enum VertexOrdering { UNKNOWN_ORDERING = SoShapeHintsElement::UNKNOWN_ORDERING, CLOCKWISE = SoShapeHintsElement::CLOCKWISE, COUNTERCLOCKWISE = SoShapeHintsElement::COUNTERCLOCKWISE }

enum ShapeType { UNKNOWN_SHAPE_TYPE = SoShapeHintsElement::UNKNOWN_SHAPE_TYPE, SOLID = SoShapeHintsElement::SOLID }

enum FaceType { UNKNOWN_FACE_TYPE = SoShapeHintsElement::UNKNOWN_FACE_TYPE, CONVEX = SoShapeHintsElement::CONVEX }

virtual SoType getTypeId (void) const

SoShapeHints (void)

virtual void doAction (SoAction *action)

virtual void GLRender (SoGLRenderAction *action)

virtual void callback (SoCallbackAction *action)

virtual void getBoundingBox (SoGetBoundingBoxAction *action)

virtual void pick (SoPickAction *action)

static SoType getClassTypeId (void)

static void initClass (void)

SoSFEnum vertexOrdering

SoSFEnum shapeType

SoSFEnum faceType

SoSFFloat creaseAngle

virtual const SoFieldData * getFieldData (void) const

virtual ~SoShapeHints ()

static const SoFieldData ** getFieldDataPtr (void)

Enumeration of available ways to specify ordering of vertices for a polygon.

Enumerator:

UNKNOWN_ORDERING

Ordering not known, render both sides of the polygon.

CLOCKWISE

Vertices are specified in a clockwise order.

COUNTERCLOCKWISE

Vertices are specified in a counter-clockwise order.

Enumeration of different shape types.

Enumerator:

UNKNOWN_SHAPE_TYPE

Nothing known about the shape, be conservative when rendering.

SOLID

The subsequent shapes in the graph are all known to be completely 'closed', solid 3D shapes. Backface culling will be done if vertexOrdering is known.

Enumeration of polygon face types.

Enumerator:

UNKNOWN_FACE_TYPE

Signifies: nothing is known about subsequent polygon data, be conservative when rendering.

All polygons in the scene will be analyzed to see if they needs to be tessellated (broken up) into triangles before passed on to the underlying immediate mode rendering system.

The OpenGL rendering system handles most complex polygon types, but not all: it can for instance have problems with many-sided, concave polygons (concave polygons are 'hollow', that is: rounded inwards). Coin's internal tessellator will most often handle the cases that OpenGL fails on.

So if you are seeing weird artifacts in how complex polygons are rendered, try to change the SoShapeHints::faceType field to this value and see if they are then rendered correctly.

Beware that turning on this functionality might have the effect of making the rendering performance worse. If it has a noticable effect on your particular scenegraph, we advise that you investigate whether you could change how the polygons are generated for Coin rendering and then avoid using this flag.

CONVEX

Subsequent faces are all convex, so turn off the check for and tessellation of inconvex faces.

Subsequent polygons from faceset-type nodes (like SoFaceSet and SoIndexedFaceSet) will be sent unmodified to OpenGL, thereby assuming that the polygons are in a form handled by OpenGL.

Constructor.

Destructor.

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

Reimplemented from SoNode.

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.

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.

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

Reimplemented from SoFieldContainer.

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

Reimplemented from SoNode.

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

Reimplemented from SoNode.

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.

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.

Action method for the SoGetBoundingBoxAction.

Calculates bounding box and center coordinates for node and modifies the values of the action to encompass the bounding box for this node and to shift the center point for the scene more towards the one for this node.

Nodes influencing how geometry nodes calculates their bounding box also overrides this method to change the relevant state variables.

Reimplemented from SoNode.

Action method for SoPickAction.

Does common processing for SoPickAction action instances.

Reimplemented from SoNode.

Specifies how vertices are ordered for polygon faces.

Set this field to SoShapeHints::CLOCKWISE or SoShapeHints::COUNTERCLOCKWISE if possible to turn on backface culling and thereby optimize rendering.

Default value is SoShapeHints::UNKNOWN_ORDERING.

Hint about whether or not shapes are known to be 'closed'. Default value is SoShapeHints::UNKNOWN_SHAPE_TYPE.

Hint about whether or not polygon faces are known to be convex. Default value is SoShapeHints::CONVEX.

When normals are automatically generated by Coin (i.e. SoNormal nodes are not used), this is the smallest angle between two faces where we would still calculate normals to do flatshading.

If the angle between the normals of two neighboring faces is less than the value of this field, the faces will be smoothshaded around their common edge.