This sounds cool ... but why not just use invisible collision for your linepicks and collisions? Everything we do now if our terrains (and now we are using multiple terrains for blending) has invisible low poly collision for physics and picks etc... We have 50,000 polygon meshes with 8,000 polygon collisions meshes for physics, picks, etc... Also, there there's no need for extra renders etc...
Disable a surface >:D
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