Hi, You can add a new vertex to a geometry array by using by-ref geometry and the valid vertex count. As the simplest example, say you start with 4 vertices and want to add one more. If you use a by-ref aray for your coords you could make the array size 6 and initialy set the valid vetex count to 4. Using the geometry updater you could then setup your new vertex and set the valid verex count to 5. If you need more specific help or some code let me kow and I will try and dig some up for you (it has been a while since I have done any j3d).
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