SoOverrideElement(3)

NAME
SoOverrideElement - The SoOverrideElement maintains a list of overridable elements and a list over which elements should be overridden.

Only certain elements can be overridden.

SYNOPSIS

#include <Inventor/elements/SoOverrideElement.h>

Inherits SoElement.

  Public Types
enum FlagBits { AMBIENT_COLOR = 0x00000001, COLOR_INDEX = 0x00000002, COMPLEXITY = 0x00000004, COMPLEXITY_TYPE = 0x00000008, CREASE_ANGLE = 0x00000010, DIFFUSE_COLOR = 0x00000020, DRAW_STYLE = 0x00000040, EMISSIVE_COLOR = 0x00000080, FONT_NAME = 0x00000100, FONT_SIZE = 0x00000200, LIGHT_MODEL = 0x00000400, LINE_PATTERN = 0x00000800, LINE_WIDTH = 0x00001000, MATERIAL_BINDING = 0x00002000, POINT_SIZE = 0x00004000, PICK_STYLE = 0x00008000, SHAPE_HINTS = 0x00010000, SHININESS = 0x00020000, SPECULAR_COLOR = 0x00040000, POLYGON_OFFSET = 0x00080000, TRANSPARENCY = 0x00100000, TRANSPARENCY_TYPE = 0x00200000, NORMAL_VECTOR = 0x00400000, NORMAL_BINDING = 0x00800000 }

  Public Member Functions
virtual void init (SoState *state)
FIXME: write doc.
virtual void push (SoState *state)
FIXME: write doc.
virtual SbBool matches (const SoElement *element) const
FIXME: write doc.
virtual SoElement * copyMatchInfo (void) const
FIXME: write doc.
virtual void print (FILE *file) const
FIXME: write doc.

  Static Public Member Functions
static SoType getClassTypeId (void)
static int getClassStackIndex (void)
static void * createInstance (void)
static void initClass (void)
static uint32_t getFlags (SoState *const state)
static SbBool getAmbientColorOverride (SoState *const state)
static SbBool getColorIndexOverride (SoState *const state)
static SbBool getComplexityOverride (SoState *const state)
static SbBool getComplexityTypeOverride (SoState *const state)
static SbBool getCreaseAngleOverride (SoState *const state)
static SbBool getDiffuseColorOverride (SoState *const state)
static SbBool getDrawStyleOverride (SoState *const state)
static SbBool getEmissiveColorOverride (SoState *const state)
static SbBool getFontNameOverride (SoState *const state)
static SbBool getFontSizeOverride (SoState *const state)
static SbBool getLightModelOverride (SoState *const state)
static SbBool getLinePatternOverride (SoState *const state)
static SbBool getLineWidthOverride (SoState *const state)
static SbBool getMaterialBindingOverride (SoState *const state)
static SbBool getPickStyleOverride (SoState *const state)
static SbBool getPointSizeOverride (SoState *const state)
static SbBool getPolygonOffsetOverride (SoState *const state)
static SbBool getShapeHintsOverride (SoState *const state)
static SbBool getShininessOverride (SoState *const state)
static SbBool getSpecularColorOverride (SoState *const state)
static SbBool getTransparencyOverride (SoState *const state)
static SbBool getTransparencyTypeOverride (SoState *const state)
static SbBool getNormalVectorOverride (SoState *const state)
static SbBool getNormalBindingOverride (SoState *const state)
static void setAmbientColorOverride (SoState *const state, SoNode *const node, const SbBool override)
static void setColorIndexOverride (SoState *const state, SoNode *const node, const SbBool override)
static void setComplexityOverride (SoState *const state, SoNode *const node, const SbBool override)
static void setComplexityTypeOverride (SoState *const state, SoNode *const node, const SbBool override)
static void setCreaseAngleOverride (SoState *const state, SoNode *const node, const SbBool override)
static void setDiffuseColorOverride (SoState *const state, SoNode *const node, const SbBool override)
static void setDrawStyleOverride (SoState *const state, SoNode *const node, const SbBool override)
static void setEmissiveColorOverride (SoState *const state, SoNode *const node, const SbBool override)
static void setFontNameOverride (SoState *const state, SoNode *const node, const SbBool override)
static void setFontSizeOverride (SoState *const state, SoNode *const node, const SbBool override)
static void setLightModelOverride (SoState *const state, SoNode *const node, const SbBool override)
static void setLinePatternOverride (SoState *const state, SoNode *const node, const SbBool override)
static void setLineWidthOverride (SoState *const state, SoNode *const node, const SbBool override)
static void setMaterialBindingOverride (SoState *const state, SoNode *const node, const SbBool override)
FIXME: write doc.
static void setPickStyleOverride (SoState *const state, SoNode *const node, const SbBool override)
static void setPointSizeOverride (SoState *const state, SoNode *const node, const SbBool override)
static void setPolygonOffsetOverride (SoState *const state, SoNode *const node, const SbBool override)
static void setShapeHintsOverride (SoState *const state, SoNode *const node, const SbBool override)
static void setShininessOverride (SoState *const state, SoNode *const node, const SbBool override)
static void setSpecularColorOverride (SoState *const state, SoNode *const node, const SbBool override)
static void setTransparencyOverride (SoState *const state, SoNode *const node, const SbBool override)
static void setTransparencyTypeOverride (SoState *const state, SoNode *const node, const SbBool override)
static void setNormalVectorOverride (SoState *const state, SoNode *const node, const SbBool override)
static void setNormalBindingOverride (SoState *const state, SoNode *const node, const SbBool override)

  Protected Member Functions
virtual ~SoOverrideElement ()

  Additional Inherited Members

Detailed Description

The SoOverrideElement maintains a list of overridable elements and a list over which elements should be overridden.

Only certain elements can be overridden. The remaining class documentation describes a single, special case:

A common request for functionality is to override only the transparency of the full scene graph, or parts of the scene graph.

In the original SGI Inventor, this is nigh impossible, as the API was designed to only make it possible to override all or none of the fields of a node. So calling SoNode::setOverride() on an SoMaterial node will cause all material settings of that node to override all material settings further on in the scene graph, and there is no way to override only the transparency settings.

In Coin, we have added in a little hack to overcome this problem, since it is such a common request for functionality: to have separate transparency override settings, set the environment variable COIN_SEPARATE_DIFFUSE_TRANSPARENCY_OVERRIDE to '1' to enable this hack.

(Do however note that this will not work when the SoPackedColor or SoVertexProperty node is used to specify diffuse color and transparency -- only with the SoMaterial node.)

Here is a complete, stand-alone example which demonstrates how to accomplish this:

#include <Inventor/Qt/SoQt.h>
#include <Inventor/Qt/viewers/SoQtExaminerViewer.h>
#include <Inventor/nodes/SoSeparator.h>
#include <Inventor/nodes/SoMaterial.h>
// *************************************************************************
const char * scene = "#Inventor V2.1 asci
"
"Separator {"
"   Cone { }"
"   Translation { translation 1 0 5 }"
""
"   DEF OVERRIDEMATERIAL Material { transparency 0.5 }"
""
"   DEF OBJMATERIAL Material {"
"      diffuseColor 0.5 0 0"
"      transparency 0"
"   }"
"   Sphere { }"
"}"
;
int
main(int argc, char ** argv)
{
  QWidget * window = SoQt::init(argv[0]);
  (void)coin_setenv("COIN_SEPARATE_DIFFUSE_TRANSPARENCY_OVERRIDE", "1", TRUE);
  SoInput * in = new SoInput;
  in->setBuffer((void *)scene, strlen(scene));
  SoSeparator * root = SoDB::readAll(in);
  assert(root);
  delete in;
  root->ref();
  SoMaterial * overridemat = (SoMaterial *)
    SoBase::getNamedBase("OVERRIDEMATERIAL", SoMaterial::getClassTypeId());
  assert(overridemat);
  overridemat->diffuseColor.setIgnored(TRUE);
  overridemat->setOverride(TRUE);
  SoQtExaminerViewer * viewer = new SoQtExaminerViewer(window);
  viewer->setSceneGraph(root);
  viewer->show();
  SoQt::show(window);
  SoQt::mainLoop();
  delete viewer;
  root->unref();
  return 0;
}

Member Enumeration Documentation

  enum SoOverrideElement::FlagBits
FIXME: write doc.

Constructor & Destructor Documentation

  SoOverrideElement::~SoOverrideElement (void) [protected], [virtual]
The destructor.

Member Function Documentation

  void * SoOverrideElement::createInstance (void) [static]
This API member is considered internal to the library, as it is not likely to be of interest to the application programmer.

  void SoOverrideElement::initClass (void) [static]
This static method initializes static data for the SoOverrideElement class.

  SbBool SoOverrideElement::getAmbientColorOverride (SoState *const state) [static]
FIXME: write doc.

  SbBool SoOverrideElement::getColorIndexOverride (SoState *const state) [static]
FIXME: write doc.

  SbBool SoOverrideElement::getComplexityOverride (SoState *const state) [static]
FIXME: write doc.

  SbBool SoOverrideElement::getComplexityTypeOverride (SoState *const state) [static]
FIXME: write doc.

  SbBool SoOverrideElement::getCreaseAngleOverride (SoState *const state) [static]
FIXME: write doc.

  SbBool SoOverrideElement::getDiffuseColorOverride (SoState *const state) [static]
FIXME: write doc.

  SbBool SoOverrideElement::getDrawStyleOverride (SoState *const state) [static]
FIXME: write doc.

  SbBool SoOverrideElement::getEmissiveColorOverride (SoState *const state) [static]
FIXME: write doc.

  SbBool SoOverrideElement::getFontNameOverride (SoState *const state) [static]
FIXME: write doc.

  SbBool SoOverrideElement::getFontSizeOverride (SoState *const state) [static]
FIXME: write doc.

  SbBool SoOverrideElement::getLightModelOverride (SoState *const state) [static]
FIXME: write doc.

  SbBool SoOverrideElement::getLinePatternOverride (SoState *const state) [static]
FIXME: write doc.

  SbBool SoOverrideElement::getLineWidthOverride (SoState *const state) [static]
FIXME: write doc.

  SbBool SoOverrideElement::getMaterialBindingOverride (SoState *const state) [static]
FIXME: write doc.

  SbBool SoOverrideElement::getPickStyleOverride (SoState *const state) [static]
FIXME: write doc.

  SbBool SoOverrideElement::getPointSizeOverride (SoState *const state) [static]
FIXME: write doc.

  SbBool SoOverrideElement::getPolygonOffsetOverride (SoState *const state) [static]
FIXME: write doc.

  SbBool SoOverrideElement::getShapeHintsOverride (SoState *const state) [static]
FIXME: write doc.

  SbBool SoOverrideElement::getShininessOverride (SoState *const state) [static]
FIXME: write doc.

  SbBool SoOverrideElement::getSpecularColorOverride (SoState *const state) [static]
FIXME: write doc.

  SbBool SoOverrideElement::getTransparencyOverride (SoState *const state) [static]
FIXME: write doc.

  SbBool SoOverrideElement::getTransparencyTypeOverride (SoState *const state) [static]
FIXME: write doc.

  SbBool SoOverrideElement::getNormalVectorOverride (SoState *const state) [static]
Returns normal vector override value.

Since:
    Coin 2.0

  SbBool SoOverrideElement::getNormalBindingOverride (SoState *const state) [static]
Returns normal binding override value.

Since:
    Coin 2.0

  void SoOverrideElement::setAmbientColorOverride (SoState *const state, SoNode *const node, const SbBool override) [static]
FIXME: write doc.

  void SoOverrideElement::setColorIndexOverride (SoState *const state, SoNode *const node, const SbBool override) [static]
FIXME: write doc.

  void SoOverrideElement::setComplexityOverride (SoState *const state, SoNode *const node, const SbBool override) [static]
FIXME: write doc.

  void SoOverrideElement::setComplexityTypeOverride (SoState *const state, SoNode *const node, const SbBool override) [static]
FIXME: write doc.

  void SoOverrideElement::setCreaseAngleOverride (SoState *const state, SoNode *const node, const SbBool override) [static]
FIXME: write doc.

  void SoOverrideElement::setDiffuseColorOverride (SoState *const state, SoNode *const node, const SbBool override) [static]
Can be used to set diffuse color override. This will also set the transparency override. Since we feel this is a design flaw, it is possible to override this behaviour by setting an environement value called COIN_SEPARATE_DIFFUSE_TRANSPARENCY_OVERRIDE to 1.

Please note that separate override will not work for the PackedColor or SoVertexProperty nodes.

  void SoOverrideElement::setDrawStyleOverride (SoState *const state, SoNode *const node, const SbBool override) [static]
FIXME: write doc.

  void SoOverrideElement::setEmissiveColorOverride (SoState *const state, SoNode *const node, const SbBool override) [static]
FIXME: write doc.

  void SoOverrideElement::setFontNameOverride (SoState *const state, SoNode *const node, const SbBool override) [static]
FIXME: write doc.

  void SoOverrideElement::setFontSizeOverride (SoState *const state, SoNode *const node, const SbBool override) [static]
FIXME: write doc.

  void SoOverrideElement::setLightModelOverride (SoState *const state, SoNode *const node, const SbBool override) [static]
FIXME: write doc.

  void SoOverrideElement::setLinePatternOverride (SoState *const state, SoNode *const node, const SbBool override) [static]
FIXME: write doc.

  void SoOverrideElement::setLineWidthOverride (SoState *const state, SoNode *const node, const SbBool override) [static]
FIXME: write doc.

  void SoOverrideElement::setPickStyleOverride (SoState *const state, SoNode *const node, const SbBool override) [static]
FIXME: write doc.

  void SoOverrideElement::setPointSizeOverride (SoState *const state, SoNode *const node, const SbBool override) [static]
FIXME: write doc.

  void SoOverrideElement::setPolygonOffsetOverride (SoState *const state, SoNode *const node, const SbBool override) [static]
FIXME: write doc.

  void SoOverrideElement::setShapeHintsOverride (SoState *const state, SoNode *const node, const SbBool override) [static]
FIXME: write doc.

  void SoOverrideElement::setShininessOverride (SoState *const state, SoNode *const node, const SbBool override) [static]
FIXME: write doc.

  void SoOverrideElement::setSpecularColorOverride (SoState *const state, SoNode *const node, const SbBool override) [static]
FIXME: write doc.

  void SoOverrideElement::setTransparencyOverride (SoState *const state, SoNode *const node, const SbBool override) [static]
Can be used to set the transparency override.

See also:
    setDiffuseColorOverride().

  void SoOverrideElement::setTransparencyTypeOverride (SoState *const state, SoNode *const node, const SbBool override) [static]
Can be used to set the transparency type override.

See also:
    setDiffuseColorOverride().

  void SoOverrideElement::setNormalVectorOverride (SoState *const state, SoNode *const node, const SbBool override) [static]
Can be used to set normal vector override.

Since:
    Coin 2.0

  void SoOverrideElement::setNormalBindingOverride (SoState *const state, SoNode *const node, const SbBool override) [static]
Can be used to set normal binding override.

Since:
    Coin 2.0

Author

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