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43 lines
1.2 KiB
43 lines
1.2 KiB
#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 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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// Inputs:
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// UV 2-long uv-coordinates of screen space point
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// M 4 by 4 projection matrix
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// VP 4-long viewport: (corner_u, corner_v, width, height)
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// Outputs:
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// A 2 by 3 system matrix
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// 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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