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I want to know if it's possible to simulate perspiration on a surface in cycles such as in the following images:

human perspiration

simulated orange perspiration

If so what techniques should be used?

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  • $\begingroup$ Usually this is done with a particle system. Are you specifically looking for a solution using just material shaders or are you open to a solution using particles? $\endgroup$
    – PGmath
    Commented Jul 9, 2016 at 0:01
  • $\begingroup$ Are we talking about animation or still images? I'll suggest to have a look at blenderguru.com/tutorials/how-to-make-a-rainy-window tutorial, if you hadn't already. $\endgroup$
    – Carlo
    Commented Jul 9, 2016 at 0:02
  • $\begingroup$ @PGmath : I'm open to both options. $\endgroup$
    – DS89
    Commented Jul 9, 2016 at 0:15
  • $\begingroup$ @Carlo I'm talking about still images but I wouldn't mind learning about the animation method. $\endgroup$
    – DS89
    Commented Jul 9, 2016 at 0:19

1 Answer 1

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On a separate layer create an object that will have the shape of your droplets, and give it the material you need.

enter image description here

Then on the main object add a particle system with start and end on frame 1, no physics and using the drop object as the render object.

enter image description here

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  • $\begingroup$ How about simulating trails that would come along with? I remember a technique that was demonstrated by Blender Guru, but he did it in the internal render at the time, not cycles. $\endgroup$
    – DS89
    Commented Jul 9, 2016 at 0:32
  • $\begingroup$ ten you'll have to enable Physics, so that they flow... Please include what you need as part of the question... $\endgroup$
    – user1853
    Commented Jul 9, 2016 at 0:34
  • $\begingroup$ I had just remembered that he used a uv unwrapped image as a factor in determining which part of the surface is completely glossy and and which is not. I believe that I know to do it that method since I have done it with eye reflections. Thank you for the particle suggestion though. $\endgroup$
    – DS89
    Commented Jul 9, 2016 at 0:44
  • $\begingroup$ @cegaton great answer. Can the position or rotation of particles be randomized? $\endgroup$ Commented Jul 9, 2016 at 22:07
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    $\begingroup$ @fabriced yes, use the random, rotation and size control for the particles $\endgroup$
    – user1853
    Commented Jul 9, 2016 at 22:09

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