To display 3D and 2D objects, they must be added to the
Scene object first. In the default
Scene object, this happens automatically when an
object (e.g. a NPart object) that can be rendered
is created. Responsible for this is the automatic_add
setting, which is enabled in the default Scene
object. However, in any additional Scene object,
it is not enabled by default. This setting can be changed in the GUI by
first selecting the Scene object and then by
toggling the respective check box on the "General" page of the editor.
In Python, the same is achieved by setting
my_scene.automatic_add = True
To manually add an object to a Scene
object, just drag and drop the object from the tree widget into the
Scene window, or drop it on the
Scene object in the tree widget. In Python, this
is done by means of the "add" function:
my_scene.add(p)
When the first 3D object is added, the
Scene object performs an automatic re-scale, so
that the object becomes entirely visible. This re-scaling is not applied
when more objects are added.
What happens when an object is added twice? The
Scene object always checks if the object already
has been added. If this is the case, nothing happens.
To remove an object from a Scene with the
GUI, select the Scene object in the tree widget
and expand it. Then, right-click on the child object to be removed to
obtain its context menu. There, select Remove from
Scene. In Python:
my_scene.remove(p)
