@ -149,10 +149,10 @@ def draw_polygons(self,
grid_coord = numpy.digitize(point, edges) - 1
w_coord = grid_coord - bdi_min[surface_normal]
if grid_coord < 0:
if w_coord < 0:
w_coord = 0
f = 0
elif grid_coord >= w_z.size:
elif w_coord >= w_z.size:
w_coord = w_z.size - 1
f = 1
else: