Scene Graph Implementation for Web-Based 3D Experiment - Interactive Web-Based Virtual Reality with Java 3D - page 348

spotlight = new SpotLight(lighton, spotlightColor, position, attenuation,
lightDirection, spreadangle, concentration);
spotlight.setInfluencingBounds(bounds);
branchRoot.addChild(spotlight);

return branchRoot;
}

e.9 rotatInG a transform Group by a specIfIc
anGle relatIve to Z-axIs

private void setRotationZ(TransformGroup Trans, float angle)
{

Matrix3d rotMat = new Matrix3d();

Transform3D rt3d = new Transform3D();

Trans.getTransform(rt3d);

rt3d.getRotationScale(rotMat);

rotMat.m00 = Math.cos(angle);

rotMat.m11 = rotMat.m00;

rotMat.m10 = Math.sin(angle);

rotMat.m01 = -rotMat.m10;

rt3d.setRotation(rotMat);

Trans.setTransform(rt3d);

}

e.10 movInG a transform Group to specIfIc poInt

private void setPosition(TransformGroup Trans, Point3f point)
{

Transform3D t3d = new Transform3D();

Trans.getTransform(t3d);

t3d.setTranslation(new Vector3d(point));

Trans.setTransform(t3d);

}

e.11 scalInG a trnasform Group WIth specIfIc
value

private void setScality(TransformGroup Trans, float scalevalue)
{

Transform3D t3d = new Transform3D();