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74 lines
2.4 KiB
74 lines
2.4 KiB
1 year ago
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// This file is part of libigl, a simple c++ geometry processing library.
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//
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// Copyright (C) 2016 Alec Jacobson <alecjacobson@gmail.com>
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//
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// This Source Code Form is subject to the terms of the Mozilla Public License
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// v. 2.0. If a copy of the MPL was not distributed with this file, You can
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// obtain one at http://mozilla.org/MPL/2.0/.
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#ifndef IGL_UNPROJECT_ONTO_MESH
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#define IGL_UNPROJECT_ONTO_MESH
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#include "igl_inline.h"
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#include "Hit.h"
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#include <Eigen/Core>
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#include <functional>
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namespace igl
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{
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/// Unproject a screen location (using current opengl viewport, projection, and
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/// model view) to a 3D position _onto_ a given mesh, if the ray through the
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/// given screen location (x,y) _hits_ the mesh.
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///
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/// @param[in] pos screen space coordinates
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/// @param[in] model model matrix
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/// @param[in] proj projection matrix
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/// @param[in] viewport vieweport vector
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/// @param[in] V #V by 3 list of mesh vertex positions
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/// @param[in] F #F by 3 list of mesh triangle indices into V
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/// @param[out] fid id of the first face hit
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/// @param[out] bc barycentric coordinates of hit
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/// @return true if there's a hit
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///
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/// #### Example:
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///
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/// \code{cpp}
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/// igl::opengl::glfw::Viewer vr;
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/// ...
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/// igl::unproject_onto_mesh(
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/// pos,vr.core().view,vr.core().proj,vr.core().viewport,V,F,fid,bc);
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/// \endcode
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///
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template < typename DerivedV, typename DerivedF, typename Derivedbc>
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IGL_INLINE bool unproject_onto_mesh(
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const Eigen::Vector2f& pos,
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const Eigen::Matrix4f& model,
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const Eigen::Matrix4f& proj,
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const Eigen::Vector4f& viewport,
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const Eigen::MatrixBase<DerivedV> & V,
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const Eigen::MatrixBase<DerivedF> & F,
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int & fid,
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Eigen::PlainObjectBase<Derivedbc> & bc);
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/// \overload
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/// @param[in] shoot_ray function handle that outputs hits of a given ray against a
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/// mesh (embedded in function handles as captured variable/data)
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template <typename Derivedbc>
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IGL_INLINE bool unproject_onto_mesh(
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const Eigen::Vector2f& pos,
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const Eigen::Matrix4f& model,
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const Eigen::Matrix4f& proj,
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const Eigen::Vector4f& viewport,
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const std::function<
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bool(
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const Eigen::Vector3f&,
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const Eigen::Vector3f&,
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igl::Hit &)
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> & shoot_ray,
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int & fid,
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Eigen::PlainObjectBase<Derivedbc> & bc);
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}
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#ifndef IGL_STATIC_LIBRARY
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# include "unproject_onto_mesh.cpp"
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#endif
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#endif
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