Thank you very much for the answer.
But i have still the following problem:
I have 2 Points given and i have to draw an arrow between point1 to point2.
So i have tried to solve my problem with the lookAt method.
But it seems that i haven't implemented my arrow in a right way.
My sample code:
private Transform3D calculateRotationTransform3D(Vector3d source, Vector3d
target){
// source position
double x1 = source.x;
double y1 = source.y;
double z1 = source.z;
// target position
double x2 = target.x;
double y2 = target.y;
double z2 = target.z;
// arrow length
double len = Math.sqrt((x1-x2)*(x1-x2) + (y1-y2)*(y1-y2) + (z1-z2)*(z1-z2));
//middle of the two positions ( = position of arrow)
double x_middle = (x1+x2)/2;
double y_middle = (y1+y2)/2;
double z_middle = (z1+z2)/2;
//
Point3d eye = new Point3d(x_middle, y_middle, z_middle);
// calculate temp normal vector (cross product)<-- i dont know if this is right
Vector3d vec1 = new Vector3d(x1-x2, y1-y2, z1-z2);
Vector3d vec2 = new Vector3d(x1-x2, y1-y2, z1-z2-1.0); <-- ?? right?
Vector3d normalVec = new Vector3d();
normalVec.cross(vec1, vec2);
Vector3d temp = new Vector3d(normalVec);
temp.normalize();
temp.scale(len/2.0d);
Vector3d centerVec = new Vector3d();
centerVec.add(new Vector3d(x_middle, y_middle, z_middle));
//centerVec.add(temp);
normalVec.negate();
centerVec.add(normalVec);
Point3d center = new Point3d(centerVec.x, centerVec.y, centerVec.z);
// Vector3d v1 = new Vector3d(x1-x2, y1-y2, z1-z2);
Vector3d v1 = new Vector3d(x_middle-normalVec.x, y_middle-normalVec.y,
z_middle-normalVec.z);
Vector3d v2 = new Vector3d(x_middle-normalVec.x, y_middle-normalVec.y,
z_middle-normalVec.z-1.0d);
Vector3d normal = new Vector3d();
normal.cross(v1, v2);
Transform3D rot = new Transform3D();
rot.lookAt(eye, center, normal);
rot.invert();
return rot;
}
the call:
.
.
.
Transform3D caTransform = calculateRotationTransform3D(stPt, endPt);
TransformGroup caTransformGroup = new TransformGroup(caTransform);
Node cArrowCylinder = new Cylinder((float)ArrowDia, (float)CylenderLen,
caAppearance);
Transform3D caTransform = calculateRotationTransform3D(stPt, endPt);
TransformGroup caTransformGroup = new TransformGroup(caTransform);
.
.
.
Node cArrowCylinder = new Cylinder((float)ArrowDia, (float)CylenderLen,
caAppearance);
I would appreciate if you can verify or correct this code
Greets,
Horst Sueggel
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