| SoLevelOfDetail Class |
Level-of-detail switching group node.
Inheritance HierarchyOIV.InventorSoNetBase
OIV.InventorSoDisposable
OIV.Inventor.MiscSoBase
OIV.Inventor.FieldsSoFieldContainer
OIV.Inventor.NodesSoNode
OIV.Inventor.NodesSoGroup
OIV.Inventor.NodesSoLevelOfDetail
Namespace: OIV.Inventor.Nodes
Assembly: OIV.Inventor (in OIV.Inventor.dll) Version: 2023.1.3.0 (2023.1.3)
SyntaxThe SoLevelOfDetail type exposes the following members.
Constructors| Name | Description | |
|---|---|---|
 | SoLevelOfDetail | Creates a level-of-detail node with default settings. |
| SoLevelOfDetail(Int32) | Constructor that takes approximate number of children. |
Methods| Name | Description | |
|---|---|---|
| AddChild | Adds a child as last one in group. |
| AffectsState | Returns true if a node has an effect on the state during traversal. |
| Callback | (Overrides SoGroupCallback(SoCallbackAction).) |
| 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 SoNode.) |
| DoAction | (Overrides SoGroupDoAction(SoAction).) |
| EnableNotify | Notification at this Field Container is enabled (if flag == true) or disabled (if flag == false). |
| Equals | Determines whether the specified Object is equal to the current Object. (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 | (Inherited from SoGroup.) |
| 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 SoGroup.) |
| GetName | Returns the name of an instance. |
| GetNumChildren | Returns number of children. |
| GetPrimitiveCount | (Inherited from SoGroup.) |
| GetRenderEngineMode | Returns the supported Render engine mode. |
| GetRenderUnitID | (Inherited from SoNode.) |
| GetStringName | (Inherited from SoBase.) |
| GetType | Gets the Type of the current instance. (Inherited from Object.) |
| GLRender | (Overrides SoGroupGLRender(SoGLRenderAction).) |
| GLRenderBelowPath | (Inherited from SoNode.) |
| GLRenderInPath | (Inherited from SoNode.) |
| GLRenderOffPath | (Inherited from SoNode.) |
| GrabEventsCleanup | (Inherited from SoNode.) |
| GrabEventsSetup | (Inherited from SoNode.) |
| HandleEvent | (Inherited from SoGroup.) |
| 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 | (Inherited from SoGroup.) |
| RayPick | (Overrides SoNodeRayPick(SoRayPickAction).) |
| RemoveAllChildren | Removes all children from group. |
| RemoveChild(Int32) | Removes child with given index from group. |
| RemoveChild(SoNode) | Removes first instance of given child from group. |
| 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 SoGroup.) |
| 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.) |
Properties| Name | Description | |
|---|---|---|
 | boundingBoxIgnoring | Whether to ignore this node during bounding box traversal. |
| IsDisposable | ISafeDisposable interface implementation.
(Inherited from SoDisposable.) |
| screenArea | Areas to use for comparison. |
| UserData |
Gets or sets the user data to be contained by the field container.
(Inherited from SoFieldContainer.) |
RemarksThe children of this node typically represent the same object or objects at varying levels of detail, from highest detail to lowest. The size of the objects when projected into the viewport is used to determine which version to use (i.e., which child to traverse).
The size is computed as the area of the screen rectangle enclosing the projection of the 3D bounding box that encloses all of the children. When rendering, this size is compared to the values in the OIV.Inventor.Nodes.SoLevelOfDetail.screenArea field. If the size is greater than the first value, child 0 is traversed. If it is smaller than the first, but greater than the second, child 1 is traversed, and so on. If there are fewer children than are required by this rule, the last child is traversed. The OIV.Inventor.Nodes.SoLevelOfDetail.screenArea field contains just 0 by default, so the first child is always traversed.
The size calculation takes the current complexity into account. If the complexity is 0 or is of type BOUNDING_BOX, the last child is always traversed. If the complexity is less than .5, the computed size is scaled down appropriately to use (possibly) a less detailed representation. If the complexity is greater than .5, the size is scaled up. At complexity 1, the first child is always used.
Note that the OIV.Inventor.Nodes.SoLOD node is similar to OIV.Inventor.Nodes.SoLevelOfDetail, except the switching between levels in the OIV.Inventor.Nodes.SoLOD node is based on distance from the camera, which is faster than using screen area.
FILE FORMAT/DEFAULT
LevelOfDetail {
| screenArea | 0 |
ACTION BEHAVIOR
OIV.Inventor.Actions.SoGLRenderAction, OIV.Inventor.Actions.SoRayPickAction, OIV.Inventor.Actions.SoCallbackAction Only the child with the appropriate level of detail is traversed.
OIV.Inventor.Actions.SoGetBoundingBoxAction The box that encloses all children is computed. (This is the box that is needed to compute the projected size.)
Other actions
All implemented as for OIV.Inventor.Nodes.SoGroup.
See Also