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0001273: revolve method fails

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wmayer 2013-10-17 16:53:10 +02:00
parent e90963ce11
commit 3fe1ef1677
1 changed files with 34 additions and 2 deletions
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36
src/Mod/Part/App/TopoShapePy.xml
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@ -70,8 +70,40 @@ Sub-elements such as vertices, edges or faces are accessible as:
</Methode>
<Methode Name="revolve" Const="true">
<Documentation>
<UserDocu>Revolve the shape around a Axis to a given degree.
Part.revolve(Vector(0,0,0),Vector(0,0,1),360) - revolves the shape around the Z Axis 360 degree.
<UserDocu>Revolve the shape around an Axis to a given degree.
Part.revolve(Vector(0,0,0),Vector(0,0,1),360) - revolves the shape around the Z Axis 360 degree.
Hints: Sometimes you want to create a rotation body out of a closed edge or wire.
Example:
from FreeCAD import Base
import Part
V=Base.Vector
e=Part.Ellipse()
s=e.toShape()
r=s.revolve(V(0,0,0),V(0,1,0), 360)
Part.show(r)
However, you may possibly realize some rendering artifacts or that the mesh
creation seems to hang. This is because this way the surface is created twice.
Since the curve is a full ellipse it is sufficient to do a rotation of 180 degree
only, i.e. r=s.revolve(V(0,0,0),V(0,1,0), 180)
Now when rendering this object you may still see some artifacts at the poles. Now the
problem seems to be that the meshing algorithm doesn't like to rotate around a point
where there is no vertex.
The idea to fix this issue is that you create only half of the ellipse so that its shape
representation has vertexes at its start and end point.
from FreeCAD import Base
import Part
V=Base.Vector
e=Part.Ellipse()
s=e.toShape(e.LastParameter/4,3*e.LastParameter/4)
r=s.revolve(V(0,0,0),V(0,1,0), 360)
Part.show(r)
</UserDocu>
</Documentation>
</Methode>