Tessellation Settings
Use
You can use tessellation to modify the arrangement and density of model polygons. In doing so, a finer mesh is created for models as the curvature gets tighter. Note that finer meshes with more faces and detail use more resources and may take longer to render.
There are a number of tessellation parameters that define the model tessellation including tessellation level, angular tolerance, and chord height tolerance.
Tessellation Levels
The following table describes the standard settings for tessellation levels:
Standard Tessellation Level Settings
|
Tessellation Level |
Angular Tolerance |
Chord Height Tolerance |
|---|---|---|
|
Very Low |
Off |
3.1622 |
|
Low |
Off |
1.7782 |
|
Medium Low |
Off |
1.0 |
|
Medium |
45 |
0.025 |
|
Medium High |
22.50 |
0.01 |
|
High |
11.25 |
0.005 |
|
Very High |
5.63 |
0.001 |
These values are exact, but are by default scaled to the size of the objects as they are tessellated. This is described below in the description for “chord height behavior”. The chord height values work as a percentage.
User-Defined Tessellation
You can define tessellation values, including the following:
|
Setting |
Description |
|---|---|
|
Angular Tolerance |
Determines the maximum angular deviation (in degrees), allowed between a analytical surface and its triangulation Pairs of triangles do not incorporate a dihedral angle greater than this amount. This setting dictates the minimum number of facets around a smaller circle or cylinder regardless of the Chord Height Tolerance setting, and gives you added control over faces with very small radii. Lower values result in finer tessellations, while higher values give coarser tessellations. |
|
Chord Height Tolerance |
Determines the value between the analytical surface and its triangulation that defines the distance and accuracy of the tessellation The lower is the Chord Height Tolerance value, the more accurate is the result. 0.00001 is the minimum unit (High detail), and 1 000 000 is the maximum unit (Low detail). |
|
Chord Height Behavior |
Determines how accurately the chord height tolerance will be applied Absolute: Indicates that the chord height tolerance is applied exactly as is Scaled: Indicates that the values may be adjusted depending on the scale of the object being tessellated |
|
Angular Tolerance Cap |
Determines the minimum value that is applied to angular tolerance, irrespective of other settings For example, an angular tolerance cap of 45 degrees which will ensure that a circle is tessellated to have at least 8 sides. |
|
Chord Height Tolerance Cap |
Determines the minimum value that is applied to chord height tolerance, irrespective of other settings |