containsPoint 
  Checks whether the given @point is contained in the volume of a #graphene_sphere_t.
Return
true if the sphere contains the point
Since
1.2
Parameters
point
a #graphene_point3d_t
Checks whether the given @point is contained in the volume of a #graphene_sphere_t.
true if the sphere contains the point
1.2
a #graphene_point3d_t