FabLab_Chemnitz/mightyscape-1.1-deprecated
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mightyscape-1.1-deprecated
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small change in paperfold

This commit is contained in:
Mario Voigt 2021-08-22 23:05:56 +02:00
parent b11ee2f93a
commit 5790a0f5ed
1 changed files with 71 additions and 64 deletions
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13
extensions/fablabchemnitz/paperfold/paperfold.py
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@ -55,7 +55,8 @@ class Paperfold(inkex.EffectExtension):
# Compute the third point of a triangle when two points and all edge lengths are given
def getThirdPoint(self, v0, v1, l01, l12, l20):
v2rotx = (l01 ** 2 + l20 ** 2 - l12 ** 2) / (2 * l01)
v2roty0 = np.sqrt((l01 + l20 + l12) * (l01 + l20 - l12) * (l01 - l20 + l12) * (-l01 + l20 + l12)) / (2 * l01)
val = (l01 + l20 + l12) * (l01 + l20 - l12) * (l01 - l20 + l12) * (-l01 + l20 + l12)
v2roty0 = np.sqrt(abs(val)) / (2 * l01)
v2roty1 = - v2roty0
@ -144,6 +145,10 @@ class Paperfold(inkex.EffectExtension):
dihedralAngles = np.empty(numUnfoldedEdges, dtype=float) # Valley folding or mountain folding
connections = np.empty(numFaces, dtype=int) # Saves which original triangle belongs to the unrolled one
numFaces = mesh.n_faces()
sizeTree = spanningTree.number_of_edges()
numUnfoldedEdges = 3 * numFaces - sizeTree
# Select the first triangle as desired
startingNode = list(spanningTree.nodes())[0]
startingTriangle = mesh.face_handle(startingNode)
@ -218,6 +223,7 @@ class Paperfold(inkex.EffectExtension):
# We walk through the tree
for dualEdge in nx.dfs_edges(spanningTree, source=startingNode):
try:
foldingEdge = mesh.edge_handle(spanningTree[dualEdge[0]][dualEdge[1]]['idx'])
# Find the corresponding half edge in the output triangle
foldingHalfEdge = mesh.halfedge_handle(foldingEdge, 0)
@ -276,7 +282,9 @@ class Paperfold(inkex.EffectExtension):
# Identify the half edges
for i in range(3):
halfEdgeConnections[originalHalfEdges[i].idx()] = unfoldedHalfEdges[i].idx()
except Exception as e:
inkex.utils.debug("Error walking the dual tree at dualEdge {}".format(e))
exit(1)
return [unfoldedMesh, isFoldingEdge, connections, glueNumber, dihedralAngles]
except Exception as e:
inkex.utils.debug("Error: model could not be unfolded. Check for:")
@ -286,7 +294,6 @@ class Paperfold(inkex.EffectExtension):
inkex.utils.debug(" - missing units")
inkex.utils.debug(" - missing coordinate system")
inkex.utils.debug(" - multiple bodies in one file")
inkex.utils.debug("error was: " + str(e))
exit(1)