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Starting with a scene like:

enter image description here

I want to bake to a transparent image like:

enter image description here

In Gimp a gradient can be added to transparency channel:

enter image description here

Result should be an animatable alpha-gradient (with high transparency but visible ,then the objects should blend in along x-axis):

enter image description here

How can this be achieved in Blender? Ideally all of this:

  • initially 20% transparency of objects
  • a gradient that allows to make the objects opaque from left to right
  • optinally a white border (no transparency at all).

All I get from the attached .blend is something like:

enter image description here

The transparency is lost after bake.

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  • $\begingroup$ is it enough to just create the effect with nodes ? $\endgroup$ – Chebhou Apr 19 '15 at 11:31
  • $\begingroup$ @Chebhou unfortunately no, I wan't to use it in a game engine (Unity) so that I have only to animate the alpha threshold to blend in the symbols when selected. $\endgroup$ – stacker Apr 19 '15 at 11:34
  • $\begingroup$ what about image sequence as a texture ? $\endgroup$ – Chebhou Apr 19 '15 at 11:35
  • $\begingroup$ I need many of them, still hope that there is an easy solution, the question could probably reduced to 'How to keep transparency when baking more than one (semi)-transparent object to a combined bake type image. $\endgroup$ – stacker Apr 19 '15 at 11:38
  • $\begingroup$ @Chebhou I updated the question and .blend hopefully it's now more clear what I'm looking for. $\endgroup$ – stacker Apr 19 '15 at 11:48
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I had no success with baking, but could achieve the desired effect by rendering the image.

  • Set the materials alpha channel to initial transparency

enter image description here

Materials properties

  • Add a plane with an alpha gradient as texxture behing the scene

    • In Gimp create an image with the required dimensions
    • From the layer context menu select Add Layer Mask
    • enter image description here
    • Use the Blend Tool to create tha gradient
    • enter image description here
    • Export to .PNG
  • Set camera to orthographic enter image description here

  • Render and save the image.
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