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SecondLife/Opensim uses Primitives to construct models. How it works in details is explained here.

Now I have many triangles which link together. Is there any way to make them into one prim, thus reducing the number of prims?

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No. A "prim" is a primative object, and is the base building blocks for building 3d content.

You cannot combine shapes into a single prim.

However you can use prims efficiently by using clever textures instead of details, or by using fewer larger prims to create your objects.

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The point of a prim, in SecondLife, is that it requires a very small amount of data to fully define a (potentially) very complicated model. The purpose of modelling with prims is specifically to discourage people from modelling things using triangle soups, which require a lot more data to store and to transfer to each viewer. – Trevor Powell Oct 4 '11 at 5:30
@AttackingHobo: Then how should I use fewer larger prims to replace my triangular soups? – DonChan Oct 4 '11 at 12:36
Build your objects with larger prims, and use textures to add details. – AttackingHobo Oct 4 '11 at 15:59

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