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# remove all objects from scene, just in case
scene.RemoveAll()
# Load chain A of SDH
ent = io.LoadPDB('data/sdh.pdb', restrict_chains='A')
# create graphics object
go = gfx.Entity('SDH', ent)
# set rendermode of full graphical object to interpolated spline
go.SetRenderMode(gfx.SLINE)
# select sidechains (including bond to C-alpha and N in case of proline)
sidechains = ent.Select('aname!=CA,C,N,O', mol.EXCLUSIVE_BONDS)
# set rendering of sidechains to simple
go.SetRenderMode(gfx.SIMPLE, sidechains)
# add object to scene
scene.Add(go)
# center the scene on the geometric center of the SDH
scene.CenterOn(go)
print('Demo 1: loading and displaying a pdb file')
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