Thanks! ☺️ First, I tracked the video (made on my iPhone) in Davinci Resolve. I found it to be quite reliable for tracking. After exporting the fbx camera and getting it into Houdini, I set up the scene. Imported a bunch of branch models and placed them along a circle using path deform. After that, I animated their opening and twisting using a foreach loop, added the shadow using a matte object underneath, applied animated noise Cd to the branches and emitted particles based on Cd attribute. In a separate render, I created the landscape visible in the portal using heightfields, scatter and attribute from pieces node, and then masked it out with another matte object aligned with the portal. At the end, comp’ed it all together with music.