关于Mesh和Poly的辨析

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我们来看看3ds max Bible是怎么说的:
让我们来看看3ds Max Bible上是怎么说的:
Understanding Poly Objects
Before continuing, you need to understand exactly what a Poly object is, how it differs from a regular mesh object, and why it is the featured modeling type in Max. To understand these issues, you’ll need a quick history lesson. Initially, Max supported only mesh objects and all mesh objects had to be broken down into triangular faces. Subdividing the mesh into triangular faces ensured that all faces in the mesh object were coplanar, which prevented any hiccups with the rendering engine. Over time, the rendering engines have been modified and upgraded to handle polygons that weren’t subdivided, and doing such actually makes the model more efficient by eliminating all the extra edges required to triangulate the mesh. Also, users can work with polygon objects more easily than individual faces. To take advantage of these new features, the Editable Poly object was added to Max.
As development has continued, many new features have been added to the Editable Poly
object while the Editable Mesh remained mainly for backwards compatibility. The one advantage that the Editable Mesh object had over the Editable Poly was that the Edit Mesh modifier could be applied, but as of version 7, Max has an Edit Poly modifier, which lets you make changes to an object as a modifier that can easily be removed. Even with the addition of the Edit Poly modifier, the Editable Mesh object type still exists, and there are times when you’ll want to use each type. Editable Mesh objects split all polygons into triangular faces, but the Editable Poly object maintains four-sided polygon faces. Another key difference is found in the subobjects. Editable Meshes can work with Vertex, Edge, Face, Polygon, and Element subobjects; and Editable Poly objects can work with Vertex, Edge, Border, Polygon, and Element subobjects.

Some game engines still require that all faces be coplanar, and for such conditions, you’ll
want to continue to use the Editable Mesh object. Another case where the Editable Mesh
object is helpful is in performing certain face-oriented operations. Regardless, Max lets you
convert seamlessly between these two modeling types.
Although many of the same features are available for both object types, the advance features available for the Editable Poly object make it the preferred object type to use for mesh modeling.
This chapter focuses on working with Editable Poly objects. Although the specific features
of the Editable Mesh object aren’t covered, most of these same commands apply
equally to the Editable Mesh object.

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是三角面结构与四角面的区分？