SoToU3DAction Class

SoToU3DAction Class

Export a scene graph to a U3D file.

Inheritance Hierarchy

SystemObject
  OIV.InventorSoNetBase
    OIV.Inventor.ActionsSoAction
      OIV.Inventor.ActionsSoCallbackAction
        OIV.HardCopySoToU3DAction
          OIV.HardCopySoToPDFAction

Namespace: OIV.HardCopy
Assembly: OIV.HardCopy (in OIV.HardCopy.dll) Version: 2024.2.0.0 (2024.2.0)

Syntax

C++

Copy

public class SoToU3DAction : SoCallbackAction

Public Class SoToU3DAction
	Inherits SoCallbackAction

public ref class SoToU3DAction : public SoCallbackAction

type SoToU3DAction =  
    class
        inherit SoCallbackAction
    end

The SoToU3DAction type exposes the following members.

Constructors

	Name	Description
	SoToU3DAction	Initializes a new instance of the SoToU3DAction class

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Methods

	Name	Description
	AddLineSegmentCallback	Routine to add callbacks for generated primitives (line segments) for all shapes of the given type. (Inherited from SoCallbackAction.)
	AddPointCallback	Routine to add callbacks for generated primitives (points) for all shapes of the given type. (Inherited from SoCallbackAction.)
	AddPostCallback	Adds a callback function to call when a node of the given type is encountered during traversal. (Inherited from SoCallbackAction.)
	AddPreCallback	Adds a callback function to call when a node of the given type is encountered during traversal. (Inherited from SoCallbackAction.)
	AddTriangleCallback	Routine to add callbacks for generated primitives (triangles) for all shapes of the given type. (Inherited from SoCallbackAction.)
	Apply(SoNode)	Initiates an action on the graph specified by a node. (Overrides SoActionApply(SoNode).)
	Apply(SoPath)	Initiates an action on the graph specified by a path. (Overrides SoActionApply(SoPath).)
	Apply(SoPathList)	Calls Apply(pathList, false).
	Apply(SoPathList, Boolean)	Initiates an action on the graph specified by list of paths. (Overrides SoActionApply(SoPathList, Boolean).)
	AreDraggersExported	Returns true if draggers are exported.
	ClearApplyResult	When applied, an action may reference nodes or create objects (e.g. (Inherited from SoAction.)
	CloseFile	Finalize export to the U3D output file.
	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.)
	ForcePolygonalText3	Forces OIV.Inventor.Nodes.SoText2 nodes to be exported using OIV.Inventor.Nodes.SoText3 (default is true).
	ForwardTraversal(SoNode)	Traverse a node that is not part of the current scenegraph. (Overrides SoActionForwardTraversal(SoNode).)
	ForwardTraversal(SoPath)	Traverse a node that is not part of the current scenegraph. (Overrides SoActionForwardTraversal(SoPath).)
	GetComplexity	Returns complexity information from the state. (Inherited from SoCallbackAction.)
	GetComplexityType	Returns complexity information from the state. (Inherited from SoCallbackAction.)
	GetContinueActionInBranchFlag	This function indicates if the action must stop in the current branch. (Inherited from SoAction.)
	GetCoordinate3	Returns the current coordinates from the state. (Inherited from SoCallbackAction.)
	GetCoordinate4	Returns the current coordinates from the state. (Inherited from SoCallbackAction.)
	GetCreaseAngle	Returns the current shape hints from the state. (Inherited from SoCallbackAction.)
	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	(Inherited from SoCallbackAction.)
	GetDecimationPercentage	Returns the current decimation percentage from the state. (Inherited from SoCallbackAction.)
	GetDecimationType	Returns the current decimation type from the state. (Inherited from SoCallbackAction.)
	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. (Inherited from SoCallbackAction.)
	GetFaceType	Returns the current shape hints from the state. (Inherited from SoCallbackAction.)
	GetFocalDistance	Returns the current camera and viewing information from the state. (Inherited from SoCallbackAction.)
	GetFontName	Returns the current font information from the state. (Inherited from SoCallbackAction.)
	GetFontRenderStyle	Returns the current font information from the state. (Inherited from SoCallbackAction.)
	GetFontSize	Returns the current font information from the state. (Inherited from SoCallbackAction.)
	GetHashCode	Overrides GetHashCode(). (Inherited from SoNetBase.)
	GetLightAttenuation	Returns the current lighting model information from the state. (Inherited from SoCallbackAction.)
	GetLightModel	Returns the current lighting model information from the state. (Inherited from SoCallbackAction.)
	GetLinePattern	Returns the current drawing style information from the state. (Inherited from SoCallbackAction.)
	GetLinePatternScaleFactor	Returns the current drawing style information from the state. (Inherited from SoCallbackAction.)
	GetLineWidth	Returns the current drawing style information from the state. (Inherited from SoCallbackAction.)
	GetMaterial(SbColor, SbColor, SbColor, SbColor, Single, Single)	Calls GetMaterial(ambient, diffuse, specular, emission, shininess, transparency, System.Int32(0)). (Inherited from SoCallbackAction.)
	GetMaterial(SbColor, SbColor, SbColor, SbColor, Single, Single, Int32)	Returns the current material information from the state. (Inherited from SoCallbackAction.)
	GetMaterialBinding	Returns the current material information from the state. (Inherited from SoCallbackAction.)
	GetModelMatrix	Returns the current modeling transformation from the state. (Inherited from SoCallbackAction.)
	GetNodeAppliedTo	Returns the node the action is being applied to. (Inherited from SoAction.)
	GetNormal	Returns the current normal information from the state. (Inherited from SoCallbackAction.)
	GetNormalBinding	Returns the current normal information from the state. (Inherited from SoCallbackAction.)
	GetNumCoordinates	Returns the current coordinates from the state. (Inherited from SoCallbackAction.)
	GetNumNormals	Returns the current normal information from the state. (Inherited from SoCallbackAction.)
	GetNumProfileCoordinates	Returns the current profiles and their coordinates from the state. (Inherited from SoCallbackAction.)
	GetNumTextureCoordinates	Returns texture information from the state. (Inherited from SoCallbackAction.)
	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. (Inherited from SoCallbackAction.)
	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. (Inherited from SoCallbackAction.)
	GetProfile	Returns the current profiles and their coordinates from the state. (Inherited from SoCallbackAction.)
	GetProfileCoordinate2	Returns the current profiles and their coordinates from the state. (Inherited from SoCallbackAction.)
	GetProfileCoordinate3	Returns the current profiles and their coordinates from the state. (Inherited from SoCallbackAction.)
	GetProjectionMatrix	Returns the current camera and viewing information from the state. (Inherited from SoCallbackAction.)
	GetSceneManager	Return the OIV.Inventor.SoSceneManager associated with this action. (Inherited from SoAction.)
	GetShapeType	Returns the current shape hints from the state. (Inherited from SoCallbackAction.)
	GetState	Gets the state from the action. (Inherited from SoAction.)
	GetSwitch	Returns the current switch value. (Inherited from SoCallbackAction.)
	GetTextureBlendColor	Returns texture information from the state. (Inherited from SoCallbackAction.)
	GetTextureCoordinate2	Returns texture information from the state. (Inherited from SoCallbackAction.)
	GetTextureCoordinate4	Returns texture information from the state. (Inherited from SoCallbackAction.)
	GetTextureCoordinateBinding	Returns texture information from the state. (Inherited from SoCallbackAction.)
	GetTextureFileName	Returns texture information from the state. (Inherited from SoCallbackAction.)
	GetTextureImage(SbVec2i32, Int32)	Returns texture information from the state. (Inherited from SoCallbackAction.)
	GetTextureImage(SbVec2s, Int32)	Obsolete. Returns texture information from the state. (Inherited from SoCallbackAction.)
	GetTextureMatrix	Returns the current texture mapping information from the state. (Inherited from SoCallbackAction.)
	GetTextureModel	Returns the current texture mapping information from the state. (Inherited from SoCallbackAction.)
	GetTextureTransformNode	Returns the current texture mapping information from the state. (Inherited from SoCallbackAction.)
	GetTextureWrapS	Returns the current texture mapping information from the state. (Inherited from SoCallbackAction.)
	GetTextureWrapT	Returns the current texture mapping information from the state. (Inherited from SoCallbackAction.)
	GetTransparencyType	Returns the current Transparency Type information from the state. (Inherited from SoCallbackAction.)
	GetType	Gets the Type of the current instance. (Inherited from Object.)
	GetUnits	Returns the current units from the state. (Inherited from SoCallbackAction.)
	GetVertexOrdering	Returns the current shape hints from the state. (Inherited from SoCallbackAction.)
	GetViewingMatrix	Returns the current camera and viewing information from the state. (Inherited from SoCallbackAction.)
	GetViewVolume	Returns the current camera and viewing information from the state. (Inherited from SoCallbackAction.)
	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	(Overrides SoCallbackActionInvokePostCallbacks(SoNode).)
	InvokePreCallbacks	(Overrides SoCallbackActionInvokePreCallbacks(SoNode).)
	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. (Inherited from SoCallbackAction.)
	IsLastPathListAppliedTo	Returns true if the current list is the last one from the original. (Inherited from SoAction.)
	IsPolygonalText3Forced	Returns true if polygonal text3 is forced (see forcePolygonalText3).
	IsUsingAlternateRep	Returns true if current action is using alternate representations. (Inherited from SoAction.)
	OpenFile	Set the U3D output file.
	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. (Inherited from SoCallbackAction.)
	SetExportDraggers	Allow the export of draggers (default is true).
	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	(Inherited from SoCallbackAction.)
	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	(Inherited from SoCallbackAction.)
	PreTailTraversal	(Inherited from SoCallbackAction.)

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Remarks

This class can export an Open Inventor scenegraph to a U3D file. U3D files can be used to import a 3D scene into a PDF file. For a simple PDF export, see OIV.HardCopy.SoToPDFAction.

U3D is a much simpler format than the Open Inventor scene graph and limits what can be exported.

Limitations of U3D:

Cameras
- Multiple cameras are ignored, only the main scenegraph is exported (no legends, logos...).
- PoViews (OIV.Inventor.Gui.View.PoSceneView, OIV.Inventor.Gui.View.PoView, OIV.Inventor.Gui.View.PoBaseView) are not supported.
Lights
- Lights affect the whole scenegraph no matter where they are placed in the scenegraph.
- Per-vertex lighting is precomputed with default lights.
- Two-sided lighting is not supported. Incorrect normals will result in black triangles. However note that the end user can enable two sided rendering in the Acrobat Reader preferences dialog under the "3D & Multimedia" tab.
Lines
- Line width is not supported.
- Per-vertex coloring and lighting are not supported on lines.
- Precision issue on line vertices. Point locations may drasticaly diverge from orginal. Since this problem increases with the number of vertices per shape, try to split lines into smaller shapes.
MeshVizXLM
- Enhanced coloring (MoMaterial) is not supported.
- Fading threshold (MoDrawStyle) is not supported.
- Polygon offset is not supported, so rendering cells with both faces and edges may result in depth buffering problems in the Adobe viewer.
Miscellaneous
- FXViz representations are not supported.
- Engines are ignored.
- Dragger shapes are not exported.
Points
- Coloring is not supported on points.
Rendering
- Modeling clipping (OIV.Inventor.Nodes.SoClipPlane) is ignored.
- Drawstyle is ignored.
- Screen-aligned rendering (OIV.Inventor.Nodes.SoText2, OIV.Inventor.Nodes.SoBillboard, etc) is not supported.
Text
- Text2 and textured Text3 are converted into polygonal Text3.
Textures
- Only MODULATE and REPLACE texture models are supported.
- Only REPEAT and CLAMP texture wraps are supported.
- Multitexturing is not supported.
Transparency
- Transparency is exported, but Adobe Reader's transparency algorithm is limited. Solid objects, MeshVizXLM mesh skin for example, can be handled correctly by Open Inventor's SORTED_PIXEL algorithm, but are not (in general) handled correctly by Adobe Reader (as of version 10.1 anyway).
VolumeViz
- VolumeViz representations are not supported, except orthoslice, obliqueslice and volumeskin.
- VolumeViz slices are exported with their current LOD (NB: LOD is minimal if the node has never been rendered).
- LDM volumes with overlap of zero will not export correctly (gaps between tiles will be visible.
- ROIs are ignored.
- Lighting on VolumeViz slices is not supported.
- VolumeViz slices are exported as simple RGBA textures (no colormap), which impacts visual quality (as if useRGBA field set)

Tips

Node names
- Node names are exported for OIV.Inventor.Nodes.SoSeparator and OIV.Inventor.Nodes.SoShape, as well as all derived classes. These names will appear in the "Model Tree" in Acrobat Reader. The end user can set visibility, render mode, etc for each object. You can also use these names in JavaScript functions that manipulate the model in the PDF file.
- Separator nodes with no assigned name will appear in the tree as "Group-XXX" and Shape nodes with no assigned name will appear in the tree as "Model-XXX", where "XXX" is the address of the node (just to make the name unique).
- Names in the U3D file must be unique. Nodes with duplicate names will have a numeric value automatically appended to their name.
Lights: Lights in the scene graph will be exported. However note that the viewer's headlight will be exported as a directional light with a fixed position (it will not automatically rotate with the camera). If Acrobat Reader finds lights in the U3D file it will use those lights. So it may be better to export without lights and also to turn off the viewer's headlight before exporting to U3D. Note that one of the lighting options in Acrobat Reader is a headlight (that rotates with the camera).
Camera: If the action finds a camera in the scene graph, that camera will define the default view for the model in the PDF file. Therefore if you apply the action to a Separator above the viewer's camera, the exported model will be displayed with the current on-screen view.
Background color: You can export a background color using an OIV.Inventor.Nodes.SoGradientBackground node. The exported color will be the average of the color0 and color1 fields. However you can also change the background color using Adobe Acrobat Pro after inserting the U3D file in a PDF.
Two sided rendering: If the back faces of your geometry are black when displayed in Acrobat Reader, you may want to advise your users to enable the two sided rendering option in Reader's Preferences dialog under the "3D & Multimedia" tab.
Tools:
- You can use the commercial tool Adobe Acrobat Pro to create and modify PDFs with embedded U3D content. Adobe calls this content "3D annotations".
- You can also use open source tools like pdflatex, with the movie15 package, to create a PDF file with embedded 3D from a LaTeX source file.

Use case

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SoSeparator root = new SoSeparator();
...
SoToU3DAction u3dAction = new SoToU3DAction();
bool result = u3dAction.OpenFile( "output.u3d" );
if ( !result )
{
  // Report error
}
u3dAction.Apply( root );
result = u3dAction.CloseFile();
if ( !result )
{
  // Report error
}

Warning

On some platforms, some applications may encounter problems loading, displaying an error message like: "IFXOSFileIterator.ProcessDir: error opening /usr/local/u3d/lib/Plugins/ No such file or directory". In this case, declare the environment variable U3D_LIBDIR (UNIX only) and set it with the path to the Open Inventor libraries ($OIVHOME/lib).
It is now possible to specify a directory name which will contain the U3D plug-ins by setting the environment variable U3D_PLUGINS_DIRNAME for instance: "U3DPlugins". Important: This is not a path to the directory. Moreover this directory must remain in the same folder as fei_ifx_core.so/dll.
By default this action always uses the alternate representation of an OIV.Inventor.Nodes.SoNode derived class (if one exists).
The U3D_LIBDIR path is limited to 103 characters, path plus filename. If this length is exceeded, an error message is outputed and U3D library is not loaded.

Reference

OIV.HardCopy Namespace

OIV.HardCopy.SoToPDFAction