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Abstract base class for all primitive nodes. This is the abstract base class from wich all primitive node classes are derived, The primitive are: points, lines, line strips, lineloop, triangles, triangle strips, triangle fans, quads, quad strips, poligons. Note that all the primitive nodes are derived from vector: each int represents a vertex index on the current vertex set. If a primitive node is empty, all the current node vertex set are used to generate a set of primitives. On the complex sets, the value -1 are used as end-set mark, i.e. on triangle strip node, a value of -1 marks the end of a strip.