home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
Virtual Reality Homebrewer's Handbook
/
vr.iso
/
vscope
/
help2.scp
< prev
next >
Wrap
Text File
|
1996-03-19
|
9KB
|
193 lines
┌──────────┬──────────────────────────────────────────────┐
│ DynoView │ is the real time shaded option. It uses only │
├──────────┘ the 256 colour modes, and is only 284x181 │
│ pixels large. Use with a 4-view option to learn how to │
│ drive. │
└─────────────────────────────────────────────────────────┘
┌──────────┬──────────────────────────────────────────────┐
│ WalkThru │ Full Real-time wireframe view control. │
├──────────┘ │
│ Uses the resolution specified in the 'DRAW Mode'. │
└─────────────────────────────────────────────────────────┘
Toggle between "SHRINK/GROW" and "FORWARD/BACK"
By PUSHING the letter "D" on the keyboard.
┌──────────┬──────────────────────────────────────────────┐
│ Walk-3D │ Full STEREOSCOPIC view control. │
├──────────┘ │
│ 'W' is White background. │
│ 'B' is Black background. │
│ Check the reminder bar to see the effect of the mouse │
│ buttons. │
│ Below is a more detailed explanation. │
└─────────────────────────────────────────────────────────┘
USING THE "DYNOVIEW" OPTION
If DYNOVIEWing from a plan view, the first movement should
be to pull the mouse toward you. This orients the Z-axis
vertically. Horizontal mouse movement rotates the object
about its Z-axis. Vertical mouse movement rotates the
object about a horizontal axis. The effect is like having
the object surrounded by a glass sphere where the mouse
controls the direction that you travel around the sphere.
To exit the Dynoview mode press the space bar.
On exit, the image is zoomed to screen size.
If you get lost, use the RESET option on the MAIN menu
USING THE WALK-THRU COMMAND
═══════════════════════════
There are three wys of moving your viewpoint in
drawing space. These are the WALKTHRU and 3D-WALK
and DYNOVIEW options.
TERMINOLOGY
═══════════
VIEWPOINT -- The position of the eye in model space.
TARGET -- The point in model space toward which
the eye is looking. This appears in the
centre of the screen in the view.
FOCAL DISTANCE -- The distance from the eye to the target.
LENS SIZE -- Controls the included angle of the viewing
field. A lens size of 50 means that the view
is equivalent to looking through a 50 mm camera
lens.
MOVING IN MODEL SPACE
═════════════════════
Think of yourself as being in a machine that is moving around
in model space. The things you see do not move. You are the
only thing moving. You can only see the edges of the faces
and these do not make any sound as you crash through them.
Your only controls are the mouse and the keyboard.
PROBLEMS?
┌────────────────────────────────────────────────┐
│ A common mistake for beginners is │
│ trying to move toward an object when │
│ you are in SHRINK/GROW mode. │
│ If the object is beyond the target, you will │
│ continue to shrink down, making no forward │
│ progress. Finally you (your focal │
│ distance) will become so small that there seems│
│ to be no response to any for and aft mouse │
│ movement and no difference between 'looking' │
│ or 'swivelling' . │
│ The solution is to stay in │
│ SHRINK/GROW mode and continue to move the │
│ mouse back and back until you have a good │
│ response. │
└────────────────────────────────────────────────┘
USING 3D-WALK
══════════════
Put on the coloured glasses and click on 3D-WALK.
At the bottom of the screen are reminders of the action of each
mouse button. We start with the left button:
LEFT = LOOK
════════════
Holding the left button down and moving the mouse is like
swinging your head from side to side. Pushing the mouse
away from you is like looking up. As you look up the
screen seems to pass down. You can look left or right all
the way around behind you. As you move the mouse you are
"swinging" the target about your viewpoint. If you try to
look up and over to see behind you will experience
vertigo.(the image will spin around)
RIGHT = SWIVEL
═══════════════
Holding the right button down and moving the mouse is
"swivelling" yourself about the target. If all the objects
in the view are between you (your viewpoint) and the target
they seem to move opposite to the mouse. Conversely, if
the objects are behind the target they will appear to move
with the mouse. If you have just come into the 3D-WALK
mode from the DYNOVIEW option the target should be in the
middle of the points. In this case you will be able to see
that the invisible target point is the point about which
the objects appear to move. Do not forget that it is your
viewpoint that is moving, not the objects.
It is possible to move the viewpoint and the target to any
point in the drawing by using only the swivel and swing
motions although this is not easy in practice. Sideways
motion can be achieved by alternately swinging the target
and then swivelling about the target in the same
direction. This is referred to as "crabbing".
BOTH = SHRINK/GROW
═════════════════════
Holding down both mouse buttons and moving the mouse for
and aft moves you (your viewpoint) toward the target.
Side to side mouse movement moves the target left to right
as in the swing mode. The target does not move in space
away from you or toward you. You move toward or away from
the target. This means that the FOCAL DISTANCE changes.
All movements in space are proportional to this distance.
If you push the mouse forward it looks as if you are moving
forward. You are, but you will never get to the target or
to any of the things behind the target. The
"shrink/grow" mode in the 3D-WALK option is the only way
to change the focal distance.
____________________________________________________
WHY MAKE IT SO COMPLICATED?
It's really not so bad. Say you are cruising around in a
model of a city. You would want to move about quickly in
the streets or fly up to the top of a building but you
would also like to see the detail in some corner of some
shop (say a watchmaker's shop). By shrinking down you can
go inside the watches and move about with natural motion.
The other reason for this "shrink/grow" function is that
with the 3D-glasses the 3D effect is only useful when the
objects under consideration are close to the plane of the
screen which contains the target point. You can easily
'zoom' in on an object and it will stay near the plane of
the screen.
Toggle between "SHRINK/GROW" and "FORWARD/BACK"
By PUSHING the letter "D" on the keyboard.
BOTH = FORWARD/BACK
════════════════════
Hold both mouse buttons down and move the mouse for and
aft. This moves viewpoint and the target for and aft.
This is the preferred method for moving the target and
the plane of the screen to the object of interest. If you
have lost the stereo effect because of too much image
separation move for and aft until both images match. You
can steer left or right as you move as in the left button
"swing" mode.
Use the 4-VIEW command in the ZOOM box to see where your
viewing fulcrum is located. The base of this pyramid is the
screen and the centre of the base is the target location.
NOTE: The cardboard glasses provided with the demonstration
Program are not like the glasses provided with the full
version of VeriScope. You will see ghosting of the images.
This ghosting or crosstalk is corrected when using the
standard VeriScope glasses.
ADJUSTING THE STEREO EFFECT.
The stereo viewing can seem a little frustrating at first. Here
are a few hints to get you started.
* Keep the part you wish to see in the plane of the
screen.
* Use the left button to swing back and forth around
the object.