SoVRMLCylinder - Online Linux Manual PageSection : 3
Updated : Mon Jan 25 2021
Source : Version 2.5.0
Note : Coin
NAMESoVRMLCylinder − The SoVRMLCylinder class is used to represent a cylinder object.
SYNOPSIS
#include <Inventor/VRMLnodes/SoVRMLCylinder.h> Inherits SoVRMLGeometry.
Public Member Functionsvirtual SoType getTypeId (void) const
SoVRMLCylinder (void)
virtual void GLRender (SoGLRenderAction *action)
virtual void rayPick (SoRayPickAction *action)
virtual void getPrimitiveCount (SoGetPrimitiveCountAction *action)
Static Public Member Functionsstatic SoType getClassTypeId (void)
static void initClass (void)
Public AttributesSoSFFloat radius
SoSFFloat height
SoSFBool side
SoSFBool top
SoSFBool bottom
Protected Member Functionsvirtual const SoFieldData * getFieldData (void) const
virtual ~SoVRMLCylinder ()
virtual void generatePrimitives (SoAction *action)
virtual void computeBBox (SoAction *action, SbBox3f &box, SbVec3f ¢er)
Static Protected Member Functionsstatic const SoFieldData ** getFieldDataPtr (void)
Additional Inherited Members
Detailed DescriptionThe SoVRMLCylinder class is used to represent a cylinder 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:
Cylinder {
field SFBool bottom TRUE
field SFFloat height 2 # (0,)
field SFFloat radius 1 # (0,)
field SFBool side TRUE
field SFBool top TRUE
}
The Cylinder node specifies a capped cylinder centred at (0,0,0) in the local coordinate system and with a central axis oriented along the local Y-axis. By default, the cylinder is sized at '-1' to '+1' in all three dimensions. The radius field specifies the radius of the cylinder and the height field specifies the height of the cylinder along the central axis. Both radius and height shall be greater than zero. Figure 6.4 illustrates the Cylinder node. The cylinder has three parts: the side, the top (Y = +height/2) and the bottom (Y = -height/2). Each part has an associated SFBool field that indicates whether the part exists (TRUE) or does not exist (FALSE). Parts which do not exist are not rendered and not eligible for intersection tests (e.g., collision detection or sensor activation).
Figure 6.4 When a texture is applied to a cylinder, it is applied differently to the sides, top, and bottom. On the sides, the texture wraps counterclockwise (from above) starting at the back of the cylinder. The texture has a vertical seam at the back, intersecting the X=0 plane. For the top and bottom caps, a circle is cut out of the unit texture squares centred at (0, +/- height/2, 0) with dimensions 2 × radius by 2 × radius. The top texture appears right side up when the top of the cylinder is tilted toward the +Z-axis, and the bottom texture appears right side up when the top of the cylinder is tilted toward the -Z-axis. SoVRMLTextureTransform affects the texture coordinates of the Cylinder node. The Cylinder node's geometry requires outside faces only. When viewed from the inside the results are undefined.
Constructor & Destructor Documentation
SoVRMLCylinder::SoVRMLCylinder (void)Constructor. References bottom, height, radius, side, and top.
SoVRMLCylinder::~SoVRMLCylinder () [protected], [virtual]Destructor.
Member Function Documentation
SoType SoVRMLCylinder::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
}
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. Reimplemented from SoVRMLGeometry.
const SoFieldData * SoVRMLCylinder::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 SoVRMLCylinder::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. References bottom, SoShape::getComplexityValue(), SoAction::getState(), radius, SoVRMLGeometry::shouldGLRender(), side, and top.
void SoVRMLCylinder::rayPick (SoRayPickAction * action) [virtual]Calculates picked point based on primitives generated by subclasses. Reimplemented from SoShape. References bottom, radius, SoShape::shouldRayPick(), side, and top.
void SoVRMLCylinder::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. References SoGetPrimitiveCountAction::addNumTriangles(), bottom, SoShape::getComplexityValue(), SoShape::shouldPrimitiveCount(), side, and top.
void SoVRMLCylinder::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. References bottom, SoShape::getComplexityValue(), radius, side, and top.
void SoVRMLCylinder::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. References bottom, height, radius, SbBox3f::setBounds(), SbVec3f::setValue(), side, and top.
Member Data Documentation
SoSFFloat SoVRMLCylinder::radiusThe cylinder radius. Default value is 1.0. Referenced by computeBBox(), generatePrimitives(), GLRender(), rayPick(), and SoVRMLCylinder().
SoSFFloat SoVRMLCylinder::heightThe cylinder height. Default value is 2.0. Referenced by computeBBox(), and SoVRMLCylinder().
SoSFBool SoVRMLCylinder::sideEnable/disable the cylinder side wall. Default value is TRUE. Referenced by computeBBox(), generatePrimitives(), getPrimitiveCount(), GLRender(), rayPick(), and SoVRMLCylinder().
SoSFBool SoVRMLCylinder::topEnable/disable the cylinder top. Default value is TRUE. Referenced by computeBBox(), generatePrimitives(), getPrimitiveCount(), GLRender(), rayPick(), and SoVRMLCylinder().
SoSFBool SoVRMLCylinder::bottomEnable/disable the cylinder bottom. Default value is TRUE. Referenced by computeBBox(), generatePrimitives(), getPrimitiveCount(), GLRender(), rayPick(), and SoVRMLCylinder().
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Johanes Gumabo
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