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More robust footprint area calculation with support for IfcSpace floor area

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Dion Moult
2020-08-15 12:40:55 +10:00
parent e9e0dbabe4
commit a1e5135a9e
1 changed files with 19 additions and 18 deletions
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src/ifcblenderexport/blenderbim/bim/qto.py
+19 -18
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@@ -20,7 +20,7 @@ class QtoCalculator():
elif 'perimeter' in prop_name: elif 'perimeter' in prop_name:
return self.get_perimeter(obj) return self.get_perimeter(obj)
elif 'area' in prop_name \ elif 'area' in prop_name \
and ('footprint' in prop_name or 'section' in prop_name): and ('footprint' in prop_name or 'section' in prop_name or 'floor' in prop_name):
return self.get_footprint_area(obj) return self.get_footprint_area(obj)
elif 'area' in prop_name \ elif 'area' in prop_name \
and 'side' in prop_name: and 'side' in prop_name:
@@ -62,6 +62,21 @@ class QtoCalculator():
return (Vector(o.bound_box[1]) - Vector(o.bound_box[0])).length return (Vector(o.bound_box[1]) - Vector(o.bound_box[0])).length
def get_perimeter(self, o): def get_perimeter(self, o):
parsed_edges = []
shared_edges = []
perimeter = 0
for polygon in self.get_lowest_polygons(o):
for edge_key in polygon.edge_keys:
if edge_key in parsed_edges:
shared_edges.append(edge_key)
else:
parsed_edges.append(edge_key)
perimeter += self.get_edge_key_distance(o, edge_key)
for edge_key in shared_edges:
perimeter -= self.get_edge_key_distance(o, edge_key)
return perimeter
def get_lowest_polygons(self, o):
lowest_polygons = [] lowest_polygons = []
lowest_z = None lowest_z = None
for polygon in o.data.polygons: for polygon in o.data.polygons:
@@ -75,19 +90,7 @@ class QtoCalculator():
elif z < lowest_z: elif z < lowest_z:
lowest_polygons = [polygon] lowest_polygons = [polygon]
lowest_z = z lowest_z = z
parsed_edges = [] return lowest_polygons
shared_edges = []
perimeter = 0
for polygon in lowest_polygons:
for edge_key in polygon.edge_keys:
if edge_key in parsed_edges:
shared_edges.append(edge_key)
else:
parsed_edges.append(edge_key)
perimeter += self.get_edge_key_distance(o, edge_key)
for edge_key in shared_edges:
perimeter -= self.get_edge_key_distance(o, edge_key)
return perimeter
def get_edge_key_distance(self, obj, edge_key): def get_edge_key_distance(self, obj, edge_key):
return (obj.data.vertices[edge_key[1]].co - obj.data.vertices[edge_key[0]].co).length return (obj.data.vertices[edge_key[1]].co - obj.data.vertices[edge_key[0]].co).length
@@ -97,10 +100,8 @@ class QtoCalculator():
def get_footprint_area(self, o): def get_footprint_area(self, o):
area = 0 area = 0
for polygon in o.data.polygons: for polygon in self.get_lowest_polygons(o):
if round(polygon.center[2], 3) == 0.0 \ area += polygon.area
and round(o.data.vertices[polygon.vertices[0]].co[2], 3) == 0.0:
area += polygon.area
return area return area
def get_side_area(self, o): def get_side_area(self, o):