Rotation of slices

To rotate a slice, make sure the Slice Alignment Tool   is selected in the Toolbar. BioVis3D provides a rotation control, shown in Figure 1, comprised of a center of rotation and four dragging points.

Figure 1: Rotation control.

In order to make a rotation, select a position for the rotation center and then drag any of the dragging points to actually rotate the slice. To move the rotation center, place the mouse cursor on the center. The  mouse cursor changes from  to . Click on the center and keep the left button pressed while moving the mouse to drag the center to the desired position (see Figure 2). Once you are satisfied with the center position release the mouse button. Alternatively, right click on the desired position and select Place Rotation Center Here from the context menu.  

 

Figure 2: Dragging of the rotation center.

To rotate the slice, place the mouse cursor on any of the dragging points of the rotation control. The mouse cursor changes from  to . Click on the dragging point, (the mouse cursor changes to  ) and keep the left button pressed while moving the mouse to rotate the slice (see Figure 3). Once you are satisfied with the slice position release the mouse button.  

Tip: To be more precise, move the mouse away from the rotation center before releasing the mouse button. This way, small rotations are achieved with relatively large mouse movements.  

Instead of using the mouse, you can also make small rotations by using the arrow keys while keeping Ctrl pressed (Ctrl-Arrow Key).

Figure 3: Rotation of a slice.

This tool is usually used in combination with the Transparency and Translation tools.