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NAME

       SoTriangleStripSet -

       The SoTriangleStripSet class is used to render and control non-indexed triangle strips.

       Triangle strips are specified using the numVertices field.

SYNOPSIS

       #include <Inventor/nodes/SoTriangleStripSet.h>

       Inherits SoNonIndexedShape.

   Public Member Functions
       SoTriangleStripSet (void)
       virtual void GLRender (SoGLRenderAction *action)
       virtual void getPrimitiveCount (SoGetPrimitiveCountAction *action)
       virtual SbBool generateDefaultNormals (SoState *state, SoNormalBundle *nb)

   Static Public Member Functions
       static void initClass (void)

   Public Attributes
       SoMFInt32 numVertices

   Protected Member Functions
       virtual ~SoTriangleStripSet ()
       virtual void generatePrimitives (SoAction *action)
       virtual void computeBBox (SoAction *action, SbBox3f &box, SbVec3f &center)
       virtual SbBool generateDefaultNormals (SoState *, SoNormalCache *)

Detailed Description

       The SoTriangleStripSet class is used to render and control non-indexed triangle strips.

       Triangle strips are specified using the numVertices field.

       Coordinates, normals, materials and texture coordinates are all fetched in order from the
       current state or from the vertexProperty node if set. (To render triangle strips from
       vertex indices, use the SoIndexedTriangleStripSet node.)

       The numVertices field may be used for multiple strips, coordinates will be fetched with a
       monotonically increasing index from the coordinates on the traversal state stack (i.e.
       typically from the last SoCoordinate3 node encountered during traversal).

       For example, if numVertices is set to [3, 4, 5, 3], this node would specify a triangle
       from coordinates 0, 1 and 2, a triangle strip from coordinates 3, 4, 5 and 6, a triangle
       strip from coordinates 7, 8, 9, 10 and 11 and finally a triangle from coordinates 12, 13,
       14.

       Or to put it another way: in a tristrip there will always be two vertices more than there
       are triangles. Realize that you are handling data on the vertex level (not polygon-level),
       and that the triangles are laid out like this, given 5 vertices:

         1-----3-----5
             /    /
            /    /
            2-----4

         .fi

       The above figure in scene graph file format:

         #Inventor V2.1 ascii

         Separator {
           Coordinate3 {
             point [ -2 1 0, -1 -1 0, 0 1 0, 1 -1 0, 2 1 0 ]
           }

           TriangleStripSet {
             numVertices [ 5 ]
           }
         }
         .fi

       The scene graph above in a viewer:

       Strips are converted into triangles the way OpenGL does it, of course, so for the dirty details, check out the documentation of OpenGL's GL_TRIANGLE_STRIP primitive rendering type.

       Binding PER_PART (per strip), PER_VERTEX, PER_FACE or OVERALL can be set for material, and normals. The default material binding is OVERALL. The default normal binding is PER_VERTEX.

       FILE FORMAT/DEFAULTS:

           TriangleStripSet {
               vertexProperty NULL
               startIndex 0
               numVertices -1
           }

       See also:
           SoIndexedTriangleStripSet

Constructor & Destructor Documentation

   SoTriangleStripSet::SoTriangleStripSet (void) Constructor.
   SoTriangleStripSet::~SoTriangleStripSet () [protected, virtual] Destructor.

Member Function Documentation

   void SoTriangleStripSet::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 SoNonIndexedShape.

   void SoTriangleStripSet::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 SoTriangleStripSet::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.

   SbBool SoTriangleStripSet::generateDefaultNormals (SoState *state, SoNormalBundle *bundle)
       [virtual] This API member is considered internal to the library, as it is not likely to be
       of interest to the application programmer.
       Subclasses should override this method to generate default normals using the
       SoNormalBundle class. TRUE should be returned if normals were generated, FALSE otherwise.

       Default method returns FALSE.

       This function is an extension for Coin, and it is not available in the original SGI Open
       Inventor v2.1 API.

       Reimplemented from SoVertexShape.

   void SoTriangleStripSet::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 SoTriangleStripSet::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.

   SbBool SoTriangleStripSet::generateDefaultNormals (SoState *state, SoNormalCache *cache)
       [protected, virtual] This API member is considered internal to the library, as it is not
       likely to be of interest to the application programmer.
       Subclasses should override this method to generate default normals using the SoNormalCache
       class. This is more effective than using SoNormalGenerator. Return TRUE if normals were
       generated, FALSE otherwise.

       Default method just returns FALSE.

       This function is an extension for Coin, and it is not available in the original SGI Open
       Inventor v2.1 API.

       Reimplemented from SoVertexShape.

Member Data Documentation

   SoMFInt32 SoTriangleStripSet::numVertices Specifies the number of vertices in each triangle
       strip. The vertices are fetched from the current coordinate node, or from the
       vertexProperty field if present.

Author

       Generated automatically by Doxygen for Coin from the source code.