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Unfortunately, it's likely due to the operating system or hardware you're using – since they don't meet the system requirements for Lens Studio.
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Operating System: Windows 10 (64 bit); MacOS 10.11+
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I'm not sure, but I'm assuming a static object is a real world object that you want to overlay with fire in AR:
For a 2D object, you could use Marker Tracking, and attach a fire GIF to it. For a 3D object it might be more difficult. I would recommend using the Particle System and the user being able to re-position the emitter on a 2D plane in the Orthographic Cam.
If you mean an AR object, as in a 3D model, then you could just use the aforementioned particle system with an emitter coming from the object.
Here is the YouTube video on how the Particle System could be used for your purpose.
We have a little 2D fire animation we made in this project we made for the Twitch stream. Feel free to use it!
Stream: https://www.twitch.tv/videos/387230252
Lens: https://www.snapchat.com/unlock/?type=SNAPCODE&uuid=6f0a4886e000413a85e96541438b922c&metadata=01
Project: https://storage.googleapis.com/snapchat-lens-assets/f1a09194-f02d-43ed-92b8-62e843179ff0/lensStudio/Twitch/LSTwitch_CatFire.zip
Also check out the Smoke_Lighting and Embers example particles in the Particles template. You should be able to modify those to your liking. Info on modifying particles can be found here: https://lensstudio.snapchat.com/guides/general/particles/
great lens I really impressed by this lens because I am working on the same type of TV lens you cansee here.