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To begin, I'm using a MacBook Air 13" early 2005 model. I cannot render high-quality images with ease. I can only render on the iMacs my school has allowed me to use. If samples/quality is a part of my problem (Below), please let me know, I just really don't want to do the render if it is going to give the same results. Thanks.

Problem: I have a scene where the camera is staring at leaves in trees. When I render, the images produce fine, but because I am wanting to use volumetrics and such, I have separated the scene into three layers.

  1. Close branches
  2. Tree canopy, volumetrics and a plane above creating a patchy effect in the light (Often used in ocean scenes to replicate light entering the water)
  3. Clouds (Volumetric)

When I have rendered a small strip at 512 samples (CPU), I noticed the z-Buffer has black dots scattered throughout. This is on both layer 1 and 2 (Above). Layer 3 was unaffected. Images: enter image description here enter image description here Image of effects on final composition (Combined layers) -- Note white dots due to Z-Buffer: enter image description here enter image description here FYI: The Leaves are made from a black and white texture, which is randomly coloured and bump mapped. They are then used as particles on the tree.

Could this be due to overlapping planes?

EDIT:

The blender file as requested enter link description here

Thanks again, BFB

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  • $\begingroup$ Could the scene be provided please? Does not look like overlapping to me btw. $\endgroup$ – Jan Matys Oct 28 '18 at 3:24

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