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enter image description hereHello,

The blender render does give color but not the cycle. How could this be? Is it maybe because of my GPU? (wich i cant select as compute device)

enter image description here

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  • $\begingroup$ I do have RGBA checked in the output section.. $\endgroup$
    – Sjors
    Jan 31, 2016 at 14:04
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    $\begingroup$ Did you set up your materials for cycles? Materials for blender internal can't be used when rendering on cycles. $\endgroup$
    – user1853
    Jan 31, 2016 at 14:07
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    $\begingroup$ related: blender.stackexchange.com/questions/364/… $\endgroup$
    – user1853
    Jan 31, 2016 at 14:10

4 Answers 4

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First of all: using CPU or GPU would not make any difference on the characteristics of the rendered image, other than rendering faster or slower.

I see three possible reasons why you have a black and white image:

  1. You set up materials in blender internal and didn't create materials for cycles.

    When no materials are present cycles will render everything with the default material, which is gray.

Cycles and Blender internal's materials are not compatible or interchangeable. you need to create new ones them using material nodes.

  1. Maybe you did set materials but you set the output to render as B&W. Set it to RGB or RGBA (Red, Green, Blue, Alpha)

    enter image description here

  2. Maybe you did set the materials correctly and the output to RGB (or RGBA), but you set the render layer to use only one material, overriding all of the other materials for the scene:

    enter image description here

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  • $\begingroup$ Ah oke. i did not set specific matterials for cycles. Thanks for the quick and complete answer. $\endgroup$
    – Sjors
    Jan 31, 2016 at 16:00
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As Cegaton pointed out, this happens, when you update a scene from blender internal to cycles.

All materials are lost and replaced by a placeholder material that renders gray.

Just go to material tab and start creating new materials.

Edit: I have to correct myself: It is not the case, at least diffuse color is transfered.

Here is a simple scene in blender internal

Internal render with simple materials

Same in cycles

Same in cycles

And here is a screenshot of material tab after changing to cycles. Screenshot of material tab after changing to cycles

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    $\begingroup$ Thanks for the quick response.. But even in the preview the matterials are gray (and when i select a colered one it turns gray).. Sorry if its a dumb question. $\endgroup$
    – Sjors
    Jan 31, 2016 at 16:08
  • $\begingroup$ Please upload some screenshots. Material tab with the object selected. Render and Render Layer-Tab would also be helpful. $\endgroup$
    – maegmaeg
    Jan 31, 2016 at 16:10
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    $\begingroup$ Does that screenshot tell anything? $\endgroup$
    – Sjors
    Jan 31, 2016 at 16:27
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    $\begingroup$ Guys... this is not a forum but a question and answer site. Conversations like this should go to chat $\endgroup$
    – user1853
    Jan 31, 2016 at 17:12
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    $\begingroup$ please read: blender.stackexchange.com/tour $\endgroup$
    – user1853
    Jan 31, 2016 at 17:14
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The main problem seems to be missing material nodes in Cycles. I'll suggest reading the Blender Manual for materials and nodes in Cycles here: https://www.blender.org/manual/render/cycles/nodes/introduction.html.

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I think I have a solution to your problem.

Try "Cntrl + Alt + B"

This is called the 'Render Border'.

I accidentally "created" a render border. This is why my Cycles was grey.

It's not a color or material problem.

This feature is used to render only a selected amount of your screen, just in case you need to save on render time.

I guess I accidentally pressed "cntrl + B" and created a tiny sliver of a border instead of a square (which is why I didn't know I had this feature on).

"Cntrl + B" activates the feature. Click and drag to create a border and your render shows inside of the shape you make.

To turn the feature off completely, just press "Cntrl + Alt + B".

Now, the border is removed and your render is back to normal.

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