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SoQuadMesh Class Reference
[Nodes]

The SoQuadMesh class is used to render and optimize a quadrilateral mesh. More...

#include <Inventor/nodes/SoQuadMesh.h>

Inheritance diagram for SoQuadMesh:

SoNonIndexedShape SoVertexShape SoShape SoNode SoFieldContainer SoBase List of all members.

Public Member Functions

 SoQuadMesh (void)
virtual void GLRender (SoGLRenderAction *action)
virtual void getPrimitiveCount (SoGetPrimitiveCountAction *action)
virtual SbBool generateDefaultNormals (SoState *state, SoNormalBundle *nb)

Static Public Member Functions

void initClass (void)

Public Attributes

SoSFInt32 verticesPerColumn
SoSFInt32 verticesPerRow

Protected Member Functions

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

Detailed Description

The SoQuadMesh class is used to render and optimize a quadrilateral mesh.

This node uses the coordinates in order, either from the state or from the SoQuadMesh::vertexProperty node, to construct a quadrilateral mesh.

The quads are generated in row major order, using the two fields SoQuadMesh::verticesPerColumn and SoQuadMesh::verticesPerRow to specify the mesh. E.g. if SoQuadMesh::verticesPerColumn is 3 and SoQuadMesh::verticesPerRow is 2, two quads will be generated with the first one using (in order) coordinates 0, 1, 3 and 2, the second one using coordinates 2, 3, 5 and 4 (you get three rows of vertices; the first row uses vertices 0 and 1, the second row 2 and 3, and the third row 4 and 5).

Here's a quick and simple usage example code snippet:

// Vertices for the Quad mesh. static float vertices[25][3] = { // Row 1 {-11, 0, 1}, {0, 11, 1}, {11, 0, 1}, {0, -11, 1}, {-11, 0, 1}, // Row 2 {-9, 0, 1}, {0, 9, 1}, {9, 0, 1}, {0, -9, 1}, {-9, 0, 1}, // Row 3 {-9, 0, -1}, {0, 9, -1}, {9, 0, -1}, {0, -9, -1}, {-9, 0, -1}, // Row 4 {-11, 0, -1}, {0, 11, -1}, {11, 0, -1}, {0, -11, -1}, {-11, 0, -1}, // Row 5 {-11, 0, 1}, {0, 11, 1}, {11, 0, 1}, {0, -11, 1}, {-11, 0, 1} }; // This function generate an object by using the SoQuadMesh node // Return: // SoSeparator * static SoSeparator * quadMesh(void) { SoSeparator * qm = new SoSeparator; // Define coordinates SoCoordinate3 * coords = new SoCoordinate3; coords->point.setValues(0, 30, vertices); qm->addChild(coords); // QuadMesh SoQuadMesh * mesh = new SoQuadMesh; mesh->verticesPerRow = 5; mesh->verticesPerColumn = 5; qm->addChild(mesh); return qm; }

The quadmesh geometry resulting from this code looks like this:<br>

quadmesh.png

For SoQuadMesh, normals and materials can be bound PER_PART (per row), PER_FACE, PER_VERTEX and OVERALL. The default material binding is OVERALL. The default normal binding is PER_VERTEX.

See also:
SoTriangleStripSet SoIndexedTriangleStripSet


Constructor & Destructor Documentation

SoQuadMesh::SoQuadMesh void   ) 
 

Constructor.

SoQuadMesh::~SoQuadMesh  )  [protected, virtual]
 

Destructor.


Member Function Documentation

void SoQuadMesh::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 sogl_qmesh_m3_n3_t1 void SoQuadMesh::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 SoQuadMesh::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 SoQuadMesh::generateDefaultNormals SoState state,
SoNormalBundle *  nb
[virtual]
 

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.

Reimplemented from SoVertexShape.

void SoQuadMesh::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 SoQuadMesh::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 SoQuadMesh::generateDefaultNormals SoState state,
SoNormalCache *  nc
[protected, virtual]
 

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 method is not part of the original SGI Open Inventor API.

Reimplemented from SoVertexShape.


Member Data Documentation

SoSFInt32 SoQuadMesh::verticesPerColumn
 

Specifies to number of vertices in each column.

SoSFInt32 SoQuadMesh::verticesPerRow
 

Specifies the number of vertices in each row.


The documentation for this class was generated from the following files:
Generated on Tue Jul 27 23:53:07 2004 for Coin by doxygen 1.3.7