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I have three curved objects which I would like to render with a glossy surface. Unfortunately I can't figure out why my cycles render gives me these black areas. If I render the objects individually the black areas disappear so I assume its some kind of reflective interaction.

Would anyone mind explaining where I'm going wrong with this please? Any help would be very much appreciated. I'll try to link the .blend file if that would help.

enter image description here

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  • $\begingroup$ Is that image your render? Yes the blend would help in this case. $\endgroup$ – David Nov 12 '14 at 18:52
  • $\begingroup$ Hi, yes that is the render. Blend File $\endgroup$ – Andy Reed Nov 12 '14 at 18:54
  • $\begingroup$ What type of look are you going for on those objects? Just a solid color? $\endgroup$ – David Nov 12 '14 at 19:22
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OK I looked at your blend, and it was nothing more then the reflection of the shadow from the other objects.

First off I whent into edit mode, selected everything with A A, then on the tool shelf under the Shading/UV tab pressed the Recalculate button. Half of the normals were backwards.

The main thing I did was add a Diffuse node to your material, connected to a Mix Shader. The diffuse node gives the material a base color, regardless of reflections. Then mixed with the glossy node will add some reflections back to the material.
nodes
You really need something for the glossy shader to reflect off of, if you are going to get any reflections. A HDR is commonly used.

Modified blend

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  • $\begingroup$ Fantastic. Thank you for explaining. I notice you also changed the point light source for sun. I had originally wondered whether they might be shadows but I moved the point light source around and it seemed to make no difference. $\endgroup$ – Andy Reed Nov 12 '14 at 23:56
  • $\begingroup$ @AndyReed your lamp was not doing anything because the color of the world (white) was contributing nearly all of the light. $\endgroup$ – David Nov 13 '14 at 0:00
  • $\begingroup$ Ah, I see. That really does start to explain things. Thank you. $\endgroup$ – Andy Reed Nov 13 '14 at 0:19

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