Grasshopper

algorithmic modeling for Rhino

first i´m very "new" with grasshopper. i studied some video tutorials and i want to start with an architectural project for a design class at tu vienna.
i want to integrate the sunpath of a certain region into the design of some buildings and their fassade.
first i found a sunpath generator through sketch up (free version).from the resulted KMZ file, i extracted the file with a DAE extension (.dae). i could open it in blender and transformed it there into a dxf/dwg file, which i imported into rhino.
the objects appear their as polygon meshes - the problem is, i can´t use the object snap on those ploygon meshes - there is no interaction, but i can select it.
why doesn´t it show any endpoints,....? it seems, the object is a block, but i don´t know how to "explode" it.
please, it would be great, if somebody knows a solution.

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h mi
it is just a geometrical problem
meshes have no endpoints snap, so you have to activate the point snap or in rhino 5 wip the vertex snap
- to]
thnx so much -to] you

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