If you want to know which objects are colliding with your object you can use SceneObject.getOverlappingObjects()
From the documentation:
{Array} getOverlappingObjects(searchAllLayers, precision)
Get an array of objects overlapping this object
Parameters:
{boolean} searchAllLayers Optional
Whether to extend the search to all layers. This is false by default, meaning that only overlapping sprites on the same layer will be considered.
{string} precision Optional
How accurately to search for overlaps. This can be either 'axis-aligned' (which would consider the axis-aligned bounding box of the sprites), or 'oriented', which takes into account the rotation of each sprite. Default is 'axis-aligned'.
Returns:
{Array} All the objects that are overlapping this object