"Mr" <nomail@nomail> wrote:
> Excellent, would it be possible to get an idea of your settings and rendertime
> for a frame?
> I have many troubles to find acceptable settings for caustics.

I used pretty high radiosity settings, an area light, EXR environment, and focal
blur (mostly for antialiasing) and was getting a render time of ~4min/frame
@1280x720px on my i7 with 8 render threads, but here is the bare bones scene
code for just the aqua water box:

#version 3.7

background { rgb 0.5 }

global_settings {
   assumed_gamma 1
   max_trace_level 20
   radiosity {
      //...
   }
   photons { spacing 0.02 }
}

camera {
   location vnormalize(<-6, 8, -9>)*100
   look_at <-20, 10, 0>
   right x*image_width/image_height
   angle 55
   rotate <0, 20, 0>
}

light_source { <20, 30, 15> rgb 1
   area_light <1, 0, 0>, <0, 0, 1>, 6, 6
   orient
   circular
   area_illumination on
   fade_distance 20
   fade_power 2
}

// floor
plane { y, 0 hollow pigment { srgb <236,220,196>/255 } }

// aqua box
box { -0.5, 0.5
   scale <10, 20, 5>
   rotate <110, 90, 0>
   translate <10, 15, 17>
   texture {
      pigment { rgbt 1 }
      normal {
         bozo
         scale 1
         turbulence 0.5
         bump_size 2
      }
      finish { specular 0.2 roughness 0.2
         reflection { 0, 1 fresnel on } conserve_energy }
   }
   interior { ior 1.33
      fade_color srgb <223,248,255>/255
      fade_power 1001
      fade_distance 1
   }
   photons {
      target
      refraction on
      reflection on
      collect    on
   }
}

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