NAME

       SoVRMLSphere -

       The SoVRMLSphere class is used to represent a spherical 3D object.

       The detailed class documentation is taken verbatim from the VRML97 standard (ISO/IEC
       14772-1:1997). It is copyright The Web3D Consortium, and is used by permission of the
       Consortium:

SYNOPSIS

       #include <Inventor/VRMLnodes/SoVRMLSphere.h>

       Inherits SoVRMLGeometry.

   Public Member Functions
       virtual SoType getTypeId (void) const
           Returns the type identification of an object derived from a class inheriting SoBase.
           This is used for run-time type checking and 'downward' casting.
       SoVRMLSphere (void)
       virtual void GLRender (SoGLRenderAction *action)
       virtual void rayPick (SoRayPickAction *action)
       virtual void getPrimitiveCount (SoGetPrimitiveCountAction *action)

   Static Public Member Functions
       static SoType getClassTypeId (void)
       static void initClass (void)

   Public Attributes
       SoSFFloat radius

   Protected Member Functions
       virtual const SoFieldData * getFieldData (void) const
       virtual ~SoVRMLSphere ()
       virtual void generatePrimitives (SoAction *action)
       virtual void computeBBox (SoAction *action, SbBox3f &box, SbVec3f &center)

   Static Protected Member Functions
       static const SoFieldData ** getFieldDataPtr (void)

   Additional Inherited Members

Detailed Description

       The SoVRMLSphere class is used to represent a spherical 3D object.

       The detailed class documentation is taken verbatim from the VRML97 standard (ISO/IEC
       14772-1:1997). It is copyright The Web3D Consortium, and is used by permission of the
       Consortium:

       Sphere {
         field SFFloat radius  1    # (0, inf)
       }

       The Sphere node specifies a sphere centred at (0, 0, 0) in the local coordinate system.
       The radius field specifies the radius of the sphere and shall be greater than zero. Figure
       6.15 depicts the fields of the Sphere node.

         Figure 6.15 -- Sphere node

       When a texture is applied to a sphere, the texture covers the entire surface, wrapping
       counterclockwise from the back of the sphere (i.e., longitudinal arc intersecting the -Z-
       axis) when viewed from the top of the sphere. The texture has a seam at the back where the
       X=0 plane intersects the sphere and Z values are negative. TextureTransform affects the
       texture coordinates of the Sphere. The Sphere node's geometry requires outside faces only.
       When viewed from the inside the results are undefined.

Constructor & Destructor Documentation

   SoVRMLSphere::SoVRMLSphere (void)
       Constructor.

   SoVRMLSphere::~SoVRMLSphere () [protected],  [virtual]
       Destructor.

Member Function Documentation

   SoType SoVRMLSphere::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.

       Reimplemented from SoVRMLGeometry.

   const SoFieldData * SoVRMLSphere::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 SoVRMLGeometry.

   void SoVRMLSphere::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 SoShape.

   void SoVRMLSphere::rayPick (SoRayPickAction *action) [virtual]
       Calculates picked point based on primitives generated by subclasses.

       Reimplemented from SoShape.

   void SoVRMLSphere::getPrimitiveCount (SoGetPrimitiveCountAction *action) [virtual]
       Action method for the SoGetPrimitiveCountAction.

       Calculates the number of triangle, line segment and point primitives for the node and adds
       these to the counters of the action.

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

       Reimplemented from SoShape.

   void SoVRMLSphere::generatePrimitives (SoAction *action) [protected],  [virtual]
       The method implements action behavior for shape nodes for SoCallbackAction. It is invoked
       from SoShape::callback(). (Subclasses should not override SoNode::callback().)

       The subclass implementations uses the convenience methods SoShape::beginShape(),
       SoShape::shapeVertex(), and SoShape::endShape(), with SoDetail instances, to pass the
       primitives making up the shape back to the caller.

       Implements SoShape.

   void SoVRMLSphere::computeBBox (SoAction *action, SbBox3f &box, SbVec3f &center) [protected],
       [virtual]
       Implemented by SoShape subclasses to let the SoShape superclass know the exact size and
       weighted center point of the shape's bounding box.

       The bounding box and center point should be calculated and returned in the local
       coordinate system.

       The method implements action behavior for shape nodes for SoGetBoundingBoxAction. It is
       invoked from SoShape::getBoundingBox(). (Subclasses should not override
       SoNode::getBoundingBox().)

       The box parameter sent in is guaranteed to be an empty box, while center is undefined upon
       function entry.

       Implements SoShape.

Member Data Documentation

   SoSFFloat SoVRMLSphere::radius
       Sphere radius. Default value is 1.0.

Author

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