Open CASCADE Technology
7.7.0
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The algorithm is based on the General Fuse algorithm (GFA). The result of GFA is all split parts of the Arguments. More...
#include <BOPAlgo_CellsBuilder.hxx>
Public Member Functions | |
BOPAlgo_CellsBuilder () | |
BOPAlgo_CellsBuilder (const Handle< NCollection_BaseAllocator > &theAllocator) | |
virtual | ~BOPAlgo_CellsBuilder () |
virtual void | Clear () override |
Redefined method Clear - clears the contents. More... | |
void | AddToResult (const TopTools_ListOfShape &theLSToTake, const TopTools_ListOfShape &theLSToAvoid, const Standard_Integer theMaterial=0, const Standard_Boolean theUpdate=Standard_False) |
Adding the parts to result. The parts are defined by two lists of shapes: <theLSToTake> defines the arguments which parts should be taken into result; <theLSToAvoid> defines the arguments which parts should not be taken into result; To be taken into result the part must be IN for all shapes from the list <theLSToTake> and must be OUT of all shapes from the list <theLSToAvoid>. More... | |
void | AddAllToResult (const Standard_Integer theMaterial=0, const Standard_Boolean theUpdate=Standard_False) |
Add all split parts to result. <theMaterial> defines the removal of internal boundaries; <theUpdate> parameter defines whether to remove boundaries now or not. More... | |
void | RemoveFromResult (const TopTools_ListOfShape &theLSToTake, const TopTools_ListOfShape &theLSToAvoid) |
Removing the parts from result. The parts are defined by two lists of shapes: <theLSToTake> defines the arguments which parts should be removed from result; <theLSToAvoid> defines the arguments which parts should not be removed from result. To be removed from the result the part must be IN for all shapes from the list <theLSToTake> and must be OUT of all shapes from the list <theLSToAvoid>. More... | |
void | RemoveAllFromResult () |
Remove all parts from result. More... | |
void | RemoveInternalBoundaries () |
Removes internal boundaries between cells with the same material. If the result contains the cells with same material but of different dimension the removal of internal boundaries between these cells will not be performed. In case of some errors during the removal the method will set the appropriate warning status - use GetReport() to access them. More... | |
const TopoDS_Shape & | GetAllParts () const |
Get all split parts. More... | |
void | MakeContainers () |
Makes the Containers of proper type from the parts added to result. More... | |
Public Member Functions inherited from BOPAlgo_Builder | |
BOPAlgo_Builder () | |
Empty constructor. More... | |
virtual | ~BOPAlgo_Builder () |
BOPAlgo_Builder (const Handle< NCollection_BaseAllocator > &theAllocator) | |
BOPAlgo_PPaveFiller | PPaveFiller () |
Returns the PaveFiller, algorithm for sub-shapes intersection. More... | |
BOPDS_PDS | PDS () |
Returns the Data Structure, holder of intersection information. More... | |
Handle< IntTools_Context > | Context () const |
Returns the Context, tool for cashing heavy algorithms. More... | |
virtual void | AddArgument (const TopoDS_Shape &theShape) |
Adds the argument to the operation. More... | |
virtual void | SetArguments (const TopTools_ListOfShape &theLS) |
Sets the list of arguments for the operation. More... | |
const TopTools_ListOfShape & | Arguments () const |
Returns the list of arguments. More... | |
void | SetNonDestructive (const Standard_Boolean theFlag) |
Sets the flag that defines the mode of treatment. In non-destructive mode the argument shapes are not modified. Instead a copy of a sub-shape is created in the result if it is needed to be updated. This flag is taken into account if internal PaveFiller is used only. In the case of calling PerformWithFiller the corresponding flag of that PaveFiller is in force. More... | |
Standard_Boolean | NonDestructive () const |
Returns the flag that defines the mode of treatment. In non-destructive mode the argument shapes are not modified. Instead a copy of a sub-shape is created in the result if it is needed to be updated. More... | |
void | SetGlue (const BOPAlgo_GlueEnum theGlue) |
Sets the glue option for the algorithm. More... | |
BOPAlgo_GlueEnum | Glue () const |
Returns the glue option of the algorithm. More... | |
void | SetCheckInverted (const Standard_Boolean theCheck) |
Enables/Disables the check of the input solids for inverted status. More... | |
Standard_Boolean | CheckInverted () const |
Returns the flag defining whether the check for input solids on inverted status should be performed or not. More... | |
virtual void | Perform (const Message_ProgressRange &theRange=Message_ProgressRange()) override |
Performs the operation. The intersection will be performed also. More... | |
virtual void | PerformWithFiller (const BOPAlgo_PaveFiller &theFiller, const Message_ProgressRange &theRange=Message_ProgressRange()) |
Performs the operation with the prepared filler. The intersection will not be performed in this case. More... | |
virtual void | BuildBOP (const TopTools_ListOfShape &theObjects, const TopAbs_State theObjState, const TopTools_ListOfShape &theTools, const TopAbs_State theToolsState, const Message_ProgressRange &theRange, Handle< Message_Report > theReport=NULL) |
Builds the result shape according to the given states for the objects and tools. These states can be unambiguously converted into the Boolean operation type. Thus, it performs the Boolean operation on the given groups of shapes. More... | |
void | BuildBOP (const TopTools_ListOfShape &theObjects, const TopTools_ListOfShape &theTools, const BOPAlgo_Operation theOperation, const Message_ProgressRange &theRange, Handle< Message_Report > theReport=NULL) |
Builds the result of Boolean operation of given type basing on the result of Builder operation (GF or any other). More... | |
const TopTools_DataMapOfShapeListOfShape & | Images () const |
Returns the map of images. More... | |
const TopTools_DataMapOfShapeListOfShape & | Origins () const |
Returns the map of origins. More... | |
const TopTools_DataMapOfShapeShape & | ShapesSD () const |
Returns the map of Same Domain (SD) shapes - coinciding shapes from different arguments. More... | |
Public Member Functions inherited from BOPAlgo_BuilderShape | |
const TopoDS_Shape & | Shape () const |
Returns the result of algorithm. More... | |
const TopTools_ListOfShape & | Modified (const TopoDS_Shape &theS) |
Returns the list of shapes Modified from the shape theS. More... | |
const TopTools_ListOfShape & | Generated (const TopoDS_Shape &theS) |
Returns the list of shapes Generated from the shape theS. More... | |
Standard_Boolean | IsDeleted (const TopoDS_Shape &theS) |
Returns true if the shape theS has been deleted. In this case the shape will have no Modified elements, but can have Generated elements. More... | |
Standard_Boolean | HasModified () const |
Returns true if any of the input shapes has been modified during operation. More... | |
Standard_Boolean | HasGenerated () const |
Returns true if any of the input shapes has generated shapes during operation. More... | |
Standard_Boolean | HasDeleted () const |
Returns true if any of the input shapes has been deleted during operation. More... | |
Handle< BRepTools_History > | History () |
History Tool. More... | |
void | SetToFillHistory (const Standard_Boolean theHistFlag) |
Allows disabling the history collection. More... | |
Standard_Boolean | HasHistory () const |
Returns flag of history availability. More... | |
Public Member Functions inherited from BOPAlgo_Options | |
BOPAlgo_Options () | |
Empty constructor. More... | |
BOPAlgo_Options (const Handle< NCollection_BaseAllocator > &theAllocator) | |
Constructor with allocator. More... | |
virtual | ~BOPAlgo_Options () |
Destructor. More... | |
const Handle< NCollection_BaseAllocator > & | Allocator () const |
Returns allocator. More... | |
void | AddError (const Handle< Message_Alert > &theAlert) |
Adds the alert as error (fail) More... | |
void | AddWarning (const Handle< Message_Alert > &theAlert) |
Adds the alert as warning. More... | |
Standard_Boolean | HasErrors () const |
Returns true if algorithm has failed. More... | |
Standard_Boolean | HasError (const Handle< Standard_Type > &theType) const |
Returns true if algorithm has generated error of specified type. More... | |
Standard_Boolean | HasWarnings () const |
Returns true if algorithm has generated some warning alerts. More... | |
Standard_Boolean | HasWarning (const Handle< Standard_Type > &theType) const |
Returns true if algorithm has generated warning of specified type. More... | |
const Handle< Message_Report > & | GetReport () const |
Returns report collecting all errors and warnings. More... | |
void | DumpErrors (Standard_OStream &theOS) const |
Dumps the error status into the given stream. More... | |
void | DumpWarnings (Standard_OStream &theOS) const |
Dumps the warning statuses into the given stream. More... | |
void | ClearWarnings () |
Clears the warnings of the algorithm. More... | |
void | SetFuzzyValue (const Standard_Real theFuzz) |
Sets the additional tolerance. More... | |
Standard_Real | FuzzyValue () const |
Returns the additional tolerance. More... | |
void | SetUseOBB (const Standard_Boolean theUseOBB) |
Enables/Disables the usage of OBB. More... | |
Standard_Boolean | UseOBB () const |
Returns the flag defining usage of OBB. More... | |
void | SetRunParallel (const Standard_Boolean theFlag) |
Set the flag of parallel processing if <theFlag> is true the parallel processing is switched on if <theFlag> is false the parallel processing is switched off. More... | |
Standard_Boolean | RunParallel () const |
Returns the flag of parallel processing. More... | |
Protected Member Functions | |
virtual const TopTools_ListOfShape * | LocModified (const TopoDS_Shape &theS) override |
Prepare information for history support taking into account local modification map of unified elements - myMapModified. More... | |
virtual void | PerformInternal1 (const BOPAlgo_PaveFiller &thePF, const Message_ProgressRange &theRange) override |
Redefined method PerformInternal1 - makes all split parts, nullifies the result <myShape>, and index all parts. More... | |
void | IndexParts () |
Indexes the parts for quick access to the arguments. More... | |
void | FindParts (const TopTools_ListOfShape &theLSToTake, const TopTools_ListOfShape &theLSToAvoid, TopTools_ListOfShape &theParts) |
Looking for the parts defined by two lists. More... | |
Standard_Boolean | RemoveInternals (const TopTools_ListOfShape &theLS, TopTools_ListOfShape &theLSNew, const TopTools_MapOfShape &theMapKeepBnd=TopTools_MapOfShape()) |
Removes internal boundaries between cells with the same material. Returns TRUE if any internal boundaries have been removed. More... | |
Protected Member Functions inherited from BOPAlgo_Builder | |
void | PrepareHistory (const Message_ProgressRange &theRange) |
Prepare information for history support. More... | |
virtual const TopTools_ListOfShape & | LocGenerated (const TopoDS_Shape &theS) |
Returns the list of shapes generated from the shape theS. Similarly to LocModified must be redefined for specific operations, obtaining Generated elements differently. More... | |
virtual void | PerformInternal (const BOPAlgo_PaveFiller &thePF, const Message_ProgressRange &theRange) |
Performs the building of the result. The method calls the PerformInternal1() method surrounded by a try-catch block. More... | |
virtual void | BuildResult (const TopAbs_ShapeEnum theType) |
Builds the result of operation. The method is called for each of the arguments type and adds into the result the splits of the arguments of that type. More... | |
virtual void | CheckData () override |
Checks the input data. More... | |
void | CheckFiller () |
Checks if the intersection algorithm has Errors/Warnings. More... | |
virtual void | Prepare () |
Prepares the result shape by making it empty compound. More... | |
void | FillImagesVertices (const Message_ProgressRange &theRange) |
Fills the images of vertices. More... | |
void | FillImagesEdges (const Message_ProgressRange &theRange) |
Fills the images of edges. More... | |
void | FillImagesContainers (const TopAbs_ShapeEnum theType, const Message_ProgressRange &theRange) |
Fills the images of containers (WIRES/SHELLS/COMPSOLID). More... | |
void | FillImagesContainer (const TopoDS_Shape &theS, const TopAbs_ShapeEnum theType) |
Builds the image of the given container using the splits of its sub-shapes. More... | |
void | FillImagesFaces (const Message_ProgressRange &theRange) |
Fills the images of faces. The method consists of three steps: More... | |
virtual void | BuildSplitFaces (const Message_ProgressRange &theRange) |
Builds the splits of faces using the information from the intersection stage stored in Data Structure. More... | |
void | FillSameDomainFaces (const Message_ProgressRange &theRange) |
Looks for the same domain faces among the splits of the faces. Updates the map of images with SD faces. More... | |
void | FillInternalVertices (const Message_ProgressRange &theRange) |
Classifies the alone vertices on faces relatively its splits and adds them as INTERNAL into the splits. More... | |
void | FillImagesSolids (const Message_ProgressRange &theRange) |
Fills the images of solids. The method consists of four steps: More... | |
void | BuildDraftSolid (const TopoDS_Shape &theSolid, TopoDS_Shape &theDraftSolid, TopTools_ListOfShape &theLIF) |
Builds the draft solid by rebuilding the shells of the solid with the splits of faces. More... | |
virtual void | FillIn3DParts (TopTools_DataMapOfShapeShape &theDraftSolids, const Message_ProgressRange &theRange) |
Finds faces located inside each solid. More... | |
void | BuildSplitSolids (TopTools_DataMapOfShapeShape &theDraftSolids, const Message_ProgressRange &theRange) |
Builds the splits of the solids using their draft versions and faces located inside. More... | |
void | FillInternalShapes (const Message_ProgressRange &theRange) |
Classifies the vertices and edges from the arguments relatively splits of solids and makes them INTERNAL for solids. More... | |
void | FillImagesCompounds (const Message_ProgressRange &theRange) |
Fills the images of compounds. More... | |
void | FillImagesCompound (const TopoDS_Shape &theS, TopTools_MapOfShape &theMF) |
Builds the image of the given compound. More... | |
virtual void | PostTreat (const Message_ProgressRange &theRange) |
Post treatment of the result of the operation. The method checks validity of the sub-shapes of the result and updates the tolerances to make them valid. More... | |
NbShapes | getNbShapes () const |
Compute number of shapes of certain type participating in operation. More... | |
void | fillPIConstants (const Standard_Real theWhole, BOPAlgo_PISteps &theSteps) const override |
Filling steps for constant operations. More... | |
void | fillPISteps (BOPAlgo_PISteps &theSteps) const override |
Filling steps for all other operations. More... | |
Protected Member Functions inherited from BOPAlgo_BuilderShape | |
BOPAlgo_BuilderShape () | |
Empty constructor. More... | |
BOPAlgo_BuilderShape (const Handle< NCollection_BaseAllocator > &theAllocator) | |
Constructor with allocator. More... | |
Protected Member Functions inherited from BOPAlgo_Algo | |
BOPAlgo_Algo () | |
Default constructor. More... | |
virtual | ~BOPAlgo_Algo () |
BOPAlgo_Algo (const Handle< NCollection_BaseAllocator > &theAllocator) | |
virtual void | CheckResult () |
Checks the obtained result. More... | |
void | analyzeProgress (const Standard_Real theWhole, BOPAlgo_PISteps &theSteps) const |
Analyze progress steps of the whole operation. More... | |
Protected Member Functions inherited from BOPAlgo_Options | |
Standard_Boolean | UserBreak (const Message_ProgressScope &thePS) |
Adds error to the report if the break signal was caught. Returns true in this case, false otherwise. More... | |
Protected Attributes | |
TopoDS_Shape | myAllParts |
All split parts of the arguments. More... | |
TopTools_IndexedDataMapOfShapeListOfShape | myIndex |
Connection map from all splits parts to the argument shapes from which they were created. More... | |
TopTools_DataMapOfIntegerListOfShape | myMaterials |
Map of assigned materials (material -> list of shape) More... | |
TopTools_DataMapOfShapeInteger | myShapeMaterial |
Map of assigned materials (shape -> material) More... | |
TopTools_DataMapOfShapeShape | myMapModified |
Local modification map to track unification of the splits. More... | |
Protected Attributes inherited from BOPAlgo_Builder | |
TopTools_ListOfShape | myArguments |
Arguments of the operation. More... | |
TopTools_MapOfShape | myMapFence |
Fence map providing the uniqueness of the shapes in the list of arguments. More... | |
BOPAlgo_PPaveFiller | myPaveFiller |
Pave Filler - algorithm for sub-shapes intersection. More... | |
BOPDS_PDS | myDS |
Data Structure - holder of intersection information. More... | |
Handle< IntTools_Context > | myContext |
Context - tool for cashing heavy algorithms such as Projectors and Classifiers. More... | |
Standard_Integer | myEntryPoint |
EntryPoint - controls the deletion of the PaveFiller, which could live longer than the Builder. More... | |
TopTools_DataMapOfShapeListOfShape | myImages |
Images - map of Images of the sub-shapes of arguments. More... | |
TopTools_DataMapOfShapeShape | myShapesSD |
ShapesSD - map of SD Shapes. More... | |
TopTools_DataMapOfShapeListOfShape | myOrigins |
Origins - map of Origins, back map of Images. More... | |
TopTools_DataMapOfShapeListOfShape | myInParts |
InParts - map of own and acquired IN faces of the arguments solids. More... | |
Standard_Boolean | myNonDestructive |
Safe processing option allows avoiding modification of the input shapes. More... | |
BOPAlgo_GlueEnum | myGlue |
Gluing option allows speeding up the intersection of the input shapes. More... | |
Standard_Boolean | myCheckInverted |
Check inverted option allows disabling the check of input solids on inverted status. More... | |
Protected Attributes inherited from BOPAlgo_BuilderShape | |
TopoDS_Shape | myShape |
Result of the operation. More... | |
TopTools_ListOfShape | myHistShapes |
Storer for the history shapes. More... | |
TopTools_MapOfShape | myMapShape |
cached map of all arguments shapes More... | |
Standard_Boolean | myFillHistory |
Controls the history filling. More... | |
Handle< BRepTools_History > | myHistory |
History tool. More... | |
Protected Attributes inherited from BOPAlgo_Options | |
Handle< NCollection_BaseAllocator > | myAllocator |
Enables/Disables the usage of OBB. More... | |
Handle< Message_Report > | myReport |
Enables/Disables the usage of OBB. More... | |
Standard_Boolean | myRunParallel |
Enables/Disables the usage of OBB. More... | |
Standard_Real | myFuzzyValue |
Enables/Disables the usage of OBB. More... | |
Standard_Boolean | myUseOBB |
Enables/Disables the usage of OBB. More... | |
Additional Inherited Members | |
Static Public Member Functions inherited from BOPAlgo_Options | |
static Standard_Boolean | GetParallelMode () |
Gets the global parallel mode. More... | |
static void | SetParallelMode (const Standard_Boolean theNewMode) |
Sets the global parallel mode. More... | |
Protected Types inherited from BOPAlgo_Builder | |
enum | BOPAlgo_PIOperation { PIOperation_TreatVertices = 0, PIOperation_TreatEdges, PIOperation_TreatWires, PIOperation_TreatFaces, PIOperation_TreatShells, PIOperation_TreatSolids, PIOperation_TreatCompsolids, PIOperation_TreatCompounds, PIOperation_FillHistory, PIOperation_PostTreat, PIOperation_Last } |
List of operations to be supported by the Progress Indicator. More... | |
The algorithm is based on the General Fuse algorithm (GFA). The result of GFA is all split parts of the Arguments.
The purpose of this algorithm is to provide the result with the content of:
In other words the algorithm should provide the possibility for the user to add or remove any part to (from) result and remove any internal boundaries between parts.
All the requirements of GFA for the DATA are inherited in this algorithm. The arguments could be of any type (dimension) and should be valid in terms of BRepCheck_Analyzer and BOPAlgo_ArgumentAnalyzer.
Results:
The result of the algorithm is compound containing selected parts of the basic types (VERTEX, EDGE, FACE or SOLID). The default result is empty compound. It is possible to add any split part to the result by using the methods AddToRessult() and AddAllToResult(). It is also possible to remove any part from the result by using methods RemoveFromResult() and RemoveAllFromResult(). The method RemoveAllFromResult() is also suitable for clearing the result.
To remove Internal boundaries it is necessary to set the same material to the parts between which the boundaries should be removed and call the method RemoveInternalBoundaries(). The material should not be equal to 0, as this is default material value. The boundaries between parts with this value will not be removed. One part cannot be added with the different materials. It is also possible to remove the boundaries during combining the result. To do this it is necessary to set the material for parts (not equal to 0) and set the flag bUpdate to TRUE. For the arguments of the types FACE or EDGE it is recommended to remove the boundaries in the end when the result is completely built. It will help to avoid self-intersections in the result.
Note, that if the result contains the parts with same material but of different dimension the boundaries between such parts will not be removed. Currently, the removal of the internal boundaries between multi-dimensional shapes is not supported.
It is possible to create typed Containers from the parts added to result by using method MakeContainers(). The type of the containers will depend on the type of the arguments: WIRES for EEDGE, SHELLS for FACES and COMPSOLIDS for SOLIDS. The result will be compound containing containers. Adding of the parts to such result will not update containers. The result compound will contain the containers and new added parts (of basic type). Removing of the parts from such result may affect some containers if the parts that should be removed is in container. In this case this container will be rebuilt without that part.
History:
The algorithm supports history information for basic types of the shapes - VERTEX, EDGE, FACE. This information available through the methods IsDeleted() and Modified().
In DRAW Test Harness it is available through the same commands as for Boolean Operations (bmodified, bgenerated and bisdeleted).
The algorithm can return the following Error Statuses:
The algorithm can set the following Warning Statuses:
The Warning status can be checked with HasWarnings() method or printed with the DumpWarnings() method. If warnings are recorded, the result may be not as expected.
Examples:
BOPAlgo_CellsBuilder::BOPAlgo_CellsBuilder | ( | ) |
BOPAlgo_CellsBuilder::BOPAlgo_CellsBuilder | ( | const Handle< NCollection_BaseAllocator > & | theAllocator | ) |
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void BOPAlgo_CellsBuilder::AddAllToResult | ( | const Standard_Integer | theMaterial = 0 , |
const Standard_Boolean | theUpdate = Standard_False |
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) |
Add all split parts to result.
<theMaterial> defines the removal of internal boundaries;
<theUpdate> parameter defines whether to remove boundaries now or not.
void BOPAlgo_CellsBuilder::AddToResult | ( | const TopTools_ListOfShape & | theLSToTake, |
const TopTools_ListOfShape & | theLSToAvoid, | ||
const Standard_Integer | theMaterial = 0 , |
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const Standard_Boolean | theUpdate = Standard_False |
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) |
Adding the parts to result.
The parts are defined by two lists of shapes:
<theLSToTake> defines the arguments which parts should be taken into result;
<theLSToAvoid> defines the arguments which parts should not be taken into result;
To be taken into result the part must be IN for all shapes from the list <theLSToTake> and must be OUT of all shapes from the list <theLSToAvoid>.
To remove internal boundaries between any cells in the result <theMaterial> variable should be used. The boundaries between cells with the same material will be removed. Default value is 0.
Thus, to remove any boundary the value of this variable should not be equal to 0.
<theUpdate> parameter defines whether to remove boundaries now or not.
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overridevirtual |
Redefined method Clear - clears the contents.
Reimplemented from BOPAlgo_Builder.
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Looking for the parts defined by two lists.
const TopoDS_Shape& BOPAlgo_CellsBuilder::GetAllParts | ( | ) | const |
Get all split parts.
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Indexes the parts for quick access to the arguments.
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overrideprotectedvirtual |
Prepare information for history support taking into account local modification map of unified elements - myMapModified.
Reimplemented from BOPAlgo_Builder.
void BOPAlgo_CellsBuilder::MakeContainers | ( | ) |
Makes the Containers of proper type from the parts added to result.
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overrideprotectedvirtual |
Redefined method PerformInternal1 - makes all split parts, nullifies the result <myShape>, and index all parts.
Reimplemented from BOPAlgo_Builder.
void BOPAlgo_CellsBuilder::RemoveAllFromResult | ( | ) |
Remove all parts from result.
void BOPAlgo_CellsBuilder::RemoveFromResult | ( | const TopTools_ListOfShape & | theLSToTake, |
const TopTools_ListOfShape & | theLSToAvoid | ||
) |
Removing the parts from result.
The parts are defined by two lists of shapes:
<theLSToTake> defines the arguments which parts should be removed from result;
<theLSToAvoid> defines the arguments which parts should not be removed from result.
To be removed from the result the part must be IN for all shapes from the list <theLSToTake> and must be OUT of all shapes from the list <theLSToAvoid>.
void BOPAlgo_CellsBuilder::RemoveInternalBoundaries | ( | ) |
Removes internal boundaries between cells with the same material.
If the result contains the cells with same material but of different dimension the removal of internal boundaries between these cells will not be performed.
In case of some errors during the removal the method will set the appropriate warning status - use GetReport() to access them.
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Removes internal boundaries between cells with the same material.
Returns TRUE if any internal boundaries have been removed.
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All split parts of the arguments.
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Connection map from all splits parts to the argument shapes from which they were created.
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protected |
Local modification map to track unification of the splits.
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protected |
Map of assigned materials (material -> list of shape)
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protected |
Map of assigned materials (shape -> material)