enter image description hereenter image description hereGOAL - To track a source video to get the tracking data while excluding the actual video in the final Render.


I've tracked the video, but it is just the base video and I have an edited video in After Effects that I want to apply the effects from Blender onto. I tracked this source video expecting to be able to create my effect (ember particles) with the video as a reference not a final product. I can't seem to find a way to disable the video in my motion tracked scene during my final render. I'm not sure if I should try getting rid of the video or extracting the camera data and putting it into a new scene.

  • $\begingroup$ That is very easy, just disconnect the movie node from the original movie and use an other one with the new one. To help you better please use the edit link at the bottom of your question(i.stack.imgur.com/lXFuK.png) and add an image that shows your current render nodes. $\endgroup$ – user1853 Sep 30 '17 at 1:25
  • $\begingroup$ That sounds like that would work if I was planning to have the finished shot in blender, but I want the finished shot to be done in After Effects. If I remove the video can I just leave it blank to get a transparent background? $\endgroup$ – Langston Bables Sep 30 '17 at 2:28

Do not make a new scene, you do need the tracking information.

Basically what you don't need is the video to be part of the compositing.

But since you are using undistortion you need to distort your output so that it matches the original footage. (Use the undistort node but change its function to distort and set it to use the information from the original tracked video clip)

enter image description here

The rest is easy, just render your particles using a transparent background (film transparent https://i.stack.imgur.com/yR1He.png)

Render as image sequence in OpenEXR format.

Then bring the rendered image sequence into the compositing software you will use to finish the shot.

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  • $\begingroup$ Im not sure I understand how to do this. I switched the distortion to distort and toggled on transparency and nothing changed. Could ya give me a step by step perhaps? $\endgroup$ – Langston Bables Sep 30 '17 at 3:38
  • $\begingroup$ I have no clue how you set up your scene or your render layers. You just need the output of the layer that has your particles using transparency. Then save that as EXR. $\endgroup$ – user1853 Sep 30 '17 at 3:43
  • $\begingroup$ I followed this tutorial youtu.be/3STqy77jG50 . So I should be trying to get rid of the video? when I try to disconnect the vid I get an all white render. But yea I'll keep messing with it. thanks! $\endgroup$ – Langston Bables Sep 30 '17 at 3:51
  • $\begingroup$ Start by setting your nodes like the image above. The render layer should be the one that holds your particles. $\endgroup$ – user1853 Sep 30 '17 at 3:57
  • $\begingroup$ Alright cool so now it's rendering, but its just like the alpha. I'll add a picture. I can work with that, but I should probably know the proper way to do it. How can I get my full scene to render from here? $\endgroup$ – Langston Bables Sep 30 '17 at 4:12

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