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What's the cause of the weird, checkerboarding on the purple spheres and how do I remove it?

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  • $\begingroup$ What exactly do you mean with "ray-tracing" enabled? Are you using Cycles, Eevee or Blender Internal? Do you have a texture applied? $\endgroup$ – Robert Gützkow♦ Jul 19 '19 at 10:28
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    $\begingroup$ can you include the blend file, as of right now you question is ununderstandable $\endgroup$ – DrachenSeele Jul 19 '19 at 11:26
  • $\begingroup$ @rjg Sorry, sort of floundering around here. 1) When the ray-tracing checkbox in the shading panel is checked. 2) Blender Internal. 3) No texture applied. Thanks for your help $\endgroup$ – jo416 Jul 19 '19 at 11:44
  • $\begingroup$ @DrachenSeele sorry, added it now. Thanks! $\endgroup$ – jo416 Jul 19 '19 at 11:53
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This is caused by z-fighting in overlaping surfaces. Remove double geometry to resolve it.

enter image description here

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