[JAVA3D] How to rotate a transform3D in a given direction

[Nitin.Jain]

Hi,

I have a plane defined by four points which is normal to x-axis. I have a
line defined by two arbitrary points, eg. (x1,y1,z1) and (x2,y2,z2) now, I
want to transform the plane in such a way that it becomes normal to the new
line and is positioned at the first point of the line.

Can the lookAt method of Transform3D be used for this.

The code I'm using for rotation and translation is given below:

Thanks for the help,
nitin

/******

//points on plane
Point3f vertex1 = new Point3f(0,-theWidth/2,theThickness/2);
Point3f vertex2 = new Point3f(0,-theWidth/2,-theThickness /2);
Point3f vertex3 = new Point3f(0,theWidth/2,-theThickness/2);
Point3f vertex4 = new Point3f(0,theWidth/2,theThickness/2);


Vector3f  line  = new Vector3f(x2-x1, y2-y1,z2 - z1);
line.normalize();

Transform3D  aTransForm3dRotateY = new Transform3D();
Transform3D  aTransForm3dRotateZ = new Transform3D();

//trying to find the angle direction
double SignFactorY = line.y/Math.abs(line.y );
double SignFactorX = line.x/Math.abs(line.x );

//Rotation along Y-axis is equal to the angle formed be the line with the
z-axis
aTransForm3dRotateY.rotY(SignFactorX*Math.acos(line.z));

//Rotation along Z-axis is equal to the angle formed be the line with the
x-axis
aTransForm3dRotateZ.rotZ(SignFactorY * Math.acos(line.x));

aTransForm3dRotateY.mul(aTransForm3dRotateY,aTransForm3dRotateZ);


Transform3D  aTransForm3dTranslate = new Transform3D();
aTransForm3dTranslate.setTranslation(new Vector3f(x1,y1,z1) );

aTransForm3dRotateY.transform(vertex1);
aTransForm3dRotateY.transform(vertex2);
aTransForm3dRotateY.transform(vertex3);
aTransForm3dRotateY.transform(vertex4);

aTransForm3dTranslate.transform(vertex1);
aTransForm3dTranslate.transform(vertex2);
aTransForm3dTranslate.transform(vertex3);
aTransForm3dTranslate.transform(vertex4);

*********/

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