Here is my attempt at dropping things into water. Unfortunately it did not turn to out well especially at the bottom right and this is at 900 cycles. Are there any ways apart from increasing the cycles to make it look better? I mostly want to fix the colored spots from the above the lemon.

enter image description here

  • Could it be that you accidentally assigned another texture to the lemon with default color? – stacker Dec 9 '13 at 5:54
  • @stacker the lemon color is fine but how do I get rid of that thing in the bottom right. it is still there at 2000 cycles – Qwertie Dec 9 '13 at 6:43
  • referring to the pink spots? that's just an image texture looking without an actual file value (you haven't chosen the image) – Greg Zaal Dec 10 '13 at 18:58
up vote 4 down vote accepted

I'm not entirely sure what part of your render you are asking about, but here are some possibilities:

enter image description here

  1. This appears to be caused by internal reflection of a light source (judging from the lighting, I would say the light source is behind the camera and a little to the left). Try adjusting the lighting in your scene and see if it improves.

  2. The fluid simulation appears to be rendered at a low resolution. Try baking at a higher resolution (e.g. start with 100). If you did bake at high resolution, ensure that the Render display option is set to Final.

  3. It's hard to say what's causing this without looking at your file, but a couple of possibilities are:

    • The geometry of the orange mesh. Ensure that the normals in that area are facing the right way, check for overlapping faces, ensure that there are no holes in the mesh, etc.

    • Bounces. Try increasing the number of Bounces in Render settings > Light paths (A fast way to increase all bounce related settings is with the presets, try the Full Global Illumination preset). This will increase the overall accuracy of the render as well, so you probably want to increase them anyway. Note that more bounces will slow down your render.

  4. To help decrease fireflies, see this question. Some techniques mentioned there are:

See the manual page on reducing noise.

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