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While roof slabs do not dynamically interact with each other, they do allow
significant control over the roof geometry. For example, you can trim roof
slabs individually, extend them, and miter them with other roof slabs. You
can also cut holes in roof slabs, add or subtract mass elements, and apply
detailed fascia and soffit profiles to any edge at any angle and orientation.
Like slabs, roof slabs are style-based, so you can apply design changes globally.
Methods of Creating Slabs/Roof Slabs
Using slab and roof slab tools, you can create slabs and roof slabs
independently, or you can create them from existing objects, such as walls
and polylines. Slabs and roof slabs created from other objects do not maintain
a link to the original object.
Pitched roofs are usually designed by specifying a plate line and a slope angle.
Roof slabs are designed so that you can use the same approach in laying them
out. To add a roof slab, you simply specify two points and an angle.
If you have a traditionally designed roof created from a two-dimensional (2D)
plan showing ridge, hip, and valley lines, you can trace over that plan with
roof slabs, specifying the desired height and slope. From these values and the
specified points, the software creates the correct three-dimensional (3D) model.
Slab/Roof Slab Bodies
The body of a slab or roof slab is an extrusion perpendicular to the plane of
the perimeter and is defined by the following geometry:
â– The perimeter of a slab or roof slab is a planar polygon defined by the X,Y,Z
coordinates of its vertices.
â– A slab or roof slab has 3 or more vertices, with the ability to add or remove
vertices. Each pair of vertices defines an edge.
â– The thickness of a slab or roof slab extrusion is specified either in the object
style (when it has a fixed thickness) or for the individual object.
â– The position of the slab or roof slab bottom, relative to its perimeter plane,
is controlled by the thickness offset value in the style.
â– The baseline of a slab or roof slab is defined by the first two points you
select when defining the vertices.
â– The slab or roof slab insertion point, by default, is the first point on the
baseline. You can offset the baseline either horizontally or vertically from
the insertion point to allow for precise alignment with walls or structural
elements.
2380 | Chapter 30 Slabs and Roof Slabs
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