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Under the Render Properties tab there is a setting to change the seed used for ray tracing. Is there a way to use different seeds on different render layers?

seed setting in the sampling section of the render tab of the properties window

I know this is possible using multiple scenes instead of render layers and linking objects, but that is pretty cumbersome.

David
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PGmath
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    How about driving it with single property ID object 'Scene' data_path render.layers.active_index gives a different value depending on which renderlayer is active – batFINGER Nov 21 '15 at 11:24
  • @batFINGER I tried putting #render.layers.active_index in the seed box, but the seed seems to be the same for the two layers. – PGmath Nov 21 '15 at 15:48
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    @batFINGER active_index seems to be the selected render layer, not the one currently rendering. – PGmath Nov 21 '15 at 15:54
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    In conjunction with http://blender.stackexchange.com/questions/8863/how-do-i-render-specific-render-layers-using-python write script to render layers individually with differing seed values set for each. – batFINGER Nov 21 '15 at 16:47

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You can make a full copy of the scene into another and select other seed in it. You are gonna need a new scene for every diferent seed. Them, in compositing you can select scenes and layers in the render nodes.

Juae Martin
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