Primitives

Sphere {
   radius 1
}

Cylinder {
   radius .5
   height 1
}

Cone { bottomRadius 1  height 2 }

Box { }

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Example:

Shape {
   appearance Appearance { 
      material Material { diffuseColor 0 1 0 } 
   }
   geometry Cylinder { radius .5 height 1 }
}