Illustrates the use of BoundingBoxFromEntity().
# This code example shows how to calculate and display an oriented bounding box # that contains all the atoms of an entity. # remove all objects from scene, just in case scene.RemoveAll() # Load sdh molecule sdh=io.LoadPDB('data/sdh.pdb') # Select backbone atoms of residues 99-128, which form a helix. helix=sdh.Select('rnum=99:128 and cname=A and aname=CA,C,N,O') # create a graphical representation of the helix and render it with simple # lines. go=gfx.Entity('helix', gfx.SIMPLE, helix) # add it to the scene scene.Add(go) # calculate the bounding box for the helix bbox=mol.BoundingBoxFromEntity(helix) # create a graphical representation of the bounding box and add it to the scene bb=gfx.Cuboid('xxx', bbox) bb.SetFillColor(gfx.Color(0.5, 0.8, 0.5, 0.2)) scene.Add(bb) # center the camera on the graphical object scene.center=go.center