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Hi Miles,
If I understand correctly you're running into the issue where your lens doesn't open with the back camera activated, by default?
You can solve that by going to your Project Info panel:
And in the "Lens works on" section you need to select the rear camera. This setting doesn't mean the user can't swap cameras anymore, it just means this lens will open with the rear camera activated by default.
Hi Miles,
You can't actually prevent the user from switching to the rear camera in your Lens. You can, as Bram suggested, set the Lens to only appear though when the user opens their Front Camera's Lens Carousel. If you want your Lens to only ever appear in the front camera carousel, set the Lens Works On drop down top "Only Front Camera".
Note, the user can still swap to the rear camera while in your Lens. There, you can add some logic to do something different or disable your content when the user swaps to the rear camera. To do this, I recommend using the behavior script since it allows you to do this without having to script logic.
You can get the behavior script here:
https://lensstudio.snapchat.com/guides/scripting/behavior-script/
Next, you can set your trigger type to "Back Camera". This will run the trigger when the user swaps to the rear camera. Then, as your response type, you could try using "Set Enabled" to enable or disable certain objects. Finally, you can use the "Front Camera" trigger type and "Set Enabled" response type again to reset everything when the user swaps back to the front camera.