# Differences

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 rhino:soliddiscussion [2016/05/02]sandy rhino:soliddiscussion [2016/05/02] (current)sandy Both sides previous revision Previous revision 2016/05/02 sandy 2016/05/02 sandy 2015/10/02 sandy 2015/10/02 sandy 2015/09/14 external edit 2016/05/02 sandy 2016/05/02 sandy 2015/10/02 sandy 2015/10/02 sandy 2015/09/14 external edit Line 17: Line 17: =====Difference between Rhino and a classic Solid modeler===== =====Difference between Rhino and a classic Solid modeler===== - Unlike a solids modeler such as SolidWorks ​that works primarily with solids entities, Rhino uses a more flexible hybrid approach. But, if you export a solid from either package (say a cube) to STL, VRML etc., the result is the same. A boundary representation of the shell and no material inside the zero thickness skin. The solid, for want of a better word, is defined by the boundary and the surface direction. That is to say that everything inside must be by definition - __solid__. + Unlike a solids modeler such as SOLIDWORKS ​that works primarily with solids entities, Rhino uses a more flexible hybrid approach. But, if you export a solid from either package (say a cube) to STL, VRML etc., the result is the same. A boundary representation of the shell and no material inside the zero thickness skin. The solid, for want of a better word, is defined by the boundary and the surface direction. That is to say that everything inside must be by definition - __solid__. The way this works can be illustrated by using the Surface from Planar Curves command. The way this works can be illustrated by using the Surface from Planar Curves command. Line 25: Line 25: * Delete the surface and draw another square inside the first one. This represents a hollow cube (one with a wall section). * Delete the surface and draw another square inside the first one. This represents a hollow cube (one with a wall section). * Using the Surface from Planar Curves command, insert a surface using both squares as the boundaries. This is the slice through the cube with a wall section that is understood by the software as being a solid. * Using the Surface from Planar Curves command, insert a surface using both squares as the boundaries. This is the slice through the cube with a wall section that is understood by the software as being a solid. - * The important thing to notice is that the software understands the multiple boundaries and can resolve what is the "​meat"​ in the solid. Or in this example a slice through it. + * The important thing to notice is that the software understands the multiple boundaries and can resolve what is the "​meat"​ in the solid. Or, in this example a slice through it. =====Truth in modeling===== =====Truth in modeling=====