According to the documentation, the compute_collisions() method should return
two lists of identical length, listing the colliding BoundingBoxes of two BoundingBoxTrees.
In this example, I don't see that.
from dolfin import *
coarse = UnitSquareMesh(2, 2)
cb = BoundingBoxTree()
cb.build(coarse)
fine = UnitSquareMesh(5, 5)
fb = BoundingBoxTree()
fb.build(fine)
print cb.compute_collisions(fb)
(array([0, 1, 2, 3, 4, 5, 6, 7], dtype=uint32), array([ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49], dtype=uint32))
What am I doing wrong? How can I get a list of colliding cells (or cells which may collide based on their BoundingBox) ?
