Shawn Hargreaves Blog
I know I said I was going to write about transition effects, and I
promise I will, but I decided to talk about something else first, for
reasons that may later become apparent.
I'm a programmer. I cannot draw. Not even if my life depended on it. If you are in the same boat, read on...
the years I've been lucky enough to work alongside some incredibly
talented artists. I could never do what they do, but along the way I
picked up a few tricks that come in handy when you desperately need a
texture and there aren't any artists within reach.
I used some of these techniques while working on sample programs for the Creators Club website, so I'm going to talk about those here.
off, please note that only a few of the samples were faked using my
shoddy programmer art! I would never be able to make something as cool
as the dude in the Skinned Model sample, or the tank in Simple Animation, or the lizard in the Normal Mapping sample, or the grass and tree textures in the Billboard sample. We had real artists for those.
best way for a non-artist to create artwork is to dodge the whole issue
and not even try to draw anything. Get a camera. Find something cool.
Take a picture of it. Rinse, lather, repeat.
When I needed a reflection map for the CustomModelEffect sample, I just dropped in a copy of seattle.bmp,
a photo I took from the ferry that runs across Puget Sound to
Bainbridge Island. Quick, easy, and it looks far better than any kind
of random noise I could have tried to draw by hand.
photographs works best if you have access to interesting subject
material. I'm lucky because I love hiking and live in a part of the
world that is packed with amazing scenery, so I have lots of pictures
like glacier.jpg from the Sprite Effects sample (taken at Glacier Basin, high up on Mount Rainier).
make a great starting point for much more than just realistic
background images, though. Again in the Sprite Effects sample, I wanted
a noisy, rippling texture to use as a peturbation map for the Disappear
and Refract effects. In order to ripple the X and Y axes in different
directions, I wanted this to contain different patterns in the red and
green channels. Here is what I ended up using:
That texture started out as this photo of a waterfall,
from Spray Park (again on Mount Rainier). I selected a few interesting
areas of the original, arranged them next to each other, used the clone
stamp tool to paint over any rough edges, fiddled around until the
image tiled smoothly, and then slid the pixels in the green channel to
the bottom right, in order to make them different to the red.
really like the way this came out. It is basically just a noise
pattern, but gives an interestingly fluid, organic quality to the
effects which use it. Few people would ever be able to draw something
so complex and subtle, but this was easy to create using my camera and
a real waterfall.
So get your cameras out and get creative!
Realistic backdrops and skies are easy to photograph, but don't stop
there. Do you want trees? A brick wall? A field of grass full of
daisies? An alien spaceship? Ok, so you might not have a real spaceship
to photograph, but I bet you could make something interesting by
collaging together a close-up of the faucet from your bathroom sink,
part of your car engine, and the lid of a ball-point pen, using the
clone stamp tool, the smudge tool, and perhaps a few carefully selected
filters to hide the seams...
Coming up tomorrow: how to edit an
image so that it will tile seamlessly, and how to draw alpha channels
and normal maps over the top of existing pictures.
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