ExportToTXT

import bpy

obverts = bpy.context.active_object.data.vertices

vertString = ""

vertString += "vertices = new Vector3[]\n{"
for vertex in obverts:
    vertString += "\n\tnew Vector3 ("
    vertString += str(round(vertex.co[0],5))
    vertString += "f, "
    vertString += str(round(vertex.co[1],5))
    vertString += "f, "
    vertString += str(round(vertex.co[2],5))
    vertString += "f),"

vertString = vertString.rstrip(',')
vertString += "\n};"

obtris = bpy.context.active_object.data.polygons

triString = ""

triString += "triangles = new int[]\n{"
for tri in obtris:
    if len(tri.vertices) > 3:
        raise RuntimeError("You forgot to triangulate the mesh! Go into edit mode, select all, and hit CTRL+T")

    triString += "\n\t"
    triString += str(tri.vertices[0])
    triString += ", "
    triString += str(tri.vertices[1])
    triString += ", "
    triString += str(tri.vertices[2])
    triString += ","

triString = triString.rstrip(',')
triString += "\n};"

file = open('D:\\Libraries\\Documents\\Unity Projects\\RESTOFPATH\\meshData.txt', 'w')

file.write(vertString + "\n\n" + triString)

print("Export Successful!")