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SoBumpMap Class Reference
[Nodes]

#include <Inventor/nodes/SoBumpMap.h>

Inheritance diagram for SoBumpMap:

SoNode SoFieldContainer SoBase List of all members.

Detailed Description

The SoBumpMap class is used to map a bump map onto subsequent shapes.

Currently only normal maps are supported. This means that the image must have three components, where the red image component equals the X normal component, green equals Y, and blue is Z. See http://www.paulsprojects.net/tutorials/simplebump/simplebump.html for a nice introduction about bump mapping and normal maps.

Grayscale images will be treated as height maps, and automatically converted to normal maps.

For bump mapping to work with extension nodes for Coin, the SoShape::generatePrimitives() method must be correctly implemented for the shape. This is needed since tangent space coordinates needs to be calculated for each vertex in the shape. All shape nodes which are a standard part of Coin meets this criteria.

Bump mapping in Coin requires OpenGL 1.3, or the following OpenGL extensions: GL_ARB_multitexture, GL_ARB_texture_cube_map, GL_ARB_texture_env_combine and GL_ARB_texture_env_dot3 (or the corresponding EXT extensions). If the run-time system doesn't meet these requirements, Coin will post a warning and the bump map will simply be ignored.

GL_ARB_vertex_program and GL_ARB_fragment_program is required to get specular lighting on the bumps. If these extensions are not available, the bumps will be rendered with diffuse lighting only.

Bump mapped objects will be rendered with multiple rendering passes. One extra pass per light source for diffuse only bumps, and two extra passes per light source for diffuse and specular bumps. You can turn off specular lighting on the bumps by setting specularColor to (0.0, 0.0, 0.0).

Since:
Coin 2.2


Public Types

enum  Wrap { REPEAT = SoTextureImageElement::REPEAT, CLAMP = SoTextureImageElement::CLAMP }

Public Member Functions

virtual SoType getTypeId (void) const
 SoBumpMap (void)
virtual void doAction (SoAction *action)
virtual void GLRender (SoGLRenderAction *action)
virtual void callback (SoCallbackAction *action)
virtual void rayPick (SoRayPickAction *action)

Static Public Member Functions

SoType getClassTypeId (void)
void initClass (void)
SbBool readImage (const SbString &fname, int &w, int &h, int &nc, unsigned char *&bytes)

Public Attributes

SoSFString filename
SoSFImage image
SoSFEnum wrapS
SoSFEnum wrapT

Protected Member Functions

virtual const SoFieldDatagetFieldData (void) const
virtual ~SoBumpMap ()
virtual SbBool readInstance (SoInput *in, unsigned short flags)
virtual void notify (SoNotList *list)

Static Protected Member Functions

const SoFieldData ** getFieldDataPtr (void)


Member Enumeration Documentation

enum SoBumpMap::Wrap
 

Enumeration of wrapping strategies which can be used when the bump map doesn't cover the full extent of the geometry.

Enumeration values:
REPEAT  Repeat bump map when coordinate is not between 0 and 1.
CLAMP  Clamp coordinate between 0 and 1.


Constructor & Destructor Documentation

SoBumpMap::SoBumpMap void   ) 
 

Constructor.

SoBumpMap::~SoBumpMap  )  [protected, virtual]
 

Destructor. Frees up internal resources used to store texture image data.


Member Function Documentation

SoType SoBumpMap::getClassTypeId void   )  [static]
 

This static method returns the SoType object associated with objects of this class.

Reimplemented from SoNode.

SoType SoBumpMap::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 } else if (node->getTypeId().isOfType(SoGroup::getClassTypeId())) { SoGroup * group = (SoGroup *)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 ** SoBumpMap::getFieldDataPtr void   )  [static, protected]
 

This API member is considered internal to the library, as it is not likely to be of interest to the application programmer.

Reimplemented from SoNode.

const SoFieldData * SoBumpMap::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 SoBumpMap::initClass void   )  [static]
 

Sets up initialization for data common to all instances of this class, like submitting necessary information to the Coin type system.

Reimplemented from SoNode.

void SoBumpMap::doAction SoAction action  )  [virtual]
 

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

Reimplemented from SoNode.

void SoBumpMap::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 SoBumpMap::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 SoBumpMap::rayPick SoRayPickAction action  )  [virtual]
 

Action method for SoRayPickAction.

Checks the ray specification of the action and tests for intersection with the data of the node.

Nodes influencing relevant state variables for how picking is done also overrides this method.

Reimplemented from SoNode.

SbBool SoBumpMap::readImage const SbString fname,
int &  w,
int &  h,
int &  nc,
unsigned char *&  bytes
[static]
 

Not implemented. Was added to the API by mistake. Will be removed in Coin 3.

SbBool SoBumpMap::readInstance SoInput in,
unsigned short  flags
[protected, virtual]
 

This method is mainly intended for internal use during file import operations.

It reads a definition of an instance from the input stream in. The input stream state points to the start of a serialized / persistant representation of an instance of this class type.

TRUE or FALSE is returned, depending on if the instantiation and configuration of the new object of this class type went ok or not. The import process should be robust and handle corrupted input streams by returning FALSE.

flags is used internally during binary import when reading user extension nodes, group nodes or engines.

Reimplemented from SoNode.

void SoBumpMap::notify SoNotList l  )  [protected, virtual]
 

Notifies all auditors for this instance when changes are made.

Reimplemented from SoNode.


Member Data Documentation

SoSFString SoBumpMap::filename
 

Bump map (or normal map) filename, referring to a file on disk in a supported image bitmap format. See SoBumpMap::filename for more information.

SoSFImage SoBumpMap::image
 

Inline image data. Defaults to contain an empty bump map.

SoSFEnum SoBumpMap::wrapS
 

Wrapping strategy for the S coordinate when the bump map is narrower than the object to map unto.

Default value is SoBumpMap::REPEAT.

SoSFEnum SoBumpMap::wrapT
 

Wrapping strategy for the T coordinate when the bump map is shorter than the object to map unto.

Default value is SoBumpMap::REPEAT.


The documentation for this class was generated from the following files:

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Generated on Wed Jul 28 00:04:24 2004 for Coin by Doxygen. 1.3.7