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- V i r t u a l M o v e m e n t
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- By Lee Bamber
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- Always keen to share new found talent within the deepest reaches of that big
- cloud of dust that is my brain, an idea to spur the imagination of thousands
- of virtual people.
-
- This month, October 1994, I and the collective that is Digital Ninja aquired
- a rather nifty piece of hardware called a Video Digitiser. It's called the
- Vidi-Amiga(12) and I payed £80 for it. (Yes, I know it's cheaper mail order
- but I'm not very patient). What it does is take an image from a video input
- and converts it to an image the computer can use (typically an IFF file!).
- My Digitiser supports a large array of graphic modes including 256 colour &
- even HAM8(lots of colours...trust me). These images can be messed about and
- used in my games, at least, that's the idea I had when I bought it.
-
- How strange that no-one has really made an attempt to use digitised graphics
- in PD, I thought? You can pick up a digitiser for less than fifty quid? I
- wonder why? You won't be suprised that I soon found out why. Essentially,
- the digitiser does it's job well. I have a small directory of images, both
- original and insanely altered versions. Cut out the bits you want and put
- them in your games and they look AWFUL! It's bad enough looking at the grey
- scale images over coloured backdrops, but the edges are so obvious, you just
- cringe at the crude misplaced spectacle.
-
- So what now. Do what I suppose everyone else did and left it for the funny
- grab now and again, until it gathers dust in some corner? Well, no. I do
- not have much money and £80 represents about 3-4 months royalties, so a week
- into playing with it, I fine tuned my methods until I got something usable.
-
- So what's this article about (apart from Lee endulging his new purchase)? I
- have drummed up a neat way of making your digitised characters move fluidly.
-
- NOTE: Did I forget to mention I have access to a camcorder. Just bought the
- summer last. I was going to use a £40 security camera (b/w), but never got
- round to it, when my parents came home one day with the damn thing. After a
- week of novelty camera tricks and film-making, it went in the case and was
- forgotten by all, bar me.
-
- I tried outside shots, still life, the lot. Eventually, I found myself with
- a recently gutted spare room, three spot lights, a blank wall and darkness.
- With the help of a brother, an uncle and a few friends, we tried some grabs
- of actual movement. The Vidi-Amiga has a continuous grab function which got
- a string of frames with an action being performed. When we got them to
- DPaint, cut them up, saved them as images and animated them in AMOS, the
- graphics looked crude (like I said).
-
- One solution to the very disjointed animation was to totally dispense with
- the hassle of grabbing all the individual frames of animation and have just
- two. A starting anim, and a finishing animation. Using the marvelous DP4,
- six morphed frames where generated from the two sources. That's six frames
- showing the image morph from one image to the other. And why? Well, the
- main problem with digitised graphics is they look VERY real. They look too
- real for most peoples eyes. If the background doesn't reflect the same rate
- of detail, it looks wrong. And it's not sensible to have real background,
- shadows, reflections, other subtle animations and all the things you would
- for example find on a TV screen. Not in real-time anyway (least, not yet).
- So what this morph process does is make the character movement look smoother
- than any hand-drawn image, and brings it in line with what you're expecting.
- Real movement. The final morphed animation is very very smooth and totally
- beleivable. As long as the two images are not too different, and you make
- sure the two grabbed images are the same size (very important), the output
- is very useful.
-
- I've supplied a small demonstration brush which you can load into any DPaint
- that supports animation. Just set up an animation with six frames and then
- load in the anim-brush, plot them into the six respective frames and play it
- using the '6' key (Ping-pong gives you the best idea behind the technique).
-
- Maybe my topic is rather specific, but even when I had an A500 with no
- second drive, I knew I would be getting myself a digitiser and a means to
- grin into my computer one day. Maybe now isn't the time to use this article
- but it gives you something to look forward to. Or warns you against making
- more work for yourself.
-
- I forsee I'll be in DPaint just as long as I was when I was hand-drawing my
- images. Not to draw the stuff, but correcting it! The digitiser is great in
- snapping a picture of your favourate TV show, but using it for game images
- is going to be tough. If I know me, I'll have this digitising lark sussed
- in no time. And then you better prepare yourself for an onslaught of rather
- uncomfortably real graphics, hitting your screen.
-
- Prepare Yourself, Now The Ninja Can Grab!
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