Determines the type of 
        
        
Material that is supported by a
MaterialAppearance instance.  This is a trade-off between
flexibility (a wide array of materials) and memory/performance
(required vertex format and GLSL shader complexity.Members
static constant Cesium.MaterialAppearance.MaterialSupport.ALL : MaterialAppearance.MaterialSupportType
    All materials, including those that work in tangent space, are supported.
This requires 
position, normal, st,
tangent, and bitangent vertex attributes.
static constant Cesium.MaterialAppearance.MaterialSupport.BASIC : MaterialAppearance.MaterialSupportType
    Only basic materials, which require just 
position and
normal vertex attributes, are supported.
static constant Cesium.MaterialAppearance.MaterialSupport.TEXTURED : MaterialAppearance.MaterialSupportType
    Materials with textures, which require 
position,
normal, and st vertex attributes,
are supported.  The vast majority of materials fall into this category.
