About this document
InstaLODs Optimizer uses a parameter called the 'Mesh Deviation'. Whilst there is a setting to optimize using only this setting, the deviation is calculated nonetheless for other operations such as the target percentage.
As there are many different types of operations executed on the geometry (in different spaces) during polygon optimization, the maximum deviation should be considered as a cost value rather than a surface to surface measurement. Depending on the input geometry, the deviation value can vary heavily with the same optimization settings.
Usually, if there is no hard goal for optimizations in terms of vertex/face count, it is possible to set PercentTriangles to 0% and to set 'Maximum Deviation' to an acceptable deviation value. InstaLOD then optimizes the mesh until this criterion is met, which in many cases is lower than most people would assume, saving precious polygons while still having a good visual mesh quality.
When using the Maximum Deviation for optimization purposes, we recommend using the following settings as a reference guide:
Small deviation: 0.01 - 0.05
Medium deviation: 0.1 - 0.5
Large deviation: 1.0 - 5.0
Remember, the higher the deviation, the more change/polygon removal is deemed acceptable on the mesh.