<DerivedM> & M,
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const Eigen::MatrixBase<DerivedVP> & VP,
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const Eigen::MatrixBase<Derivedorigin> & origin,
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const Eigen::MatrixBase<Deriveddir> & dir,
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Eigen::PlainObjectBase<DerivedZ> & Z);
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}
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#ifndef IGL_STATIC_LIBRARY
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# include "unproject_on_line.cpp"
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#endif
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#endif
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