Hello,
I am trying to export vertex coordinates from mesh to the attribute, but I am getting this error:
TypeError: Failure to convert list values to native values.
And here is the code:
class FeatureProcessor(object):
def input(self, feature):
mesh = feature.getGeometry()
vp = mesh.getVertices()
feature.setAttribute('VertexPool', vp)
self.pyoutput(feature)
Best answer by david_r
Looking at the fmeobjects documentation, we see that FMEMesh.getVertices() returns a list of tuples of floats on the form (x, y, z). Unfortunately FMEFeature.setAttribute() doesn't know how to handle nested lists (among others), so you'll have to be a bit more specific about what you need.
Let's give some examples for the case where "vp" contains a list of the following three tuples:
[(1,2,3), (4,5,6), (7,8,9)]If you just need "VertexPool" to contain the string representation of "vp", you can do:
feature.setAttribute('VertexPool', str(vp))This will set the following string value on VertexPool:
VertexPool = '[(1, 2, 3), (4, 5, 6), (7, 8, 9)]'If you want VertexPool to be a list of all the vertices, you can do:
feature.setAttribute('VertexPool{}', [str(vertex) for vertex in vp])You will now have the following list, which you can further analyze with e.g. the ListExploder:
VertexPool{0} = '(1, 2, 3)'
VertexPool{1} = '(4, 5, 6)'
VertexPool{2} = '(7, 8, 9)'Finally, you may want to split it up further into list elements for the x,y,z components:
for n, vertex in enumerate(vp):
feature.setAttribute('VertexPool{%s}.x' % n, vertex[0])
feature.setAttribute('VertexPool{%s}.y' % n, vertex[1])
feature.setAttribute('VertexPool{%s}.z' % n, vertex[2])
Which will give you the following result:
VertexPool{0}.x = 1
VertexPool{0}.y = 2
VertexPool{0}.z = 3
VertexPool{1}.x = 4
VertexPool{1}.y = 5
VertexPool{1}.z = 6
VertexPool{2}.x = 7
VertexPool{2}.y = 8
VertexPool{2}.z = 9
Let us know if you need something specific that isn't covered above.
+37You are trying to assign a list of tuples to a single attribute.
I would suggest a structure like
VertexPool{}.x
VertexPool{}.y
VertexPool{}.z
Which could be created in a for loop
for i, v in enumerate(vp):
feature.setAttribute("VertexPool{%d}.x" %i, v[0])
feature.setAttribute("VertexPool{%d}.y" %i, v[1])
feature.setAttribute("VertexPool{%d}.z" %i, v[2]) 
Looking at the fmeobjects documentation, we see that FMEMesh.getVertices() returns a list of tuples of floats on the form (x, y, z). Unfortunately FMEFeature.setAttribute() doesn't know how to handle nested lists (among others), so you'll have to be a bit more specific about what you need.
Let's give some examples for the case where "vp" contains a list of the following three tuples:
[(1,2,3), (4,5,6), (7,8,9)]If you just need "VertexPool" to contain the string representation of "vp", you can do:
feature.setAttribute('VertexPool', str(vp))This will set the following string value on VertexPool:
VertexPool = '[(1, 2, 3), (4, 5, 6), (7, 8, 9)]'If you want VertexPool to be a list of all the vertices, you can do:
feature.setAttribute('VertexPool{}', [str(vertex) for vertex in vp])You will now have the following list, which you can further analyze with e.g. the ListExploder:
VertexPool{0} = '(1, 2, 3)'
VertexPool{1} = '(4, 5, 6)'
VertexPool{2} = '(7, 8, 9)'Finally, you may want to split it up further into list elements for the x,y,z components:
for n, vertex in enumerate(vp):
feature.setAttribute('VertexPool{%s}.x' % n, vertex[0])
feature.setAttribute('VertexPool{%s}.y' % n, vertex[1])
feature.setAttribute('VertexPool{%s}.z' % n, vertex[2])
Which will give you the following result:
VertexPool{0}.x = 1
VertexPool{0}.y = 2
VertexPool{0}.z = 3
VertexPool{1}.x = 4
VertexPool{1}.y = 5
VertexPool{1}.z = 6
VertexPool{2}.x = 7
VertexPool{2}.y = 8
VertexPool{2}.z = 9
Let us know if you need something specific that isn't covered above.
Looking at the fmeobjects documentation, we see that FMEMesh.getVertices() returns a list of tuples of floats on the form (x, y, z). Unfortunately FMEFeature.setAttribute() doesn't know how to handle nested lists (among others), so you'll have to be a bit more specific about what you need.
Let's give some examples for the case where "vp" contains a list of the following three tuples:
[(1,2,3), (4,5,6), (7,8,9)]If you just need "VertexPool" to contain the string representation of "vp", you can do:
feature.setAttribute('VertexPool', str(vp))This will set the following string value on VertexPool:
VertexPool = '[(1, 2, 3), (4, 5, 6), (7, 8, 9)]'If you want VertexPool to be a list of all the vertices, you can do:
feature.setAttribute('VertexPool{}', [str(vertex) for vertex in vp])You will now have the following list, which you can further analyze with e.g. the ListExploder:
VertexPool{0} = '(1, 2, 3)'
VertexPool{1} = '(4, 5, 6)'
VertexPool{2} = '(7, 8, 9)'Finally, you may want to split it up further into list elements for the x,y,z components:
for n, vertex in enumerate(vp):
feature.setAttribute('VertexPool{%s}.x' % n, vertex[0])
feature.setAttribute('VertexPool{%s}.y' % n, vertex[1])
feature.setAttribute('VertexPool{%s}.z' % n, vertex[2])
Which will give you the following result:
VertexPool{0}.x = 1
VertexPool{0}.y = 2
VertexPool{0}.z = 3
VertexPool{1}.x = 4
VertexPool{1}.y = 5
VertexPool{1}.z = 6
VertexPool{2}.x = 7
VertexPool{2}.y = 8
VertexPool{2}.z = 9
Let us know if you need something specific that isn't covered above.