Re: About SoVRMLOrientationInterpolator in TGS inventor

[Hiroshi Akiba <akiba@xxxxxxxxxxxxxxxxxxxxxxxx>]

Thank you for your advice.

Mike Heck wrote:

>  As far as I know it works.  You didn't say exactly what problem you
> are seeing or what code you are trying, but the most common problem
> is doing static intialization of an array of complex objects.  In
> this case it's particularly tricky because constructing an SbRotation
> from four floats causes the floats to be interpreted as a quaternion
> (rather than axis/angle).  I've found it easier/safer to use the
> set1Value method instead, like this:
>
>   const int numval = 3;
>   static float axis[][3] = {{1,0,0},{0,1,0},{0,0,1}};
>   static float angle[]  = {0, 3.14f, 3.14f};
>   SoVRMLOrientationInterpolator *pNode = new SoVRMLOrientationInterpolator;
>   for (int i = 0; i < numval; i++) {
>     pNode->keyValue.set1Value( i, SbRotation(axis[i],angle[i]) );
>   }
>
> -Mike
>  TGS Inc, http://www.tgs.com

What I would like to do is to make a simple animation that a cone rotates.
I was able to set rotation values to keyValue filed. But still, my program
doesn't
work. Could you tell me what the problem is?
Following are the sorce code. I am using TGS OIV 2.6  on Windows 98.

#include <Inventor/Xt/SoXt.h>
#include <Inventor/Xt/viewers/SoXtExaminerViewer.h>
#include <Inventor/VRMLnodes/SoVRMLCone.h>
#include <Inventor/VRMLnodes/SoVRMLDirectionalLight.h>
#include <Inventor/VRMLnodes/SoVRMLMaterial.h>
#include <Inventor/VRMLnodes/SoVRMLAppearance.h>
#include <Inventor/VRMLnodes/SoVRMLShape.h>
#include <Inventor/VRMLnodes/SoVRMLGroup.h>
#include <Inventor/VRMLnodes/SoVRMLOrientationInterpolator.h>
#include <Inventor/SbLinear.h>
#include <Inventor/nodes/SoTransform.h>
#include <Inventor/sensors/SoTimerSensor.h>
#include <Inventor/VRMLnodes/SoVRMLTimeSensor.h>
#include <Inventor/VRMLnodes/SoVRMLTransform.h>
#include <Inventor/SoDB.h>

#ifdef WIN32
#define main ivMain
#endif

void
main(int , char **argv)
{
   // Initialize Inventor. This returns a main window to use.
   // If unsuccessful, exit.
   Widget myWindow = SoXt::init(argv[0]); // pass the app name
   if (myWindow == NULL) exit(1);

   SoVRMLGroup *root = new SoVRMLGroup;
   SoVRMLMaterial *myMaterial = new SoVRMLMaterial;
   SoVRMLAppearance *myAppearance = new SoVRMLAppearance;
   SoVRMLShape *myShape = new SoVRMLShape;
   SoVRMLCone *myCone = new SoVRMLCone;
   SoVRMLOrientationInterpolator *myOriInter = new
SoVRMLOrientationInterpolator;
   SoVRMLTransform *mytrans = new SoVRMLTransform;
   SoVRMLTimeSensor *myTimer = new SoVRMLTimeSensor;

   //refrence the root nodes
   root->ref();

   //set a light
   root->addChild(new SoVRMLDirectionalLight);

   //set a TimeSensor
   myTimer->cycleInterval.setValue(2.0);
   myTimer->loop.setValue(True);
   root->addChild(myTimer);

   //set a Transform nodes
   root->addChild(mytrans);

   //set a interpolater node
   const float val[]={0,1};
   myOriInter->key.setValues(0,2,val);
   const int numval = 3;
   static float axis[][3] = {{0,1,0},{0,1,0},{0,0,1}};
   static float angle[]  = {0, 3.14f, 3.14f};
   for (int i = 0; i < numval; i++)
          myOriInter->keyValue.set1Value( i,SbRotation(axis[i],angle[i]) );
   root->addChild(myOriInter);

   //connect myOriInter to mytrans and myTimer
SoDB::createRoute(myTimer,"fraction_changed",myOriInter,"set_fraction");
SoDB::createRoute(myOriInter,"value_changed",mytrans,"rotation_changed");

    //set Shape of an Object
   myMaterial->diffuseColor.setValue(1.0, 0.0, 0.0);   //Red
   myAppearance->material.setValue(myMaterial);
   myShape->appearance.setValue(myAppearance);
   myShape->geometry.setValue(myCone);
   root->addChild(myShape);

   // Create an Examiner Viewer in which to see our scene graph.
   SoXtExaminerViewer *myViewer =
            new SoXtExaminerViewer(myWindow);
   myViewer->setSceneGraph(root);
   myViewer->setTitle("Cone");
   myViewer->show();
   myViewer->viewAll();

   SoXt::show(myWindow);  // Display main window
   SoXt::mainLoop();      // Main Inventor event loop
}


--
*****************************************
Hiroshi akiba
University of Tsukuba
Computer Vision & Image Media LAB
TEL 090-2665-0049
E-mail: akiba@xxxxxxxxxxxxxxxxxxxxxxxx
******************************************