Click-drag any face to translate the dragger within the plane of that face. The face you selected will highlight in yellow. While you drag, yellow feedback arrows display the two directions of motion. Press the <Shift> key and the arrows turn orange; you may now pick between these two directions to constrain the motion. The direction you move the cursor in will determine which direction is chosen. Press the <Control> key and the dragger will translate perpendicular to that plane. The translation field is modified as the face is dragged.
Click a corner to scale the dragger. The corner you selected will turn yellow and radial lines will indicate that you may move toward and away from the center of the box. Drag radially and you will perform uniform scale. Press the <Control> key to scale about the opposite corner instead of the center of the box.
To stretch the dragger non-uniformly, press <Shift> when you drag the corner cube. Now you will see three orange arrows indicating that your gesture will determine which direction to choose. Move the cursor and the selected arrow will turn yellow while the others disappear. Now the dragger will stretch only in the direction you selected. Pressing <Control> at the same time as <Shift> allows you to stretch the dragger while keeping the opposite side pinned in place. When you drag a corner, this modifies the scaleFactor and possibly the translation field of the dragger.
Click one of the spherical knobs to rotate the dragger. When you first click, you'll see two orange lines and two purple circles. The purple circles indicate the two ways you can rotate. The orange lines are, once again, the two choices for your mouse gesture. Each line begins you moving around one of the two circles. Once you move the cursor far enough, the selected line turns yellow and you begin rotating the dragger about the selected circle. The other circle and line will disappear.
To perform unconstrained ("free") rotation, just press <Shift> while you drag the spherical knob. There will be no choices; instead all three purple circles will be displayed, forming a ball that you can roll around. Regardless of how you rotate, dragging the spherical knobs will modify the rotatation field of the dragger. Depending on how it is centered and what transforms precede it in the scene graph, rotation is likely to affect the translation and scaleFactor fields as well.
Pressing the <Control> key will change the center of rotation in both the constrained and unconstrained (<Shift>) case. By default, rotation occurs about the center of the bounding box. With <Control> depressed, rotation occurs about the middle of the opposite side of the bounding box. The purple feedback will change to illustrate this; the feedback circles increase in size and purple crosshairs sprout at the new rotational center.
SEE ALSO
SoTransformerDragger, SoTransformerManip
