The direction in which you drag the mouse from the point where you depressed the button determines the direction in which you move. If you change the direction you're dragging, the direction you're moving will change, too.
The distance that you drag the mouse determines the speed with which you move. If you stop moving the mouse, you'll continue moving at a constant speed until you release the mouse button.
When you select a navigation type from the vertical toolbar, your cursor will change to a shape that is similar to the icon on the toolbar. Both the toolbar icon and cursor are shown here.
Use Walk to move forward and backward along a single horizontal plane. To move forward, click the mouse button and drag straight up, toward the top of the screen. To move backward, click and drag straight down, toward the bottom of the screen.
If you click and drag upward toward the left or right, you'll move forward at an angle; if you click and drag downward to the left or right, you'll move backward at an angle.
Use Pan to move up, down, left, or right within a single vertical plane. Drag straight up to move upward, drag to the left to move left. If you drag on an angle, you'll move along the same angle.
It's important to remember that you'll move in the same direction in which you drag the mouse, which means that the world will appear to move in the opposite direction.
Use Turn to change the angle of your view. Unlike real life, you can turn upward, downward, and other angles, in additon to left and right. To turn right, drag the mouse directly to the right. To turn downward, drag the mouse directly downward. As with Pan, you move in the same direction as the mouse, the world will appear to move in the opposite direction.
Dragging in any direction will cause you to turn in that direction. This can be confusing at first -- you might, for example, end up with the floor rotating toward you at a 45-degree angle, which isn't something you're used to in real life. Until you're accustomed to it, you might want to drag the mouse directly up, down, left or right, rather than at an angle (the arrow keys are especially useful for this). If you've already turned at an odd angle and are now disoriented, read Getting Your Bearings.
Use Roll to rotate either clockwise or counterclockwise within a single vertical plane. Drag the mouse to the right to rotate clockwise; drag to the left to rotate counterclockwise. Unlike other types of navigation, vertical movement of the mouse has no effect with Roll.
Examining Objects: Goto and Study
Goto and Study are Microsoft VRML 2.0 Viewer navigation types specifically designed to help you examine individual objects within a scene.
Use Goto to choose an object in a scene to move to. When you select the Goto icon on the toolbar, the cursor changes to a crosshair. Click on an object in the world and you'll move directly to it. If you decide after selecting Goto that you don't want to move, press the Esc key or simply click on the background in the world rather than an object.
The way Goto works depends on the way a world was authored, so there can be situations where Goto doesn't work as you expect. Goto will always center the object you choose on the screen. However, it's sometimes hard for you to tell how large an object is. For example, if you click on an interesting piece of architecture that turns out to be part of a single large building object, Goto will zoom your view out so that you can see the whole building, rather than just the detail you're interested in. If this happens, use another type of navigation to move close to the detail you'd like to examine.
Keyboard navigation is supported as follows:
Arrow keys navigate (for example, during WALK mode; up=forward, down=backwards, left & right=themselves).
PAGE UP/PAGE DOWN keys toggle you through defined viewpoints.
To change navigation modes, press CTRL+SHIFT and one of the following keys:
W = WALK mode
P = PAN mode
T = TURN mode
R = ROLL mode
G = GOTO mode
S = STUDY mode
U = STRAIGHTEN UP scene
Z = ZOOM OUT from scene