Camera collisions on Roblox

While working on some games, I've needed to modify Roblox's default camera to allow for a user to "move through" an opaque part. By default, this behavior is not officially supported.

The problem

Camera collision group — Collision groups

local function canOcclude(part)
    return
        getTotalTransparency(part) < 0.25 and
        part.CanCollide and
        subjectRoot ~= (part:GetRootPart() or part) and
        (not part:IsA("TrussPart")) and
        PhysicsService:CollisionGroupsAreCollidable(part.CollisionGroup, "Camera") 
end