54 lines
1.1 KiB
Python
Executable File
54 lines
1.1 KiB
Python
Executable File
import igl
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V = igl.eigen.MatrixXd()
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F = igl.eigen.MatrixXi()
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# Load a mesh in OFF format
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igl.readOFF("../tutorial/shared/cheburashka.off", V, F)
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# Read scalar function values from a file, U: #V by 1
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U = igl.eigen.MatrixXd()
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igl.readDMAT("../tutorial/shared/cheburashka-scalar.dmat",U)
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U = U.col(0)
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# Compute gradient operator: #F*3 by #V
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G = igl.eigen.SparseMatrixd()
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igl.grad(V,F,G)
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# Compute gradient of U
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GU = (G*U).MapMatrix(F.rows(),3)
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# Compute gradient magnitude
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GU_mag = GU.rowwiseNorm()
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# igl::viewer::Viewer viewer;
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# viewer.data.set_mesh(V, F);
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# Compute pseudocolor for original function
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C = igl.eigen.MatrixXd()
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igl.jet(U,True,C)
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#
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# # Or for gradient magnitude
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# # igl.jet(GU_mag,True,C)
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#
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# # viewer.data.set_colors(C);
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#
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# # Average edge length divided by average gradient (for scaling)
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# max_size = igl.avg_edge_length(V,F) / GU_mag.mean()
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#
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# # Draw a black segment in direction of gradient at face barycenters
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# BC = igl.eigen.MatrixXd()
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# igl.barycenter(V,F,BC)
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# const RowVector3d black(0,0,0);
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# viewer.data.add_edges(BC,BC+max_size*GU, black);
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#
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# // Hide wireframe
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# viewer.core.show_lines = false;
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#
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# viewer.launch();
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