Fem constraint, distance of symbols

[bernd]

I'm playing with the Fem WB and run into trouble because of huge performance problems ...

Since I'm structural engin. the models I'm playing with reach from 2 meters to 50 m. The Fem constraint symbols (the red arrows and boxes) are in a raster of 10 mm. Means on a face of 1 by 1 m there are allready 10000 symbols.

Just tried to adjust this. I checked ViewProviderFemConstraint.cpp and TaskFemConstraint.cpp Found how to adjust the size and the shape of the sympols but I could just not found were to adjust the distance between the symbols. Could someone point me to the right pice of code?

[wmayer]

void ViewProviderFemConstraintForce::updateData(const App::Property* prop) and there the call of createArrow

[bernd]

void ViewProviderFemConstraintForce::updateData(const App::Property* prop) and there the call of createArrow

Thanks Werner. Found that one before but I could neiter found how to change sep nor where is defined inside sep the distance is 10 mm. sep is Type SoSeparator(). My C++ is just too smal ...

Mhh found a workaround ... Go get a cup of koffee or two ... The arrows show up even if there are thousands ... Afterwards Visibility can be turned off in view. The constraints are editable even if the symbol is not visible.

I'll come back to this for sure because this needs to be attracked at some point ...

[bernd]

Found it ... Just as a reminder the informations.

The points where the arrows are drawn are a property of the FreeCAD ForceObject

Code: Select all

>>> App.ActiveDocument.FemConstraintForce.Points
[Vector (0.0, 0.0, 80.0), Vector (100.0, 0.0, 80.0), Vector (0.0, 100.0, 80.0), Vector (100.0, 100.0, 80.0)]

but it is read only

Code: Select all

>>> App.ActiveDocument.FemConstraintForce.Points = []
Traceback (most recent call last):
  File "<input>", line 1, in <module>
AttributeError: 'DocumentObject' attribute 'Points' is read-only

src/Mod/Fem/App/FemConstraintForce.cpp
https://github.com/FreeCAD/FreeCAD_sf_m ... tForce.cpp

Code: Select all

ConstraintForce::ConstraintForce()
{
...
    ADD_PROPERTY_TYPE(Points, (Base::Vector3d()),"ConstraintForce",App::PropertyType(App::Prop_ReadOnly|App::Prop_Output),
                      "Points where arrows are drawn");
...}

the step between the points is defined in
src/Mod/Fem/App/FemConstraint.cpp
https://github.com/FreeCAD/FreeCAD_sf_m ... traint.cpp

Code: Select all

const bool Constraint::getPoints(std::vector<Base::Vector3d> &points, std::vector<Base::Vector3d> &normals) const
{
...
}

watch out for for steps, stepsv, stepsu