View Full Version : Water Physics

04-08-2013, 11:46 AM

04-08-2013, 12:06 PM
the Water ripple looks kinda unnatural, it lacks of ease, especially when the particles fall, also the splash should last longer, Anyway, nice background and usage of texture, i enjoyed it overall.

(Yea, idgaf if he didn't asked for CnC)

04-08-2013, 12:54 PM
Pretty cool I wish I could do stuff like this!

04-08-2013, 06:51 PM
So for starters, you've got the basics wrong.
I assume you were aiming for realistic. In which case, you failed awfully. You've got the physics wrong. Just focus your eye on the droplets that jump left. The parabola/arc they describe has the bases too far away. Taking the first base where the object drops, the second base where the droplet falls, these 2 bases have way to much space in-between. Making it look unrealistic and just plain wrong, because there are other droplets in which you got it right, making the contrast even clearer.
There were also some cases in which the bases were to close together, suggesting a secondary force like wind that would be affecting all of these droplets, however, other droplets did not appear to be affected by this wind force.
The sum of [bases too close + bases too far away + bases that were right] gave it an awful overlook.

Now, lets watch some footage!
Here's a slowmo version of a droplet falling in the Y axis, that means, straight down.
You can see that the first thing that happens when the droplet touches the surface its an exaggerated wave that ends up forming a ring-wall thingy. I'll call it ring.
The ring is, like I said, an exaggerated version of the small waves, and as soon as it forms, it starts dividing in 2 parts.
The droplets and the "come-back-ring".
Force distributes unevenly on the ring, meaning some parts of the top of the ring wont become droplets, and some of them will not only become droplets and separate from the original ring, but they will reach different heights than others.
And the "come-back-ring", I'm just calling it that because it doesn't have a name. Anyways, not all of the ring becomes droplets, the parts than are closer to the surface, or don't have the force to separate from the original ring, simply go back to the surface, which is why I called it "come-back-ring"
While you animated the droplets that come out of the ring, you did not even add a hint of the "come-back-ring" thing, which made it look like the ring suddenly disappears, cause you had the ring for like 4 or 5 frames, and then in 1 or 2 frames no more ring, there's even a really big droplet in the middle that disappears without trace.
Watch out for that.
Also, the waves that come out of the island should have the same shape as that of island's perimeter that touches the water, but I'm guessing that was just you being lazy.

If you are still not clear with parabolas and arcs, I'll leave you with an explanation of it from wikipedia (http://en.wikipedia.org/wiki/12_basic_principles_of_animation#Arcs).
Even if it doesn't look like it, I'm trying to help you.
For more indepth criticism, visit the SPTT thread (http://forums.stickpage.com/showthread.php?54850-Stickpage-s-Tutorial-Team).
Water is a hard thing to get right if you aim for realism, but keep at it!
Hope I was clear enough, if something was not clear, let me know.