Gets and sets a boolean to enable hue variation effect on the imported SpeedTree model.
Hue variation varies the color of the model based on its world position, resulting in a more natural forest look. Use this variable to toggle this effect and see SpeedTreeImporter.hueVariation to set a variation color.
To change this setting for a specific LOD, see SpeedTreeImporter.enableHue and SpeedTreeImporter.enableSettingOverride.