If his lkights are causing the difference in results then that might be a solution as the settings he has on them effectively turns them off as far as scene lighting.  The other difference could be from the raytrace bounces. His is 1 yours is 2 *

 

*disclaimer -  I have no idea why either of these things would be the difference just that they are different in the two setups

 

Quote - > Quote - I haven't been able to reproduce your issue, moriador, although my largest render was 3000px. Will try a bigger one, but in case I'm missing something, this is what I've got in my scene and render setup:

SCENE ELEMENTS

BB's EnvSphere

1 - one sided square primitive set to 3 ambient.

1 - displaced ball primitive with SSS applied.

(2 lights with diffuse and specular set to black)

RENDER SETTINGS

I haven't delved into D3D's advanced render Firefly GUI. In the regular render settings:

Casts shadows, SSS, Raytracing all checked; Use displacement on.

Raytrace bounces: 1

IC: 50

Indirect Light: Quality: 10

Pixel samples: 4

Min shading rate: 0.4

Min discplacement bounds: 0

Gamma correction: 2.20

Post filter: box / 1

Am I missing anything?

No lights in my scene. Turn yours off? Also, I've been rendering with indirect light quality of at least 50. Below that, there's too much mottling from the emitters to be any use in a real scene anyway. With the primitive, I'm seeing the artifact even on smaller renders.