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Cleaned up python tutorials and added dependency checks to all tutorials

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Former-commit-id: 246017f041
This commit is contained in:
Sebastian Koch
2016-06-07 16:28:06 +02:00
parent c94e83cf08
commit 594aad7067
30 changed files with 621 additions and 513 deletions
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python/tutorial/204_Gradient.py
+18 -12
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@@ -1,26 +1,32 @@
# Add the igl library to the modules search path
import sys, os
sys.path.insert(0, os.getcwd() + "/../")
# Add the igl library to the modules search path
sys.path.insert(0, os.getcwd() + "/../")
import pyigl as igl
from shared import TUTORIAL_SHARED_PATH, check_dependencies
dependencies = ["viewer"]
check_dependencies(dependencies)
V = igl.eigen.MatrixXd()
F = igl.eigen.MatrixXi()
# Load a mesh in OFF format
igl.readOFF("../../tutorial/shared/cheburashka.off", V, F)
igl.readOFF(TUTORIAL_SHARED_PATH + "cheburashka.off", V, F)
# Read scalar function values from a file, U: #V by 1
U = igl.eigen.MatrixXd()
igl.readDMAT("../../tutorial/shared/cheburashka-scalar.dmat",U)
igl.readDMAT(TUTORIAL_SHARED_PATH + "cheburashka-scalar.dmat", U)
U = U.col(0)
# Compute gradient operator: #F*3 by #V
G = igl.eigen.SparseMatrixd()
igl.grad(V,F,G)
igl.grad(V, F, G)
# Compute gradient of U
GU = (G*U).MapMatrix(F.rows(),3)
GU = (G * U).MapMatrix(F.rows(), 3)
# Compute gradient magnitude
GU_mag = GU.rowwiseNorm()
@@ -31,22 +37,22 @@ viewer.data.set_mesh(V, F)
# Compute pseudocolor for original function
C = igl.eigen.MatrixXd()
igl.jet(U,True,C)
igl.jet(U, True, C)
# Or for gradient magnitude
# igl.jet(GU_mag,True,C)
viewer.data.set_colors(C);
viewer.data.set_colors(C)
# Average edge length divided by average gradient (for scaling)
max_size = igl.avg_edge_length(V,F) / GU_mag.mean()
max_size = igl.avg_edge_length(V, F) / GU_mag.mean()
# Draw a black segment in direction of gradient at face barycenters
BC = igl.eigen.MatrixXd()
igl.barycenter(V,F,BC)
igl.barycenter(V, F, BC)
black = igl.eigen.MatrixXd([[0.0,0.0,0.0]])
viewer.data.add_edges(BC,BC+max_size*GU, black)
black = igl.eigen.MatrixXd([[0.0, 0.0, 0.0]])
viewer.data.add_edges(BC, BC + max_size * GU, black)
# Hide wireframe
viewer.core.show_lines = False