Solid modeling vs surface modeling

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					?The area of surface and solid modeling deals with shape, design and representation
of physical objects. A thorough knowledge of different aspects of modeling is
essential for anyone in the CAD field.

Since the late 1980s, software developers began applying higher levels of abstraction
to their solid modeling construction techniques. Solid modeling is a technique for
representing solid objects suitable for computer processing. It is primarily used for
CAD, engineering analysis, computer graphics and animation, rapid prototyping,
medical testing, product visualization and visualization of scientific research. Surface
modeling, on the other hand, involves describing the 3-dimensional image.

But, both have their own significance as far as CAD firms are concerned. While
surface modeling develops shapes by stretching a "surface" between 3D curves that
you individually create, solid modeling involves representing an object
unambiguously by describing its surface boundary and by topologically orienting it,
so that we can tell, at each surface point, on which side the solid interior lies.

So, you need to strike a balance between both the techniques by integrating the two.
Solid modeling has an edge over surface modeling as the former gives only a
geometrical description of the object boundary without any topological information
and is not parametric in nature. Definitely, when you see the structural form of your
design rather than a 3D representation, you can have a better picture of how your
design will take shape at the end.

With solid modeling techniques in hand, modelers are typically built with more robust
engineering tools. The real power of a solid modeling application is how it can take
the solid objects and combine them together by intersecting, joining, or subtracting
the objects from one another to create the desired resulting shapes. Because
everything in a solid model design is a 'watertight' model of the part, the solid
modeler is able to know the topology of the entire model. Surface modelers on the
other hand are built with more of an emphasis on creating aesthetic external surfaces
typically for automobiles, then trickling to mainstream products.

You need to analyze the pros and cons of both these modeling techniques, so that you
can make the best use of their benefits. First and foremost, you must understand that,
solid modeling and surface modeling are offshoots of the same ‘nurbs' technology.
Solid modeling will serve its purpose in engineering whereas surface modeling is set
to create intricate surfaces.

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