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With this amazing tutorial (5:56 - 10:00) I imported my video as PNG image sequence and with the depth maps made it into an animated 3D image sequence. (But this is all just a plane object)

enter image description here

How to export this 3D animated image sequence as an animated 3D object? I need to have it in Unreal Engine animated, 3-dimensional and extruded like this. I only found explanations on how to export this as a video or IMG sequence (which it already is).

My version is 2.93 And please have in mind when answering that I'm not too good with Blender, so imagine you're talking to a complete beginner lol!

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  • $\begingroup$ If I understood properly, in general, you can't just 'export' to convert from a planar 2D image to the underlying 3D information it appears to be a window into. There are methods for taking large numbers of static 2D images, e.g. photos taken from different angles, and automatically trying to build a corresponding 3D model, but this generally requires more than just one angle, and is not as simple as exporting from one file type to another; it usually requires trial-and-error. This area of work is en.wikipedia.org/wiki/Structure_from_motion; there are some Blender addons for this. $\endgroup$ Commented Apr 5, 2023 at 11:15
  • $\begingroup$ In case it helps, the basic reason this isn't just a straightforward export is that any given 2D image contains strictly less (a lot less) information than a full 3D model. Going from 2D to 3D requires a fairly complex process for trying to extrapolate from the 2D information to corresponding 3D information. Structure-from-motion algorithms attempt to do this by assuming they have access to many different perspectives on the same fixed 3D object. $\endgroup$ Commented Apr 5, 2023 at 11:16
  • $\begingroup$ Hi @NeverConvex thank you very much for your answers. Just to clarify - are you talking about photogrammetry? This is how this image sequence looks in motion in Blender youtube.com/shorts/ZS0WhLrkLgM - I would like to have it like that in Unreal Engine as well, regardless if it's a 3D object or an extruded image sequence. I just thought as I achieved it here already there would be an easy way to transfer it like that directly to Unreal. Maybe I should try it there directly from scratch? $\endgroup$
    – stnkl666
    Commented Apr 5, 2023 at 16:36
  • $\begingroup$ Yes, SfM is a specific photogrammetry technique, as I understand it. And -- oh, I think I misunderstood your goal; you want to convert a preexisting extrusion to a 3D model; I didn't appreciate from your original question that you already have the extrusion present. That may be more easily doable, then; will try to come back later if no one else suggests a method first $\endgroup$ Commented Apr 5, 2023 at 17:36
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    $\begingroup$ @NeverConvex hey, I managed to do it in Unreal Engine!! forums.unrealengine.com/t/… here's the topic with my explanation, this tutorial helped me a lot! youtube.com/watch?v=1GkS9-94k80 $\endgroup$
    – stnkl666
    Commented Apr 6, 2023 at 21:56

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I didn't figure how to export this, but my main goal was achieving the same thing in Unreal Engine (and even additionally the background transparency) which I did!

So first I added an image sequence as explained here, for both the base color and another one for the depth maps. Then I followed this tutorial to "extrude" it (displacement/tessellation).

I achieved background transparency by setting the material type to "masked" and then plugging the media texture's alpha channel into the "opacity mask" option.

I initially achieved the transparency in my image sequence by editing the first image in Photoshop and exporting it as .png, and then using the amazing program Ebsynth to generate the rest of the sequence like that based on the first one.

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