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SoMaterial(3) Library Functions Manual SoMaterial(3)

NAME

SoMaterial - The SoMaterial class is a node type for setting up material values for scene geometry.

SYNOPSIS

#include <Inventor/nodes/SoMaterial.h>

Inherits SoNode.

Public Member Functions


virtual SoType getTypeId (void) const
SoMaterial (void)
virtual void doAction (SoAction *action)
virtual void GLRender (SoGLRenderAction *action)
virtual void callback (SoCallbackAction *action)

Public Member Functions inherited from SoNode
void setOverride (const SbBool state)
SbBool isOverride (void) const
void setNodeType (const NodeType type)
NodeType getNodeType (void) const
virtual SoNode * copy (SbBool copyconnections=FALSE) const
virtual SbBool affectsState (void) const
virtual void GLRenderBelowPath (SoGLRenderAction *action)
virtual void GLRenderInPath (SoGLRenderAction *action)
virtual void GLRenderOffPath (SoGLRenderAction *action)
virtual void getBoundingBox (SoGetBoundingBoxAction *action)
virtual void getMatrix (SoGetMatrixAction *action)
virtual void handleEvent (SoHandleEventAction *action)
virtual void pick (SoPickAction *action)
virtual void rayPick (SoRayPickAction *action)
virtual void search (SoSearchAction *action)
virtual void write (SoWriteAction *action)
virtual void audioRender (SoAudioRenderAction *action)
virtual void getPrimitiveCount (SoGetPrimitiveCountAction *action)
virtual void grabEventsSetup (void)
virtual void grabEventsCleanup (void)
virtual void startNotify (void)
uint32_t getNodeId (void) const
virtual SoChildList * getChildren (void) const
virtual void writeInstance (SoOutput *out)
virtual SoNode * addToCopyDict (void) const
virtual void copyContents (const SoFieldContainer *from, SbBool copyconnections)
virtual SoFieldContainer * copyThroughConnection (void) const

Public Member Functions inherited from SoFieldContainer
void setToDefaults (void)
SbBool hasDefaultValues (void) const
SbBool fieldsAreEqual (const SoFieldContainer *container) const
void copyFieldValues (const SoFieldContainer *container, SbBool copyconnections=FALSE)
SbBool set (const char *const fielddata)
void get (SbString &fielddata)
virtual int getFields (SoFieldList &l) const
virtual int getAllFields (SoFieldList &l) const
virtual SoField * getField (const SbName &name) const
virtual SoField * getEventIn (const SbName &name) const
virtual SoField * getEventOut (const SbName &name) const
SbBool getFieldName (const SoField *const field, SbName &name) const
SbBool enableNotify (const SbBool flag)
SbBool isNotifyEnabled (void) const
SbBool set (const char *fielddata, SoInput *input)
void get (SbString &fielddata, SoOutput *out)
virtual SbBool validateNewFieldValue (SoField *field, void *newval)
virtual void addWriteReference (SoOutput *out, SbBool isfromfield=FALSE)
SbBool getIsBuiltIn (void) const
virtual void getFieldsMemorySize (size_t &managed, size_t &unmanaged) const
void setUserData (void *userdata) const
void * getUserData (void) const

Public Member Functions inherited from SoBase
void ref (void) const
void unref (void) const
void unrefNoDelete (void) const
int32_t getRefCount (void) const
void touch (void)
SbBool isOfType (SoType type) const
virtual SbName getName (void) const
virtual void setName (const SbName &newname)
void addAuditor (void *const auditor, const SoNotRec::Type type)
void removeAuditor (void *const auditor, const SoNotRec::Type type)
const SoAuditorList & getAuditors (void) const
SbBool shouldWrite (void)
void assertAlive (void) const

Static Public Member Functions


static SoType getClassTypeId (void)
static void initClass (void)

Static Public Member Functions inherited from SoNode
static uint32_t getCompatibilityTypes (const SoType &nodetype)
static SoType getClassTypeId (void)
static SoNode * getByName (const SbName &name)
static int getByName (const SbName &name, SoNodeList &l)
static void initClass (void)
static void initClasses (void)
static uint32_t getNextNodeId (void)
static int getActionMethodIndex (const SoType type)
static void getBoundingBoxS (SoAction *action, SoNode *node)
static void GLRenderS (SoAction *action, SoNode *node)
static void callbackS (SoAction *action, SoNode *node)
static void getMatrixS (SoAction *action, SoNode *node)
static void handleEventS (SoAction *action, SoNode *node)
static void pickS (SoAction *action, SoNode *node)
static void rayPickS (SoAction *action, SoNode *node)
static void searchS (SoAction *action, SoNode *node)
static void writeS (SoAction *action, SoNode *node)
static void audioRenderS (SoAction *action, SoNode *node)
static void getPrimitiveCountS (SoAction *action, SoNode *node)

Static Public Member Functions inherited from SoFieldContainer
static void initClass (void)
static SoType getClassTypeId (void)
static void cleanupClass (void)
static void initCopyDict (void)
static void addCopy (const SoFieldContainer *orig, const SoFieldContainer *copy)
static SoFieldContainer * checkCopy (const SoFieldContainer *orig)
static SoFieldContainer * findCopy (const SoFieldContainer *orig, const SbBool copyconnections)
static void copyDone (void)

Static Public Member Functions inherited from SoBase
static void initClass (void)
static SoType getClassTypeId (void)
static void addName (SoBase *const base, const char *const name)
static void removeName (SoBase *const base, const char *const name)
static void incrementCurrentWriteCounter (void)
static void decrementCurrentWriteCounter (void)
static SoBase * getNamedBase (const SbName &name, SoType type)
static int getNamedBases (const SbName &name, SoBaseList &baselist, SoType type)
static SbBool read (SoInput *input, SoBase *&base, SoType expectedtype)
static void setInstancePrefix (const SbString &c)
static void setTraceRefs (SbBool trace)
static SbBool getTraceRefs (void)
static SbBool connectRoute (SoInput *input, const SbName &fromnodename, const SbName &fromfieldname, const SbName &tonodename, const SbName &tofieldname)
static SbBool readRoute (SoInput *input)

Public Attributes


SoMFColor ambientColor
SoMFColor diffuseColor
SoMFColor specularColor
SoMFColor emissiveColor
SoMFFloat shininess
SoMFFloat transparency

Protected Member Functions


virtual const SoFieldData * getFieldData (void) const
virtual ~SoMaterial ()
virtual void notify (SoNotList *list)

Protected Member Functions inherited from SoNode
SoNode (void)
virtual ~SoNode ()
virtual SbBool readInstance (SoInput *in, unsigned short flags)

Protected Member Functions inherited from SoFieldContainer
SoFieldContainer (void)
virtual ~SoFieldContainer ()

Protected Member Functions inherited from SoBase
SoBase (void)
virtual ~SoBase ()
virtual void destroy (void)
SbBool hasMultipleWriteRefs (void) const
SbBool writeHeader (SoOutput *out, SbBool isgroup, SbBool isengine) const
void writeFooter (SoOutput *out) const
virtual const char * getFileFormatName (void) const

Static Protected Member Functions


static const SoFieldData ** getFieldDataPtr (void)

Static Protected Member Functions inherited from SoNode
static const SoFieldData ** getFieldDataPtr (void)
static void setNextActionMethodIndex (int index)
static int getNextActionMethodIndex (void)
static void incNextActionMethodIndex (void)
static void setCompatibilityTypes (const SoType &nodetype, const uint32_t bitmask)

Static Protected Member Functions inherited from SoBase
static uint32_t getCurrentWriteCounter (void)
static void staticDataLock (void)
static void staticDataUnlock (void)

Additional Inherited Members

Public Types inherited from SoNode
enum NodeType { INVENTOR = 0x0000, VRML1 = 0x0001, VRML2 = 0x0002, INVENTOR_1 = 0x0004, INVENTOR_2_0 = 0x0008, INVENTOR_2_1 = 0x0010, INVENTOR_2_5 = 0x0020, INVENTOR_2_6 = 0x0040, COIN_1_0 = 0x0080, COIN_2_0 = 0x0100, EXTENSION = 0x0200, COIN_2_2 = 0x0400, COIN_2_3 = 0x0800, COIN_2_4 = 0x1000, INVENTOR_5_0 = 0x2000, COIN_2_5 = 0x4000, COIN_3_0 = 0x8000, INVENTOR_6_0 = 0x10000 }

Protected Types inherited from SoBase
enum BaseFlags { IS_ENGINE = 0x01, IS_GROUP = 0x02 }

Protected Attributes inherited from SoNode
uint32_t uniqueId

Protected Attributes inherited from SoFieldContainer
SbBool isBuiltIn

Static Protected Attributes inherited from SoNode
static uint32_t nextUniqueId = 1
static int nextActionMethodIndex = 0

Detailed Description

The SoMaterial class is a node type for setting up material values for scene geometry.

After traversing an SoMaterial node, subsequent shape nodes with geometry in the scene graph will use values from the material "pool" of the traversal state set up from nodes of this type.

For detailed information on the various components, see the OpenGL color model, presented in the chapter "Colors and Coloring" (chapter 2.13 in the OpenGL 1.4 specification).

Note that values from a material node will replace the previous values from the traversal state, they will not accumulate. That's the case even when e.g. material changes are implicit in an iv-file, as illustrated by the following example:

Also note that support for multiple values in ambientColor, emissiveColor, specularColor and shininess was obsoleted in Open Inventor 2.1. The reason for this design change was performance driven, since it's relatively slow to change the OpenGL material properties. Changing the diffuse color value is fast though, so it's still possible to have multiple diffuseColor and transparency values.

#Inventor V2.1 ascii
Material { ambientColor 1 0 0 }
Cone { }
Translation { translation 5 0 0 }
Material { }
Sphere { }

(The SoSphere will not "inherit" the SoMaterial::ambientColor from the first SoMaterial node, even though it is not explicitly set in the second material node. The default value of SoMaterial::ambientColor will be used.)

Note that nodes imported as part of a VRML V1.0 file has a special case, where the fields SoMaterial::ambientColor, SoMaterial::diffuseColor and SoMaterial::specularColor contains zero values, and SoMaterial::emissiveColor contains one or more values. The values in SoMaterial::emissiveColor should then be treated as precalculated lighting, and the other fields should be ignored.

You can detect this case by checking the values of the material elements when the scene graph is traversed using an SoCallbackAction. SoDiffuseColorElement, SoAmbientColorElement, and SoSpecularColorElement will contain one value with a completely black color (0.0f, 0.0f, 0.0f), SoShininessElement will contain one value of 0.0f, and SoEmissiveColorElement will contain one or more values. It is done like this to make rendering work correctly on systems that do not test for this specific case.

You should only check for this case when you're traversing a VRML V1.0 file scene graph, of course. See SoNode::getNodeType() for information about how nodes can be tested for whether or not they have been imported or otherwise set up as of VRML1 type versus Inventor type.

When the scene graph is rendered using an SoGLRenderAction, the elements will be set differently to optimize rendering. The SoDiffuseColorElement will be set to the values in SoMaterial::emissiveColor, and the light model will be set to SoLightModel::BASE_COLOR.

The SoMaterial::transparency values will always be treated normally.

Here is a very simple usage example:

#Inventor V2.1 ascii
Separator {


   Coordinate3 {


      point [ 0 0 0, 1 0 0, 1 1 0 ]


   }


   Material {


      diffuseColor [ 1 0 0, 1 1 0, 0 0 1 ]


   }


   MaterialBinding {


      value PER_VERTEX


   }


   IndexedFaceSet {


      coordIndex [ 0, 1, 2, -1 ]


   }
}

FILE FORMAT/DEFAULTS:

Material {


    ambientColor 0.2 0.2 0.2


    diffuseColor 0.8 0.8 0.8


    specularColor 0 0 0


    emissiveColor 0 0 0


    shininess 0.2


    transparency 0
}

See also

SoMaterialBinding, SoBaseColor, SoPackedColor

Constructor & Destructor Documentation

SoMaterial::SoMaterial (void )

Constructor.

SoMaterial::~SoMaterial () [protected], [virtual]

Destructor.

Member Function Documentation

SoType SoMaterial::getTypeId (void ) const [virtual]

Returns the type identification of an object derived from a class inheriting SoBase. This is used for run-time type checking and "downward" casting.

Usage example:

void foo(SoNode * node)
{


  if (node->getTypeId() == SoFile::getClassTypeId()) {


    SoFile * filenode = (SoFile *)node;  // safe downward cast, knows the type


  }
}

For application programmers wanting to extend the library with new nodes, engines, nodekits, draggers or others: this method needs to be overridden in all subclasses. This is typically done as part of setting up the full type system for extension classes, which is usually accomplished by using the pre-defined macros available through for instance Inventor/nodes/SoSubNode.h (SO_NODE_INIT_CLASS and SO_NODE_CONSTRUCTOR for node classes), Inventor/engines/SoSubEngine.h (for engine classes) and so on.

For more information on writing Coin extensions, see the class documentation of the toplevel superclasses for the various class groups.

Implements SoBase.

const SoFieldData * SoMaterial::getFieldData (void ) const [protected], [virtual]

Returns a pointer to the class-wide field data storage object for this instance. If no fields are present, returns NULL.

Reimplemented from SoFieldContainer.

void SoMaterial::doAction (SoAction * action) [virtual]

This function performs the typical operation of a node for any action.

Reimplemented from SoNode.

void SoMaterial::GLRender (SoGLRenderAction * action) [virtual]

Action method for the SoGLRenderAction.

This is called during rendering traversals. Nodes influencing the rendering state in any way or who wants to throw geometry primitives at OpenGL overrides this method.

Reimplemented from SoNode.

void SoMaterial::callback (SoCallbackAction * action) [virtual]

Action method for SoCallbackAction.

Simply updates the state according to how the node behaves for the render action, so the application programmer can use the SoCallbackAction for extracting information about the scene graph.

Reimplemented from SoNode.

void SoMaterial::notify (SoNotList * l) [protected], [virtual]

Notifies all auditors for this instance when changes are made.

Reimplemented from SoNode.

Member Data Documentation

SoMFColor SoMaterial::ambientColor

Ambient material part color values. Will by default contain a single color value of [0.2, 0.2, 0.2] (ie dark gray).

The ambient part of the material is not influenced by any lightsources, and should be thought of conceptually as the constant, but small contribution of light to a scene "seeping in" from everywhere.

(Think of the ambient contribution in the context that there's always photons fizzing around everywhere -- even in a black, lightsource-less room, for instance).

Only the first value in this field will be used. All other values will be ignored.

See also

SoEnvironment::ambientIntensity

SoMFColor SoMaterial::diffuseColor

Diffuse material part color values. This field is by default initialized to contain a single color value of [0.8, 0.8, 0.8] (light gray).

The diffuse part is combined with the light emitted from the scene's light sources.

Traditional Open Inventor uses the same override bit for both diffuse color and transparency. To get around this problem if you need to override one without the other, set the environment variable "COIN_SEPARATE_DIFFUSE_TRANSPARENCY_OVERRIDE". This is a Coin extension, and will not work on the other Open Inventor implementations.

SoMFColor SoMaterial::specularColor

Specular material part color values. Defaults to a single color value of [0, 0, 0] (black).

Only the first value in this field will be used. All other values will be ignored.

SoMFColor SoMaterial::emissiveColor

The color of the light "emitted" by the subsequent geometry, independent of lighting / shading.

Defaults to contain a single color value of [0, 0, 0] (black, ie no contribution).

Only the first value in this field will be used. All other values will be ignored.

SoMFFloat SoMaterial::shininess

Shininess values. Decides how the light from light sources are distributed across the geometry surfaces. Valid range is from 0.0 (which gives a dim appearance), to 1.0 (glossy-looking surfaces).

Defaults to contain a single value of 0.2.

Only the first value in this field will be used. All other values will be ignored.

SoMFFloat SoMaterial::transparency

Transparency values. Valid range is from 0.0 (completely opaque, which is the default) to 1.0 (completely transparent, i.e. invisible).

Defaults to contain a single value of 0.0.

Traditional Open Inventor uses the same override bit for both transparency and diffuse color. To get around this problem if you need to override one without the other, set the environment variable "COIN_SEPARATE_DIFFUSE_TRANSPARENCY_OVERRIDE". This is a Coin extension, and will not work on the other Open Inventor implementations.

Author

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