def areas_from_polygons(verts, polygons, sum_faces=False):
'''
returns pols area as [float, float,...]
vertices: list as [vertex, vertex, ...], being each vertex [float, float, float].
faces: list as [polygon, polygon,..], being each polygon [int, int, ...].
sum_faces if True it will return the sum of the areas as [float]
'''
areas = []
concat_area = areas.append
for polygon in polygons:
num = len(polygon)
if num == 3:
concat_area(
area(verts[polygon[0]], verts[polygon[1]], verts[polygon[2]]))
elif num == 4:
area_1 = area(verts[polygon[0]], verts[polygon[1]],
verts[polygon[2]])
area_2 = area(verts[polygon[0]], verts[polygon[2]],
verts[polygon[3]])
concat_area(area_1 + area_2)
elif num > 4:
ngon_area = 0.0
subcoords = [Vector(verts[idx]) for idx in polygon]
for tri in tessellate([subcoords]):
ngon_area += area(*[verts[polygon[i]] for i in tri])
concat_area(ngon_area)
else:
concat_area(0)
if sum_faces:
areas = [sum(areas)]
return areas
def areas_from_polygons(verts, polygons, sum_faces=False):
areas = []
concat_area = areas.append
for polygon in polygons:
num = len(polygon)
if num == 3:
concat_area(
area(verts[polygon[0]], verts[polygon[1]], verts[polygon[2]]))
elif num == 4:
area_1 = area(verts[polygon[0]], verts[polygon[1]],
verts[polygon[2]])
area_2 = area(verts[polygon[0]], verts[polygon[2]],
verts[polygon[3]])
concat_area(area_1 + area_2)
elif num > 4:
ngon_area = 0.0
subcoords = [Vector(verts[idx]) for idx in polygon]
for tri in tessellate([subcoords]):
ngon_area += area(*[verts[polygon[i]] for i in tri])
concat_area(ngon_area)
else:
concat_area(0)
if sum_faces:
areas = [sum(areas)]
return areas
