DataCAD’s 3D polygons, slabs and blocks are closely related entities with a few important differences. A 3D polygon is a single entity with no thickness (unlike a 2D polygon, which is a group of lines drawn from Z-base to Z-height). Slabs, usually the most common entity in a model, are very similar to polygons, except that they have a thickness that you can specify. Blocks are simple solids with six rectangular or parallelogram-shaped faces. Because the top of a block doen’t have to lie directly over its bottom, blocks are particularly useful for modeling support members that lean to one side.
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