Editing Pseudoatom (section)

== EXAMPLES FOR USE ==

[[pseudoatom]] can be used for a wide variety of tasks where on must place an atom or a label in 3D space, e.g. as a placeholder for distance measurement or distance specifications.

<source lang="python">
# A pseudoatom as a placeholder for selections according to distance:
load $TUT/1hpv.pdb
pseudoatom tmp, pos=[10.0, 17.0, -3.0]
show sticks, tmp expand 6
delete tmp

# A pseudoatom as placeholder for distance measurement: 
# position it at the center of an aromatic ring.  Then 
# calc the distance from another atom to the pseudoatom.
load $TUT/1hpv.pdb
pseudoatom pi_cent,b/53/cg+cz
dist pi_cent////ps1, b/met`46/ce
</source>

You can use a [[pseudoatom]] to make a label for a scene title. Move the protein to the bottom of the window before the pseudoatom is created. Or move the label after creating it (Shift + Middle mouse button in editing mode).

<source lang="python">
fetch 1rq5
pseudoatom forLabel
label forLabel, "This Protein is a Carbohydrate Active Enzyme"
set label_color, black
# png ray=1
</source>

<gallery widths=300px heights=300px>
Image:Patom.png|You can use a pseudoatom for a movable scene label.
Image:Pseu1.png|Example of using a pseudoatom for distance measurement.
</gallery>