| Description | When a beam is created, nodes are normalized to the internal model with second node at (positive length, 0,0) and rotation, hence beam axis aligned to local x-axis and rotation stored in placement. Then subsequently, only length and rotation are used for shape generation. For example, if a beam is entered with node coordinates (0,0,0) and (-4010,0,0), they are normalized to (0,0,0) and (4010,0,0) and the structure rotation will be set to 180° around z-axis (see example file in forum discussion.
With a legacy file, where at one point apparently shapes where generated differently and node coordinates where not normalized, the once properly generated shape may have a wrong orientation after recompute. Also, when node coordinates are edited directly, they are not normalized and length and rotation are not updated, leading to the same discrepancy between node coordinates and shape.
Instead, I believe normalization should be checked and recalculated to the internal model before shape generation and on change of node coordinates, but I cannot oversee the implications on previous behaviour and potential legacy files.
|
|---|
FreeCAD