SoCallbackAction Class

Performs a generic traversal of a scene graph or path.

Inheritance Hierarchy

SystemObject
  OIV.InventorSoNetBase
    OIV.Inventor.ActionsSoAction
      OIV.Inventor.ActionsSoCallbackAction
        OIV.HardCopySoToU3DAction
        OIV.Inventor.IO.STLSoSTLWriteAction

Namespace: OIV.Inventor.Actions
Assembly: OIV.Inventor (in OIV.Inventor.dll) Version: 2024.2.2.0 (10.16.2.0)

Syntax

C++

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public class SoCallbackAction : SoAction

Public Class SoCallbackAction
	Inherits SoAction

public ref class SoCallbackAction : public SoAction

type SoCallbackAction =  
    class
        inherit SoAction
    end

The SoCallbackAction type exposes the following members.

Constructors

	Name	Description
	SoCallbackAction	The constructor.

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Methods

	Name	Description
	AddLineSegmentCallback	Routine to add callbacks for generated primitives (line segments) for all shapes of the given type.
	AddPointCallback	Routine to add callbacks for generated primitives (points) for all shapes of the given type.
	AddPostCallback	Adds a callback function to call when a node of the given type is encountered during traversal.
	AddPreCallback	Adds a callback function to call when a node of the given type is encountered during traversal.
	AddTriangleCallback	Routine to add callbacks for generated primitives (triangles) for all shapes of the given type.
	Apply(SoNode)	Initiates an action on the graph defined by a node. (Inherited from SoAction.)
	Apply(SoPath)	Initiates an action on the graph defined by a path. (Inherited from SoAction.)
	Apply(SoPathList)	Calls Apply(pathList, false). (Inherited from SoAction.)
	Apply(SoPathList, Boolean)	Initiates an action on the graph defined by a list of paths. (Inherited from SoAction.)
	ClearApplyResult	When applied, an action may reference nodes or create objects (e.g. (Inherited from SoAction.)
	EnableElement
	EnableElements	Obsolete. Returns the list of enabled elements for a given action subclass. (Inherited from SoAction.)
	Equals	Determines whether the specified Object is equal to the current Object. (Inherited from Object.)
	ForwardTraversal(SoNode)	Traverse a node that is not part of the current scenegraph. (Inherited from SoAction.)
	ForwardTraversal(SoPath)	Traverse a path that is not part of the current scenegraph. (Inherited from SoAction.)
	GetComplexity	Returns complexity information from the state.
	GetComplexityType	Returns complexity information from the state.
	GetContinueActionInBranchFlag	This function indicates if the action must stop in the current branch. (Inherited from SoAction.)
	GetCoordinate3	Returns the current coordinates from the state.
	GetCoordinate4	Returns the current coordinates from the state.
	GetCreaseAngle	Returns the current shape hints from the state.
	GetCurPath	Returns the path accumulated during traversal, i.e., the chain of nodes from the root of the traversed graph to the current node being traversed. (Inherited from SoAction.)
	GetCurrentResponse
	GetDecimationPercentage	Returns the current decimation percentage from the state.
	GetDecimationType	Returns the current decimation type from the state.
	GetDistribMode	Returns the distribution mode of this action across a cluster (ScaleViz-Cluster only). (Inherited from SoAction.)
	GetDrawStyle	Returns the current drawing style information from the state.
	GetFaceType	Returns the current shape hints from the state.
	GetFocalDistance	Returns the current camera and viewing information from the state.
	GetFontName	Returns the current font information from the state.
	GetFontRenderStyle	Returns the current font information from the state.
	GetFontSize	Returns the current font information from the state.
	GetHashCode	Overrides GetHashCode(). (Inherited from SoNetBase.)
	GetLightAttenuation	Returns the current lighting model information from the state.
	GetLightModel	Returns the current lighting model information from the state.
	GetLinePattern	Returns the current drawing style information from the state.
	GetLinePatternScaleFactor	Returns the current drawing style information from the state.
	GetLineWidth	Returns the current drawing style information from the state.
	GetMaterial(SbColor, SbColor, SbColor, SbColor, Single, Single)	Calls GetMaterial(ambient, diffuse, specular, emission, shininess, transparency, System.Int32(0)).
	GetMaterial(SbColor, SbColor, SbColor, SbColor, Single, Single, Int32)	Returns the current material information from the state.
	GetMaterialBinding	Returns the current material information from the state.
	GetModelMatrix	Returns the current modeling transformation from the state.
	GetNodeAppliedTo	Returns the node the action is being applied to. (Inherited from SoAction.)
	GetNormal	Returns the current normal information from the state.
	GetNormalBinding	Returns the current normal information from the state.
	GetNumCoordinates	Returns the current coordinates from the state.
	GetNumNormals	Returns the current normal information from the state.
	GetNumProfileCoordinates	Returns the current profiles and their coordinates from the state.
	GetNumTextureCoordinates	Returns texture information from the state.
	GetOriginalPathListAppliedTo	Returns the original path list the action is being applied to. (Inherited from SoAction.)
	GetPathAppliedTo	Returns the path the action is being applied to. (Inherited from SoAction.)
	GetPathCode	Returns path code based on where current node (the node at the end of the current path) lies with respect to the path(s) the action is being applied to. (Inherited from SoAction.)
	GetPathListAppliedTo	Returns the path list the action is being applied to. (Inherited from SoAction.)
	GetPickStyle	Returns the current picking style.
	GetPipeId	Gets pipe identifier in the range [1..N] associated to this render action while running a ScaleViz Multipipe configuration. (Inherited from SoAction.)
	GetPointSize	Returns the current drawing style information from the state.
	GetProfile	Returns the current profiles and their coordinates from the state.
	GetProfileCoordinate2	Returns the current profiles and their coordinates from the state.
	GetProfileCoordinate3	Returns the current profiles and their coordinates from the state.
	GetProjectionMatrix	Returns the current camera and viewing information from the state.
	GetSceneManager	Return the OIV.Inventor.SoSceneManager associated with this action. (Inherited from SoAction.)
	GetShapeType	Returns the current shape hints from the state.
	GetState	Gets the state from the action. (Inherited from SoAction.)
	GetSwitch	Returns the current switch value.
	GetTextureBlendColor	Returns texture information from the state.
	GetTextureCoordinate2	Returns texture information from the state.
	GetTextureCoordinate4	Returns texture information from the state.
	GetTextureCoordinateBinding	Returns texture information from the state.
	GetTextureFileName	Returns texture information from the state.
	GetTextureImage(SbVec2i32, Int32)	Returns texture information from the state.
	GetTextureImage(SbVec2s, Int32)	Obsolete. Returns texture information from the state.
	GetTextureMatrix	Returns the current texture mapping information from the state.
	GetTextureModel	Returns the current texture mapping information from the state.
	GetTextureTransformNode	Returns the current texture mapping information from the state.
	GetTextureWrapS	Returns the current texture mapping information from the state.
	GetTextureWrapT	Returns the current texture mapping information from the state.
	GetTransparencyType	Returns the current Transparency Type information from the state.
	GetType	Gets the Type of the current instance. (Inherited from Object.)
	GetUnits	Returns the current units from the state.
	GetVertexOrdering	Returns the current shape hints from the state.
	GetViewingMatrix	Returns the current camera and viewing information from the state.
	GetViewVolume	Returns the current camera and viewing information from the state.
	GetWhatAppliedTo	Returns code indicating what action is being applied to. (Inherited from SoAction.)
	HasTerminated	Returns true if the traversal has reached a termination condition. (Inherited from SoAction.)
	InvalidateState	Invalidates the current traversal state in the action, forcing it to be recreated when the action is next applied. (Inherited from SoAction.)
	InvokePostCallbacks
	InvokePreCallbacks
	IsBeingApplied	Returns true if this action is currently being applied. (Inherited from SoAction.)
	IsCallbackAll	Returns whether the callback uses normal traversal (switches, etc.) or whether it traverses every single node.
	IsLastPathListAppliedTo	Returns true if the current list is the last one from the original. (Inherited from SoAction.)
	IsUsingAlternateRep	Returns true if current action is using alternate representations. (Inherited from SoAction.)
	PostDelayedTraversal	Method called by SoMultiPassManager after delayed pass traversals. (Inherited from SoAction.)
	PreDelayedTraversal	Method called by SoMultiPassManager before delayed pass traversals. (Inherited from SoAction.)
	ResetContinueActionInBranchFlag	This function resets the continue action flag. (Inherited from SoAction.)
	SetCallbackAll	Sets whether the callback uses normal traversal (switches, etc.) or whether it traverses every single node.
	SetPipeId	Sets pipe identifier in the range [1..N] associated to this render action while running a ScaleViz Multipipe configuration. (Inherited from SoAction.)
	SetSceneManager	Set the scene manager associated with this action (if any ). (Inherited from SoAction.)
	SetUpState	Creates state if it is NULL or it is no longer valid because new elements have been enabled since it was created. (Inherited from SoAction.)
	ShouldGeneratePrimitives
	StopActionInBranch	This function stops the action in the current Scene Graph branch. (Inherited from SoAction.)
	ToString	Returns a string that represents the current object. (Inherited from Object.)
	Traverse	Does traversal of a graph rooted by a node. (Inherited from SoAction.)
	UseAlternateRep	Tell the action to use alternate representations during traversal when available. (Inherited from SoAction.)

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Events

	Name	Description
	PostTailTraversal
	PreTailTraversal

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Remarks

Performs a generic traversal of a scene graph or path. In many cases a "custom" action can be implemented using OIV.Inventor.Actions.SoCallbackAction with much less complexity than deriving a completely new action class.

The application can specify delegate methods that will be called when the action traverses a node of the specified class or a derived class. For example a callback for the OIV.Inventor.Nodes.SoCone class will only be called for OIV.Inventor.Nodes.SoCone nodes, but a callback for the OIV.Inventor.Nodes.SoShape class will be called for any type of shape node.

This makes OIV.Inventor.Actions.SoCallbackAction flexible and very convenient for "visiting" a set of nodes, especially when you only need the node itself and not a path to the node. For example, to count all the shapes in the scene graph. It is possible to get the path to the node being visited (see GetCurPath()), but OIV.Inventor.Actions.SoSearchAction may be more convenient for getting a path to one or a small number of nodes.

In addition, delegatemethods can be registered to collect the primitives (trangles, lines and points) generated by shapes in the scene graph. These primitives are the actual geometry if the shape contains triangles, lines or points, else they represent or approximate the actual geometry. NOTE: Most, but not all, shapes can generate primitives. See below for a complete list. Triangle primitives are used for all surfaces (such as cubes, face sets, or 3D text), line segment primitives are used for line shapes, and point primitives are used for point shapes. Note that the type of primitives generated for a shape is the same, regardless of drawing style or other properties.

Most of the methods on this class access information from the traversal state. They should be called only by delegatefunctions that are invoked during traversal, so there is a valid state to work with.

EXAMPLE

Apply a callback action to visit all shape nodes.

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SoCallbackAction action = new SoCallbackAction();
action.AddPreCallback     ( typeof(SoShape), new SoCallbackAction.CallbackActionCB(NodeCallback) );
action.AddTriangleCallback( typeof(SoShape), new SoCallbackAction.TriangleCB(TriangleCallback) );
action.Apply( root );

This method will be called for each shape node in the scene graph.

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SoCallbackAction.Responses NodeCallback(SoCallbackAction action, SoNode node)
{
   Console.WriteLine("Shape \"" + node.GetName() + "\": " + node.GetType());
   return SoCallbackAction.Responses.CONTINUE;
}

This method will be called for each triangle in the shape node.

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void TriangleCallback( SoCallbackAction action,
             ref SoPrimitiveVertex vertex1,
             ref SoPrimitiveVertex vertex2,
             ref SoPrimitiveVertex vertex3)
{
   Console.WriteLine("  Triangle:");
   printVertex( vertex1, "1" );
   printVertex( vertex2, "2" );
   printVertex( vertex3, "3" );
}
void printVertex( SoPrimitiveVertex vertex, String label )
{
   SbVec3f point = vertex.Point;
   Console.WriteLine("    Vert{0} = ({1}, {2}, {3})", label, point[0], point[1], point[2]);
}

Example output:

Shape "": SoCone
 Triangle:
   Vert1 = 0.0, -1.0, -1.0
   Vert2 = 0.0, 1.0, -0.0
   Vert3 = 0.38268346, -1.0, -0.9238795
 Triangle:
   Vert1 = 0.38268346, -1.0, -0.9238795
   Vert2 = 0.0, 1.0, -0.0
   Vert3 = 0.0, 1.0, -0.0
 . . .
*

Reference

OIV.Inventor.Actions Namespace

OIV.Inventor.Nodes.SoCallback

OIV.Inventor.Nodes.SoEventCallback

OIV.Inventor.Nodes.SoShape