#Water effects
14 messages in this thread
I'm looking for any suggestions on creating realisic ( or even close ) water
effects. My goal is to create underwater efffects of a rotor blade or somthing
similar passing through it. Any suggestions would be greatly appreciated.
Jonathon,
there's some interesting bubble ipas routines that have been released recently.
Very good for underwater scenes. Check the libraries for sample flics and/or
ordering details. Try your local dealer or Digimation 800-854-4496 for suitable
IPAS routines.
FWIW, I've created fairly realistic underwater effects as if a propeller is
passing through the water by using Yost's IPAS Spurt.axp in combination with
Digimation's Bubble.axp. For general underwater atmosphere, use combinations of
Yost's Water.sxp, Projector Lights with bitmap of water caustics, Fog, Blur,
and Snow.axp. Make sure to provide a backlight for the bubbles for better
effect. You might also put a animated map of water (or Water.sxp) on a
translucent plane placed directly in front of the camera, and look through it
for more turbulent atmosphere.
Hope this helps.
BILL
Wow! Thanks for the information. I would be interested in seeing a single
frame of your animation. I do have one initail question though. What do you
mean by water caustics? I don't have any experiece with IPAS. but I'll give it
a shot.
Thanks again.
Uh….caustics are reflective / refractive phenomena that occur when light
interacts with a material with those properties, in particular water. Let's
see…. have you ever noticed at a swimming pool, the shimmering light patterns
on the concrete sides of the pool, or on the bottom ? Caustics are the patterns
of light that appear due to light reflecting from a wind-peturbed curved
specular surface OR refracting through a non-homogeneous material. Another
example would be when light passes through a glass or chandelier, etc.. Besides
seeing shadows and reflections possibly, you also see the light patterns
produced which are caustics. They form because rays from a light source
converge AND diverge when interacing with objects in a given environment. In
rendering, can be considered a form of diffuse reflection, resulting in
patterns of light AND darker areas. When formed on second-hit surfaces (such as
the sides of the pool), are examples of specular-to-diffuse transport. Any
additional light propagation from a second to third or greater hit is purely
diffuse interaction.
That's about all I can say on the subject. Hope it helped more than confused
<g>.
BILL
That's what I thought.
Thanks
Thats all very nice, but pointless, becuase it doesnt help him out any.
So my one little tip is try using blue marble with may the – underwater
rocks/cliffs/formations. It give it a nice blue-rock effect, which gives the
eye a most realistic illusion of being underwater. You could also try playing
around with the fog.
-Jamie Kirschenbaum(Creative Director_)
Well……. I'm glad you straightened him out then.
Regards,
BILL
We think alike. I,m here scouting for the same kind of info. I want to learn
how to make a still or flick of a boat passing over head. I have made rewal
good boat models and I have a excellent five blade prop that you could use. But
I don,t know how to use my ipas modules yet. email me if you want to put or
resourses togeather. -Mike-
Thanks for the offer mike. I'm looking into this for a upcoming project
involing a paper fiber factory system. I don't have the IPAS either. Thanks
though
Jon'
Some maps I mentioned were based on a diamond-tiling (as in Queen of diamonds).
Among other things, that tiling emulates the wave pattern that follows a boat
moving slowly down a channel. The tiles are bounded by the diagonal waves
produced by the boat and by their reflection off the walls of the channel.
I've got my daughter to thank for that information. Last week she dragged me
kicking and screaming to see Shirley McLaine's new movie. I saw the pattern in
one of the first scenes.
Maybe something like that will work for your < boat passing over head>
A diamond-tiling for water is also used for "Wolf-Pack," at least for the
picture on the cover. (I think I called this software Wolfenstein when I
mentioned it about a week ago, sorry).
Ed K
Definitely check out Ed Kellerman's animator pro flics. He's got a lot of
awesome water bump map potential stuff, and I'm sure you guys could work out
something for a rotor-blade water bump map.
John Tissavary (La Luna cie)
Thansk for the sales pitch!
Ed K
If you are referring to the turbulence generated by the rotor blade, try
using a fractal pattern on a cone shaped object with a transparencey
falloff. Spin the object, and have it morph along the axis your prop is
moving to help create the illusion of a stream of turbulent bubbles being
pushed away. It might also help to add some velocity to your fractal
pattern along the same axis.
You can cheat the effects of cuastic refractions by applying an animated
bump map to your water surface that consists or a moving gray scale
pattern, and then ray trace your light through it. I generated my
grayscale images by crumpling up several sheets of paper, scaning in the
pattern, and then using a morph package to generate the transitions
between the sheets. This sequence was than used as my bump map, and it
worked quite well. Make your water surface blue and keep your light white
for best effect.
GT