Answers.Body: <p>I solved my own problem after some more trial and error. For awhile it looked like the fact that I was using Mental Ray shaders combined with general shaders was the problem, but that didn't really make sense so I kept tweaking. It turns out that an image plane I had tied to my camera was the problem. The image on the plane never rendered out, so I assumed the plane wasn't affecting the rendering, but it turns out it was showing up as a black plane when rendered. I deleted the plane for my render and it works fine now.</p>
  
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2015-07-02T20:06:29.927Z
Answers.LastActivityDate: 2015-07-02T20:06:29.927Z
Answers.UserDisplayName: KC McLaughlin
Body: <p>I'm trying to export a scene to composite in Nuke.  When I "render current frame" and save the image from there, I get an image with an alpha channel, but when I batch render the images don't have the alpha channel.</p>
  
  <p><img src="https://i.sstatic.net/myJnQ.png" alt="enter image description here"></p>
  
  <p><img src="https://i.sstatic.net/qAubM.png" alt="enter image description here"></p>
  
Comments.ContentLicense: CC BY-SA 3.0
Comments.CreationDate: 2015-07-02T10:33:56.107Z
Comments.Text: Hard to say. In general your _beauty pass_ should contain the alpha. Bmp is very limited, try to render as exr. Also check if _Pass Custom Alpha Channel checkbox_ is enabled.
Comments.UserDisplayName: p2or
Tags: <animation-rendering><nuke><compositing><maya><alpha>
Title: Maya batch render missing alpha channel
UserDisplayName: KC McLaughlin
ThreadText: # Maya batch render missing alpha channel
  
  (Asked by: username_0 on 2015-07-02)
  
  I'm trying to export a scene to composite in Nuke. When I "render current frame" and save the image from there, I get an image with an alpha channel, but when I batch render the images don't have the alpha channel.
  
  ![enter image description here](https://i.sstatic.net/myJnQ.png)
  
  ![enter image description here](https://i.sstatic.net/qAubM.png)
  
  **Tags:** animation-rendering, nuke, compositing, maya, alpha
  
  > **Comments:**
  > **username_1**: Hard to say. In general your _beauty pass_ should contain the alpha. Bmp is very limited, try to render as exr. Also check if _Pass Custom Alpha Channel checkbox_ is enabled.  
  
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  ## 1 answers
  
  ### Answer by username_0 on 2015-07-02. Score: 1
  
  I solved my own problem after some more trial and error. For awhile it looked like the fact that I was using Mental Ray shaders combined with general shaders was the problem, but that didn't really make sense so I kept tweaking. It turns out that an image plane I had tied to my camera was the problem. The image on the plane never rendered out, so I assumed the plane wasn't affecting the rendering, but it turns out it was showing up as a black plane when rendered. I deleted the plane for my render and it works fine now.
  
  
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