I want to know if it's possible to simulate perspiration on a surface in cycles such as in the following images:
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? $\endgroup$– PGmathJul 9 '16 at 0:01
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$\begingroup$ 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. $\endgroup$– CarloJul 9 '16 at 0:02
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$\begingroup$ @PGmath : I'm open to both options. $\endgroup$– DS89Jul 9 '16 at 0:15
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$\begingroup$ @Carlo I'm talking about still images but I wouldn't mind learning about the animation method. $\endgroup$– DS89Jul 9 '16 at 0:19
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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.
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.
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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. $\endgroup$– DS89Jul 9 '16 at 0:32
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$\begingroup$ ten you'll have to enable Physics, so that they flow... Please include what you need as part of the question... $\endgroup$– user1853Jul 9 '16 at 0:34
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$\begingroup$ 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. $\endgroup$– DS89Jul 9 '16 at 0:44
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$\begingroup$ @cegaton great answer. Can the position or rotation of particles be randomized? $\endgroup$ Jul 9 '16 at 22:07
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1$\begingroup$ @fabriced yes, use the random, rotation and size control for the particles $\endgroup$– user1853Jul 9 '16 at 22:09