Completely replaced the homebrew Pointf3 class with Eigen Vec3d.

Replaced the unscale macro with a template, implemented templates
for unscaling Eigen vectors.

xs/xsp/typemap.xspt

@@ -25,9 +25,9 @@
 %typemap{Pointf*};
 %typemap{Ref<Pointf>}{simple};
 %typemap{Clone<Pointf>}{simple};
-%typemap{Pointf3*};
-%typemap{Ref<Pointf3>}{simple};
-%typemap{Clone<Pointf3>}{simple};
+%typemap{Vec3d*};
+%typemap{Ref<Vec3d>}{simple};
+%typemap{Clone<Vec3d>}{simple};
 %typemap{BoundingBox*};
 %typemap{Ref<BoundingBox>}{simple};
 %typemap{Clone<BoundingBox>}{simple};