> I need to identify the sharp edges (i.e. polygons which create edges

> with sharp angles by taking dot product of normals) and store the

> coordinates of their vertices. Could anyone help me with this

> please...

Not unless you more clearly define where, in this procedure, your

problem is. The task is really simple, assuming you have those

polygons described by an appropriate data structure. Just iterate over

it, check, and write out the list of results. To help more precisely,

we need to know details about your data structure, and what the

exact problem is you're having with it.

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Even if all the snow were burnt, ashes would remain.