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whhere do stream come to play?

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A vertex is composed of n streams. A stream is composed of m elements. An element is [position, color, normal, texture coordinate]. Still confused where stream come to play. what relative does it with the mapping of the input vertex elements to the vertex input registers .

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The use of streams is not required - it just allows us to more efficiently express some algorithms (e.g. Geometry Instancing). If you're having trouble understanding them, you could ignore them for now.

The runtime/driver composites the necessary streams together such you just get a single, complete, vertex by the time it gets to your vertex shader.

hth
Jack

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