TIP Once you have found the perfect set of tessellation parameters that gives the quality you need, save them in a new preset! This demonstrates that using the 'Medium' preset is most of the time the best solution, especially if you do not need to zoom closely on the model's details. With 'Low' preset, the lack of polygons is starting to show. T he difference of quality is very hard to distinguish, especially between 'Medium' and 'High' presets. On the right side of the pictures is the same model as on the left side, but without the wireframe (edges of the mesh) displayed. Use for objects that have small details that are important, or for very small objects, like rings, microchips. Very High : delivers super-detailed meshes.Use this preset for objects that will be observed more closely (close to the virtual camera), or for objects that have small and important details It is the default preset that will give the best result in most situations, a good average between polycount and visual quality Medium (default): delivers well-balanced meshes.Use this preset for objects that will be seen from a distance, or for large objects with no details that need to be seen. The function 'Tessellate' comes with 4 default presets, that define the value for all parameters of the function: Then, adding the 'Max angle' parameter (with a 20В° value) has improved fillet precision by adding a row of polygons without increasing the polygon count for the yellow piece contour: In the example below, reducing the 'Max Sag' value from 0.2mm to 0.1mm made the mesh less rough and more realistic: But in case of very long objects (a plane body, a train cabinвЂ¦), this setting can avoid lighting artifacts caused by too long/stretched polygons. It increases the polygons count without significant improvement on the visual aspect. Max length : Used to control the maximum length of a polygon (edge).ДЇor a rendering usage, it is often recommended not to use the 'Max Length' parameter.

This provides more precision on small radius fillets.ДЄdjust the 'Max angle' parameter to keep enough polygons in high curvature areas whose radius is lower than the 'Max Sag' value, like fillets for example. Max Angle : The maximum angle allowed between normals of two adjacent polygons (on the same face).The distance values are expressed in millimeters. This parameter ensures that the mesh is similar enough to the original analytical CAD surface (exact geometry).ДЄ low value means that a very fine mesh is created. Max Sag : The maximum distance between the geometry and the tessellation (also called 'Chord error').Several parameters are used to control the tessellation (see the function dialog box), the most important ones being: TIP Want to learn more about the process of tessellating CAD models? Have a look at this keynote ! The 'Tessellate' function is available from the 'CAD' menu. Pixyz tessellation algorithm has proven to be very efficient at transforming any CAD model into meshes, ready to be displayed and exported, with a perfect balance between visual quality and polygon count. The tessellation step is very important in Data Preparation as it defines the maximum quality of the CAD model. The more triangles used to represent a surface, the more realistic the rendering, but the more computation is required. A mesh is composed of multiple connected polygons, or triangles (1 polygon generally equals 2 coplanar triangles), forming a discretized geometry that is understandable by a GPU, to be rendered in a 3D application. To be displayed in a 3D application, CAD models' faces need to be translated into tessellated surfaces, also called meshes. NOTE Have a look at About 3D Models Types to understand the difference between CAD models and Polygonal models

Triangle tessellation