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[ewind]

At present I have a project about building a small Transportation System including roads, buildings, trees. i used C# with DirectX
At first, I write a editor in which users can build their system. For example, users can create a node for the crossroad, a segment for a path, create a tree, a house, etc.
Then I automatically convert them to 3D.
But I don't know the way to convert them.
How can we create a mesh? How can we know the vertex, textutre,...?
Or we have another method?
Please help me.

[Reedbeta]

You should probably find or make (with a 3D modelling software) some "prefab" models of houses, trees, road segments and curves and so forth. Then you can just place these in the 3D world wherever the user wants them.