• Boris FX Particle Illusion

  Water Ripples Interacting

  Posted by Matt Grunau on August 12, 2008 at 2:27 am

  Is it possible to have water ripples react to one another when they collide? I am trying to do a Matrix/Independance Day type shield effect, and the results look good with regular ripples as a displacement and compound blurs, but if they reacted with each other the effect would be much more convincing.

  Any ideas?

  Thanks,

  Matt

  Matt Grunau replied 17 years, 9 months ago 2 Members · 2 Replies
• 2 Replies

• 

  Alan Lorence

  August 12, 2008 at 8:21 pm

  Not in particleIllusion — there are no interparticle collisions.

  If you’re generating essentially cocentric rings which you then use as your displacement map, if you keep the range of colors (greyscale) at 50% max, then when you combine ripples, you’ll get the interference patterns you want.

  So instead of rendering ripples that go full white on black, make them go to 50% (grey) instead, so when you add 2 of these ripple images on top of each other, you’ll get some areas that add up to full white.

  Does that make sense?

  Alan.

  http://www.wondertouch.com
• 

  Matt Grunau

  August 12, 2008 at 9:37 pm

  That makes perfect sense, on small hitch would be that when you create a displacement map or compound blurs (I’m using AE) the background color needs to be 128,128,128. I could do alphas, but I can never get the nice defined edges that I see in PI.

  Actually, I know exactly what I will do, I’ll make them exactly as you suggested, but against a black background, and then in AE, simply use Knoll Unmult, the best free plugin ever made. Then it’s a simple precomp and it’s done.

  Thanks Alan.

Reply to this Discussion! Login or Sign Up