SoValueOrdering Class |
Note: This API is now obsolete.
Group node derived from SoRenderList that alters the decimation of shapes below it depending on their rendering value as approximated by their size on the screen.
Namespace: OIV.Inventor.Nodes
The SoValueOrdering type exposes the following members.
Name | Description | |
---|---|---|
![]() | SoValueOrdering | Default constructor. |
![]() | SoValueOrdering(Int32) | Constructor that takes approximate number of children as a hint. |
Name | Description | |
---|---|---|
![]() | AddChild | Adds a child as last one in group. |
![]() | AddRenderObjectName | Adds a new name to the search list. |
![]() | AddRenderObjectType | Adds a new type to the search list. |
![]() | AffectsState | (Inherited from SoSeparator.) |
![]() | Callback | (Inherited from SoSeparator.) |
![]() | ClearCacheList | (Inherited from SoSeparator.) |
![]() | Copy | Calls Copy(false). (Inherited from SoNode.) |
![]() | Copy(Boolean) | Creates and returns an exact copy of the node. |
![]() | CopyFieldValues(SoFieldContainer) | Calls CopyFieldValues(fc, false). (Inherited from SoFieldContainer.) |
![]() | CopyFieldValues(SoFieldContainer, Boolean) | Copies the contents of fc's fields into this object's fields. |
![]() | Dispose |
Releases all resources used by SoDisposable.
(Inherited from SoDisposable.) |
![]() | Distribute | (Inherited from SoSeparator.) |
![]() | DoAction | (Inherited from SoSeparator.) |
![]() | EnableNotify | Notification at this Field Container is enabled (if flag == true) or disabled (if flag == false). |
![]() | Equals | (Inherited from Object.) |
![]() | FieldsAreEqual | Returns true if this object's fields are exactly equal to fc's fields. |
![]() | FindChild | Finds index of given child within group. |
![]() | Get | Returns the values of the fields of this object in the Open Inventor ASCII file format in the given string. |
![]() | GetAllFields | Returns a list of fields, including the eventIn's and eventOut's. |
![]() | GetAlternateRep | This method is called by actions to allow the node to provide an "alternate representation" when appropriate (typically depending on the action type). |
![]() | GetBoundingBox | (Overrides SoSeparatorGetBoundingBox(SoGetBoundingBoxAction).) |
![]() | GetChild | Returns pointer the child node with the given index. |
![]() | GetEventIn | Returns a the eventIn with the given name. |
![]() | GetEventOut | Returns the eventOut with the given name. |
![]() | GetField | Returns a the field of this object whose name is fieldName. |
![]() | GetFieldName | Returns the name of the given field in the fieldName argument. |
![]() | GetFields | Appends references to all of this object's fields to resultList, and returns the number of fields appended. |
![]() | GetHashCode |
Overrides GetHashCode().
(Inherited from SoNetBase.) |
![]() | GetMatrix | (Inherited from SoSeparator.) |
![]() | GetName | Returns the name of an instance. |
![]() | GetNumChildren | Returns number of children. |
![]() | GetNumRenderObjectNames | Returns number of names in the search list. |
![]() | GetNumRenderObjectTypes | Returns number of types in the search list. |
![]() | GetPrimitiveCount | (Overrides SoSeparatorGetPrimitiveCount(SoGetPrimitiveCountAction).) |
![]() | GetRenderObjectName | Returns the i th name of the search list. |
![]() | GetRenderObjectType | Returns the i th type of the search list. |
![]() | GetRenderUnitID | (Inherited from SoNode.) |
![]() | GetStringName | (Inherited from SoBase.) |
![]() | GetType | Gets the Type of the current instance. (Inherited from Object.) |
![]() | GLRender | (Inherited from SoSeparator.) |
![]() | GLRenderBelowPath | (Overrides SoSeparatorGLRenderBelowPath(SoGLRenderAction).) |
![]() | GLRenderInPath | (Inherited from SoSeparator.) |
![]() | GLRenderOffPath | (Inherited from SoSeparator.) |
![]() | GrabEventsCleanup | (Inherited from SoNode.) |
![]() | GrabEventsSetup | (Inherited from SoNode.) |
![]() | HandleEvent | (Inherited from SoSeparator.) |
![]() | HasDefaultValues | Returns true if all of the object's fields have their default values. |
![]() | InsertChild | Adds a child so that it becomes the one with the given index. |
![]() | IsBoundingBoxIgnoring | Used by BoundingBoxAction to known if bounding box computation should be ignored or not. |
![]() | IsNotifyEnabled | Notification is the process of telling interested objects that this object has changed. |
![]() | IsOverride | Returns the state of the override flag. |
![]() | IsSynchronizable | Gets the ScaleViz synchronizable state of this object. |
![]() | Pick | (Overrides SoGroupPick(SoPickAction).) |
![]() | RayPick | (Inherited from SoSeparator.) |
![]() | RemoveAllChildren | Removes all children from group. |
![]() | RemoveAllRenderObjectNames | Clears all names from the search list. |
![]() | RemoveChild(Int32) | Removes child with given index from group. |
![]() | RemoveChild(SoNode) | Removes first instance of given child from group. |
![]() | RemoveRenderObjectName | Removes a name from the search list. |
![]() | RemoveRenderObjectType | Removes a type from the search list. |
![]() | ReplaceChild(Int32, SoNode) | Replaces child with given index with new child. |
![]() | ReplaceChild(SoNode, SoNode) | Replaces first instance of given child with new child. |
![]() | Search | (Inherited from SoSeparator.) |
![]() | Set | Sets one or more fields in this object to the values specified in the given string, which should be a string in the Open Inventor file format. |
![]() | SetName | (Inherited from SoBase.) |
![]() | SetOverride | Turns the override flag on or off. |
![]() | SetSynchronizable | Sets this to be a ScaleViz synchronizable object. |
![]() | SetToDefaults | Sets all fields in this object to their default values. |
![]() | ToString |
Converts this SoBase structure to a human readable string.
(Inherited from SoBase.) |
![]() | Touch | Marks an instance as modified, simulating a change to it. |
![]() | Write | (Inherited from SoGroup.) |
Name | Description | |
---|---|---|
![]() | adjustDecimation | Allows ValueOrdering node to adjust decimation percentage value depending on the shape's rendering value. |
![]() | boundingBoxCaching | Whether to cache during bounding box traversal. |
![]() | boundingBoxIgnoring | Whether to ignore this node during bounding box traversal. |
![]() | boundingBoxSubstitutes | Enables use of bounding boxes for shapes whose rendering value is too low to render the shape itself. |
![]() | decimateSubstitutes | If true, then this node will automatically decide when a decimated version of a shape needs to be created. |
![]() | directVizCaching | Whether to cache during OpenRTRT rendering traversal. |
![]() | dropCulling | Enables culling of shapes that are too small on the screen. |
![]() | dropScreenArea | Sets threshold in pixels for drop culling. |
![]() | fastEditing | Specifies the fast edit mode of the separator node. |
![]() | IsDisposable | ISafeDisposable interface implementation.
(Inherited from SoDisposable.) |
![]() | isHead | Normally each culling node maintains its own render list. |
![]() | lowValueCulling | Enables culling of shapes whose rendering value is too low. |
![]() | pickCulling | Whether to cull during picking traversal. |
![]() | renderCaching | Whether to cache during rendering traversal. |
![]() | renderCulling | Whether to cull during rendering traversal. |
![]() | renderUnitId | Used during the ScaleViz depth compositing process, this field specifies which render unit (OIRU) will render the sub scene graph below this separator. |
![]() | UserData |
Gets or sets the user data to be contained by the field container.
(Inherited from SoFieldContainer.) |
This makes it possible to render scenes with large numbers of shapes without needing LOD nodes.
The SoValueOrdering node uses the functionality from SoRenderList to create a list of paths to the shapes beneath it. It then traverses the linear list and determines the rendering value and cost of each shape. The rendering value is based on the object's approximate screen size and its cost is based on a count of the number of primitives the shape contains.
<font color="#0000FF">NOTE:</font> This class does not exist in Open Inventor 10.0 and later.
During each render traversal, the ValueOrdering node determines how many primitives a shape deserves based on its rendering value. If the shape contains multiple levels of detail, then the ValueOrdering node will choose the correct level of detail. However, this node also has two techniques that allow it to handle scenes that do not contain levels of detail: bounding box substitutes and drop culling.
With drop culling enabled, a user can specify a size in pixels such that when the shape is less than this size, the shape is not rendered.
If bounding box substitutes are enabled and the ValueOrdering node calculates that the number of triangles that the object deserves is closer to 12 (the number of triangles in a bounding box) than to the minimum number of triangles the shape can draw, then the ValueOrdering node will draw a bounding box instead of the shape.
If decimate substitutes are enabled, then the ValueOrdering will apply an SoGlobalSimpifyAction to shapes that it determines need simplification. Sometimes a shape has so many triangles that neither the bounding box nor the shape is a satisfactory choice given the shape's calculated value. In this case, the ValueOrdering will create and use a simplified version. The simplification is done when Inventor has been idle for over a second.
If low value culling is enabled, then the shape will not be rendered if the ValueOrdering node decides that its value in triangles is not even worth rendering a bounding box. This will happen if the decimation percentage value is set very low.
The typical scenario where this node is useful is in CAD model assembly viewing, where all or most of the scene is visible, but lots of details may be so small that there is no point in drawing them until the user zooms in on them. Replacing such detail with its bounding box is adequate in many cases and does not have the disk and memory costs, along with the preprocessing time, associated with maintaining multiple levels of detail.
ValueOrdering {
dropCulling | true |
dropScreenArea | 5 |
boundingBoxSubstitutes | true |
decimateSubstitutes | true |
lowValueCulling | true |
adjustDecimation | true |
isHead | true |
renderCaching | AUTO |
boundingBoxCaching | AUTO |
renderCulling | AUTO |
pickCulling | AUTO |
fastEditing | DISABLE |
SoGLRenderAction, SoGetPrimitiveCountAction Uses value calculation to influence traversal. All other actions use standard SoSeparator traversal.