Bitmasks for Behavior of Normals
Bitmasks used to set and access the:c:member:A3DTessFaceData::m_usUsedEntitiesFlags <A3DTessFaceData.m_usUsedEntitiesFlags>.
2.0
If this flag is set, the corresponding OneNormal entity (see:ref:Bitmasks for Specifying Tessellation Types <group__a3d__tessfacetype>) is planar and only one normal is defined for the entity. Otherwise, one normal per point is defined.