Make realism-effects independent of currently used Three revision

[mjurczyk]

Prevents:

When importing Three from various sources (regardless the reason, ex. testing latest Three revision while realism dependencies weren't bumped yet.)

• Replace instanceof with .is<Class> checks

[vercel[bot]]

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Name	Status	Preview	Updated (UTC)
realism-effects	✅ Ready (Inspect)	Visit Preview	Jun 10, 2023 11:33pm

[0beqz]

Thanks, good to know, I'll keep that in mind in the future.