We already have the possibility to create skewed prisms. I recently stumbled upon that I would need this feature for cylinders too.
This PR takes the existing prism extrude direction feature and use it for cylinders too
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This function takes parameters named GeoId, which evoke the Sketcher GeoId and which
indeed are used by the sketcher. However, these indices are just indices of the provided
geometry list. Therefore:
1. The are never negative (no matter if a corresponding Sketcher GeoId is external or not).
2. They do not have reserved indices for axes.
3. Most importantly, not found GeoId1 and GeoId2 are coded as -1, which for the Sketcher has
a well defined meaning (axis), whereas the Sketcher uses Constraint::GeoUndef as undefined or
not present/ not found index, which currently is -2000.
For these reasons, it was judged appropriate to rename the parameters and documentation to
emphasise that this function is unrelated and dettached from any Sketcher knowledge, and that
indices are just normal indices of a vector.
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If during assignment of weights (during the for loop iteratively setting the poles) all weights
become (temporarily) equal even though weights does not have equal values
OCCT will convert all the weights (the already assigned and those not yet assigned)
to 1.0 (nonrational b-splines have 1.0 weights). This may lead to the assignment of wrong
of weight values.
The work-around is to temporarily set the last weight to be assigned to a value different from
the current value and the to-be-assigned value for the weight at position last-to-be-assign but one.
Fixes:
https://forum.freecadweb.org/viewtopic.php?p=478701#p478702