With Cortona you can see and explore 3D worlds. Cortona will start automatically when you open a file containing a VRML world. There are two parts to the Cortona window.
Toolbars: The vertical toolbar, which contains buttons used to specify navigation type in a world. The horizontal toolbar, which contains buttons with predefined actions to change your position in a world. The 3D window shows the VRML world.
There is also pop-up menu, which you access by pressing and holding the mouse button while the pointer is over the 3D window.
Cortona offers three main navigation modes: WALK, FLY and STUDY. You can switch the navigation mode by clicking buttons on the vertical toolbar. Each navigation mode may have several options: PLAN, PAN, TURN and ROLL. The combination of navigation mode and an option determines the possible viewer motion and its orientation.
You can navigate with the mouse, the keyboard, or both mouse and keyboard. To move around a 3D world using the mouse:
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Choose a navigation mode.
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Position the pointer anywhere in the 3D window and press the mouse button.
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Move the mouse while holding down its button. The direction in which you drag the mouse determines the viewer motion.
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Release the mouse button to stop moving.
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You can control the viewer using keyboard commands. Please note that the following description of keyboard commands is presented for the PLAN navigation option.
| Arrow Up | move closer. |
| Arrow Down | move further away. |
| Arrow Right | turn to the right. |
| Arrow Left | turn to the left. |
| 8 on the numeric keypad | move closer. |
| 2 on the numeric keypad | move further away. |
| 6 on the numeric keypad | move to the right. If in the STUDY mode - this moves the viewer around the selected point or coordinate origin of the scene. |
| 4 on the numeric keypad | move to the left. If in the STUDY mode - this moves the viewer around the selected point or coordinate origin of the scene. |
| 7 on the numeric keypad | turn to the left. |
| 9 on the numeric keypad | turn to the right. |
| Plus on the numeric keypad | move up in the case of the FLY mode. |
| Minus on the numeric keypad | move down in the case of the FLY mode. |
| 1 on the alphanumeric keyboard | incline to the left. Note: This is not available in WALK mode. |
| 2 on the alphanumeric keyboard | incline to the right. Note: This is not available in WALK mode. |
| 3 on the alphanumeric keyboard | turn upward. If in the STUDY mode - this moves the viewer around
the selected point or coordinate origin of the scene. |
| 4 on the alphanumeric keyboard | turn downward. If in the STUDY mode - this moves the viewer
around the selected point or coordinate origin of the scene. |
| Page Down | next viewpoint. |
| Page Up | previous viewpoint. |
To accelerate viewer movement or rotation: Press SHIFT, CONTROL or SHIFT+CONTROL and one
of the navigation commands simultaneously.
The OPTION key enters PAN navigation mode.
The SPACE key enters TURN navigation mode.
The OPTION+SPACE combination enters ROLL navigation mode.
To activate a viewpoint do one of the following:
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Click the arrow buttons on the horizontal toolbar to move to the next or previous viewpoint.
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Press Page Down or the Page Down keyboard button to move to the next or previous viewpoint.
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Cortona provides three mechanisms that can help to re-orient a viewer if you
have lost your way in a world. Unlike the navigation tools, these buttons invoke predefined
actions that take place as you click on them.
Use RESTORE to automatically return to the loaded world's original active viewpoint.
Use FIT to make the scene view fully visible in the Cortona 3D window.
Use ALIGN to position the viewer's horizontal and longitudinal axes parallel to the scene's horizontal plane.
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