Silly Rotation Key Question

[Anonymous]

Hola Folks,

I am using 3DSM 8. I am not using IGame (nor do I intend to). I have played with various conversion methods available in the SDK. None of the values appear to be correct. I am not sure if I am doing something incorrectly or not.

I would like to know the best way of getting the angle of rotation in degrees from a rotation key.

The objective is to create a description file that shows the time (seconds, ticks and frame) of a rotation key, the axis of rotation and the angle / amount of rotation in degrees. It does not help the reader of the file to see angle axis values or quaternion values.

The method I am using is shown below.

From the declaration section:

int i, numKeys;
Control* oControl;
Quat newQuat, prevQuat;
IKeyControl *ikeys;
ITCBRotKey tcbRotKey;
RotationValue oRotVal;
Point3 p3;

A snippet from the method that extracts the data from the key:

    // --- Process the rotation keys ---
    // Get the rotation controller
    oControl = oNode->GetTMController()->GetRotationController();

    // Get the key controller from the rotation controller
    ikeys = GetKeyControlInterface(oControl);

    if (!ikeys)
    {
        LogToFile(pObjLogStream, true, "@info", "KeyTest.", "Rotation Key. No rotation keys are available.");
    } else {
        // Get the number of rotation keys
        numKeys = ikeys->GetNumKeys();
        bRez += numKeys;

        sprintf(sTmp1, "%d rotation key(s).", numKeys);
        LogToFile(pObjLogStream, true, "Rotation Key Count", sTmp1);

        if (oControl->ClassID() == Class_ID(TCBINTERP_ROTATION_CLASS_ID, 0))
        {
            for (i = 0; i < numKeys; i++)
            {
                ikeys->GetKey(i, &tcbRotKey);
                
                lTimePosSeconds = lTimePosTicks / (float)TIME_TICKSPERSEC;
                newQuat = QFromAngAxis(tcbRotKey.val.angle, tcbRotKey.val.axis);
                if (i>0) {
                    newQuat = prevQuat * newQuat;
                }
// Quick Test
AngAxis rval;
rval = AngAxis(newQuat/prevQuat);
// End Quick Test
                prevQuat = newQuat;

                // Write the key data
                fprintf(pObjAnimStream, "\t\t%i %.6f %.6f %.6f %.6f\n",
                    lTimePosSeconds,
                    newQuat.x, newQuat.y, newQuat.z, newQuat.w
                    );

// Write Test Output Data
fprintf(pObjAnimStream, "#\t\t%i %.6f %.6f %.6f %.6f\n",
    lTimePosSeconds,
    tcbRotKey.val.axis.x, tcbRotKey.val.axis.y, tcbRotKey.val.axis.z, tcbRotKey.val.angle
);

oRotVal.Set(newQuat);
p3 = oRotVal.Euler();
fprintf(pObjAnimStream, "#\t\tP3: %.6f %.6f %.6f\n",
    lTimePosSeconds,
    p3.x, p3.y, p3.z
);

fprintf(pObjAnimStream, "#\t\tRVal: %.6f %.6f %.6f %.6f\n",
    rval.angle, rval.axis.x, rval.axis.y, rval.axis.z
);

float fAngle = 0.0f;
QuatToEuler(newQuat, &fAngle);
fprintf(pObjAnimStream, "#\t\tfAngle: %f\n",  fAngle);

            }

        } else if (oControl->ClassID() == Class_ID(HYBRIDINTERP_ROTATION_CLASS_ID, 0)) {
            ...
        } else if (oControl->ClassID() == Class_ID(LININTERP_ROTATION_CLASS_ID, 0)) {
            ...
        } else {
            ...
        }
    }

Thank You



-isdi-

[Anonymous]

Hola Folks,

I have just gone ahead and performed the calculations.

I had hoped that someone would be able to point out a function or macro provided by the SDK or from 3DSM directly. This would minimize errors.


-isdi-