trusty (3) SoSphere.3.gz

NAME

       SoSphere -

       The SoSphere class is for rendering sphere shapes.

       Renders a sphere with the size given by the SoSphere::radius field. The sphere is rendered with the
       current material, texture and drawstyle settings (if any, otherwise the default settings are used).

SYNOPSIS

       #include <Inventor/nodes/SoSphere.h>

       Inherits SoShape.

   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.
       SoSphere (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 ~SoSphere ()
       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 SoSphere class is for rendering sphere shapes.

       Renders a sphere with the size given by the SoSphere::radius field. The sphere is rendered with the
       current material, texture and drawstyle settings (if any, otherwise the default settings are used).

       The SoSphere node class is provided as a convenient abstraction for the application programmer to use
       'complex' shapes of this type without having to do the tessellation to polygons and other low-level
       programming herself.

       A good trick for rendering ellipsoidal 3D shapes is to use an SoSphere prefixed with an SoScale
       transformation to 'flatten' it along one or more of the principal axes. (Ie use for instance an SoScale
       node with SoScale::scaleFactor equal to [1, 1, 0.1] to flatten it along the Z direction.)

       A sphere is visualized by the underlying rendering system by first tessellating the conceptual sphere
       into a set of polygons. To control the trade-off between an as much as possible correct visual appearance
       of the sphere versus fast rendering, use an SoComplexity node to influence the number of polygons
       generated from the tessellation process. (The higher the complexity value, the more polygons will be
       generated, the more rounded the sphere will look.) Set the SoComplexity::value field to what you believe
       would be a good trade-off between correctness and speed for your particular application.

       FILE FORMAT/DEFAULTS:

       Sphere {
           radius 1
       }

       See Also:
           SoCone, SoCylinder, SoCube

Constructor & Destructor Documentation

   SoSphere::SoSphere (void)
       Constructor.

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

Member Function Documentation

   SoType SoSphere::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 SoShape.

   const SoFieldData * SoSphere::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 SoShape.

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

       Reimplemented from SoShape.

   void SoSphere::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 SoSphere::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 SoSphere::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 SoSphere::radius
       Radius of sphere. Default value is 1.0.

Author

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