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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+
Hardware: Minimum of Intel Core i3 2.5Ghz or AMD Phenom II 2.6Ghz with 4 GB RAM; Intel HD Graphics 4000 / Nvidia GeForce 710 / AMD Radeon HD 6450 or better; screen resolution of 1280x768 or higher
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You can you do this by creating a new camera and render target for masking, disabling clear color on it, and using that as a mask texture for your effect camera. Then through script you can move an object to the touch position so it draws onto the mask.
I know that might sound confusing so I made a quick example project:
Download example project
Let me know if you need any more help!