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52 lines
1.5 KiB
52 lines
1.5 KiB
1 year ago
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#include "update.h"
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#include <igl/heat_geodesics.h>
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#include <igl/unproject_onto_mesh.h>
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bool update(
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const Eigen::MatrixXd & V,
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const Eigen::MatrixXi & F,
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const double t,
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const double x,
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const double y,
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const Eigen::Matrix4f& view,
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const Eigen::Matrix4f& proj,
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const Eigen::Vector4f& viewport,
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const igl::HeatGeodesicsData<double>& data,
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Eigen::VectorXd& D)
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{
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int fid;
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Eigen::Vector3f bc;
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// Cast a ray in the view direction starting from the mouse position
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if(igl::unproject_onto_mesh(Eigen::Vector2f(x,y), view,
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proj, viewport, V, F, fid, bc))
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{
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// if big mesh, just use closest vertex. Otherwise, blend distances to
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// vertices of face using barycentric coordinates.
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if(F.rows()>100000)
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{
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// 3d position of hit
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const Eigen::RowVector3d m3 =
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V.row(F(fid,0))*bc(0) + V.row(F(fid,1))*bc(1) + V.row(F(fid,2))*bc(2);
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int cid = 0;
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Eigen::Vector3d(
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(V.row(F(fid,0))-m3).squaredNorm(),
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(V.row(F(fid,1))-m3).squaredNorm(),
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(V.row(F(fid,2))-m3).squaredNorm()).minCoeff(&cid);
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const int vid = F(fid,cid);
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igl::heat_geodesics_solve(data,(Eigen::VectorXi(1,1)<<vid).finished(),D);
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}else
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{
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D = Eigen::VectorXd::Zero(V.rows());
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for(int cid = 0;cid<3;cid++)
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{
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const int vid = F(fid,cid);
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Eigen::VectorXd Dc;
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igl::heat_geodesics_solve(data,(Eigen::VectorXi(1,1)<<vid).finished(),Dc);
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D += Dc*bc(cid);
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}
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}
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return true;
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}
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return false;
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}
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