Class TAbstractGroupingNode

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Constructor. Initializes various properties:

• Name, BaseUrl are initialized from given parameters.

• The Fields, Events lists are filled in every descendant, to have all the fields/events defined by the specification.

• DefaultContainerField, and other node-specific stuff, is filled in descendants. This is actually implemented in CreateNode, that is called at the end of this constructor.

Add the nodes as children.

By default, adding the same node multiple times makes the node present on the list multiple times. This AddChildren behavior is consistent with how FdChildren.Add(Child) behaves, and consistent with how RemoveChildren works (it removes only a single copy in case of duplicates). Our engine allows duplicates on the children list — you can specify them in the X3D file, or you can add them using FdChildren.Add.

If you specify AllowDuplicates = False, then adding a node that already exists on the children list is ignored. This has a tiny performance hit (we need to check for existence first), but it is consistent with how X3D event "addChildren" should behave according to the spec. The X3D specification doesn't allow duplicates on the children list.

This propagates the changes appropriately to the parent TCastleSceneCore, calling TCastleSceneCore.ChangedAll or something similar.

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Remove the nodes from the children list. Removing a node that does not exist on the children list is ignored.

If a node exists on the current children list multiple times, then a single occurrence of this node is removed, for each occurrence of this node in the parameters list.

This propagates the changes appropriately to the parent TCastleSceneCore, calling TCastleSceneCore.ChangedAll or something similar.

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Clear all children from the list. This automatically propagates the changes appropriately to the parent TCastleSceneCore.

Create node fields and events.

This item has no description. Showing description inherited from TX3DNode.ClassX3DType.

Node type name in VRML/X3D, for this class. Normal VRML/X3D node classes should override this to return something non-empty, and then X3DType automatically will return the same value.

Empty for classes that don't have a hardcoded VRML/X3D node name, like a special TX3DUnknownNode. Such special classes should override then X3DType to return actual non-empty name there.

You usually should call X3DType. The only use of this method is that it works on classes (it's "class function"), without needing at actual instance.

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Internal wrapper for property Children. This wrapper API may change, we advise to access simpler Children instead, if it is defined (TODO: for now, some field types do not have a simpler counterpart).

Internal wrapper for property BboxCenter. This wrapper API may change, we advise to access simpler BboxCenter instead, if it is defined (TODO: for now, some field types do not have a simpler counterpart).

You can provide a manually-calculated bounding box of the group here, for optimization purposes. Ignored for now. Leave this field as empty (TBox3D.Empty) to let the engine calculate best bounding box automatically.

See also

TAbstractShapeNode.BBox

You can provide a manually-calculated bounding box of the shape here, for optimization purposes.

Internal wrapper for property BboxSize. This wrapper API may change, we advise to access simpler BboxSize instead, if it is defined (TODO: for now, some field types do not have a simpler counterpart).

Internal wrapper for property Visible. This wrapper API may change, we advise to access simpler Visible instead, if it is defined (TODO: for now, some field types do not have a simpler counterpart).

Is this group visible (not implemented yet). While this is not implemented for an entire group, note that you can use TAbstractShapeNode.Visible to toggle visibility of each shape.

Internal wrapper for property BboxDisplay. This wrapper API may change, we advise to access simpler BboxDisplay instead, if it is defined (TODO: for now, some field types do not have a simpler counterpart).

Is the bounding box of this group visible (not implemented yet). While this is not implemented for an X3D group, note that you can use TDebugTransformBox to easily display bounding box of a whole TCastleTransform.