These models define the volume of the object they represent.

When was the SketchUp founded?

These models represent the surface or the boundary of the object.

________ uses polygons that are planar and can only approximate curved surfaces using many polygons.

_________ uses a dense model, often generated by subdivision surfaces of a polygon control mesh."

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Shell modeling defines the volume of the object they represent.

Dynamic tessellation uses triangulation to maintain a smooth surface and allow finer details.