Polygon Mesh modeling
Polygonal modeling: Generally, a complete model is composed of many regular four-sided faces.
Its fast and editable feature is very suitable for modeling requirements that do not required high accuracy. It is mostly used for visual animation, film and television, and game modeling. Most entertainment 3D software comes with a polygon model module. Nowadays, the polygon editing system is all-around. The polygon modeling system in most of 3D software is similar.
NURBS Surface modeling
Surface modeling (NURBS Modeling) is the abbreviation of Non-Uniform Rational B-Splines, meaning “non-uniform equipartition has rational B-Splines”. Technically, The specific explanation is: Non-Uniform (non-uniform) means that the range of influence of a control vertex can be changed. Simply, NURBS is a modeling method that specializes in making curved objects. NURBS modeling is always defined by curves and surfaces, so it is very difficult to generate an angular edge on the NURBS surface. The curved surface is composed of a curved surface, and the curved surface forms a three-dimensional model. The curve has control points to control the curvature, direction, and length of the curve. In generally, the creation of a surface starts with a curve. Curves can be created by points to create surfaces, or surfaces can be created by extracting or using existing feature edge lines in the viewing area.
To use NURBS surface model, firstly create the curve. You can use the measured cloud points to create a curve, or you can outline the user’s desired curve from the raster image. According to the created curve, the main or large-area surface of the product can be created by using options such as curved, ruled, curved mesh, and sweep. Use rendering software to add materials and environmental backlighting, etc., and finally get the renderings.
Surface modeling: NURBS Modeling is very suitable for creating smooth objects, such as digital products, cars, etc. But the shortcomings of this kind of modeling are also obvious, not only difficult but also difficult to accurately parameterize. The NURBS modeling method is not eliminated, but it is inferior to Polygon Modeling in term of efficiency and Parametric Modeling (including surface modeling method) in terms of accuracy, so NURBS will be used more in visualization , which is the final mainly product renderings of video performance.