First attempt at implementation of intersection clash checks.

This considers only protruding clashes. It does not consider touching nor encroaching clashes and does not consider protrusion direction in the protrusion distance.

src/ifcwrap/IfcGeomWrapper.i

@@ -106,6 +106,14 @@
 		return IfcGeom_tree_vector_to_list(ps);
 	}
 
+	aggregate_of_instance::ptr clash_intersection(IfcUtil::IfcBaseClass* e, double tolerance = 0.002) const {
+		if (!e->declaration().is("IfcProduct")) {
+			throw IfcParse::IfcException("Instance should be an IfcProduct");
+		}
+		std::vector<IfcUtil::IfcBaseEntity*> ps = $self->clash_intersection((IfcUtil::IfcBaseEntity*)e, tolerance);
+		return IfcGeom_tree_vector_to_list(ps);
+	}
+
 	aggregate_of_instance::ptr select(IfcUtil::IfcBaseClass* e, bool completely_within = false, double extend = 0.0) const {
 		if (!e->declaration().is("IfcProduct")) {
 			throw IfcParse::IfcException("Instance should be an IfcProduct");

src/ifcwrap/IfcPython.i

@@ -206,4 +206,5 @@
 	
 namespace std {
   %template(float_array_3) array<double, 3>;
+  %template(vector_float_array_3) vector<array<double, 3>>;
 }