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Skylights are associated with their parent Roof or Shell, so they adjust and reorient
themselves automatically when the geometry of that Roof or Shell changes. For example,
if we change the Slope of a Roof the Skylight will readjust itself to the new Slope. Or,
if we modify the Profile Polygon of a Shell, the Skylight again adjusts itself to the new
geometry. When a Skylight is placed into a Roof, a setting in the Skylight Settings Dialog
defines how the Skylight should adjust itself after a change in the Roof geometry. The Constraint
in Roof field has two options: Horizontal and Vertical.
Let us set this option to Horizontal for the Skylight on the left and to Vertical for the Skylight on the right,
so we can see the difference in the results. If we change the Slope of the Roof, the Skylight
on the left has been set to the Horizontal option… therefore when viewed from the top
it will remain in the same position and change its vertical position in the Roof based on
the new Roof Slope. The Skylight on the right has been set to the Vertical option which
means that its vertical position relative to the Pivot Line of the Roof will remain
the same… therefore it will adjust itself horizontally according to the new Roof Slope.
There is also a setting in the Roof Settings Dialog that affects Skylights. It is the
Fit Skylights to Curve checkbox of the Multiplane Geometry panel.
We have it checked now. The pivot line of the Roof has a curved portion and this portion
is divided into 4 segments. With our checkbox checked, Skylights will orient themselves
radially… their axis will lie on the radius of the curved pivot line.
This way they may not align with the Slope of the Roof Plane they are placed into. If
we uncheck the Fit Skylights to Curve checkbox, then Skylights will align with the Slope of
the Roof Plane they are placed into. With this setting Skylights placed into the
Roof all lie parallel to each other in the Roof plane.