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42 lines
1.3 KiB
42 lines
1.3 KiB
1 year ago
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#ifndef IGL_PROJECTION_CONSTRAINT_H
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#define IGL_PROJECTION_CONSTRAINT_H
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#include <Eigen/Core>
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namespace igl
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{
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/// Construct two constraint equations for projecting a point to the screen. Of the form:
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///
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/// A z = B
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///
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/// with A 2x3 and B 2x1, where z is the 3d position of point in the scene,
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/// given the current projection matrix (e.g. gl_proj * gl_modelview), viewport
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/// (corner u/v and width/height) and screen space point x,y. Satisfying this
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/// equation means that z projects to screen space point (x,y).
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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[out] A 2 by 3 system matrix
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/// @param[out] B 2 by 1 right-hand side
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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 DerivedA,
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typename DerivedB>
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void projection_constraint(
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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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Eigen::PlainObjectBase<DerivedA> & A,
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Eigen::PlainObjectBase<DerivedB> & B);
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}
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#ifndef IGL_STATIC_LIBRARY
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# include "projection_constraint.cpp"
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#endif
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#endif
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