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Balance Mesh Density for Smooth Geometry
When you render a model, the density of the mesh affects the smoothness of
surfaces.
Mesh components are comprised of vertices, faces, polygons, and edges.
â– A vertex is a point that forms the corner of a face or polygon.
â– A face is a triangular portion of a surface object.
â– A polygon is a quadrilateral portion of a surface object.
â– An edge is the boundary of a face or polygon.
In a drawing, all faces have three vertices, except faces in polyface meshes,
which are treated as adjoining triangles. For rendering purposes, each
quadrilateral face is a pair of triangular faces that share one edge.
Smoothing of an object is handled automatically by the renderer. Two types
of smoothing occur during the rendering process. One smoothing operation
interpolates the face normals across a surface. The other operation takes into
account the number of faces, the face count, that make up the geometry; greater
face counts result in smoother surfaces but longer processing times.
While you cannot control the interpolation of face normals, you can control
the display accuracy of curved objects by using the VIEWRES command and
the FACETRES system variable.
Control Display of Circles and Arcs
The VIEWRES command controls the display accuracy of curved 2D linework
like circles and arcs in the current viewport.
In the following example, line segments are more apparent as VIEWRES
decreases - Upper left = 1000, Middle = 100, Lower right = 10.
744 | Chapter 13 Render Drawings
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