Creates a
Primitive to visualize well-known vector vertex attributes:
normal, tangent, and bitangent. Normal
is red; tangent is green; and bitangent is blue. If an attribute is not
present, it is not drawn.Example:
scene.primitives.add(Cesium.createTangentSpaceDebugPrimitive({
geometry : instance.geometry,
length : 100000.0,
modelMatrix : instance.modelMatrix
}));