Blob light projector tiling across deformed terrain

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Pictured above is what I am trying to accomplish. I'm projecting a hexagon grid onto some terrain so that when there are changes in the terrain elevation, there is still a visible grid if you look at the terrain from directly above. So far, things are working great until...

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...Until I attempt to actually deform the terrain. Once I do that, the orthogonal projection stops tiling and will only actually effect the area it's being projected on to. Is there an easy way to fix this?

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Answer by Myrddraal · Sep 21, 2012 at 04:37 PM

I think I found the solution: make the projector the same size as the terrain object.

It takes a bit of tweaking to get the tiling right, but it works. The reason the problem occurs is because of the way Unity divides the terrain up into multiple meshes for creating LODs. That's why the problem doesn't occur if the terrain is not deformed.

Hope this helps.

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OPtoss · Sep 21, 2012 at 07:28 PM 0

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Hey $$anonymous$$yrddraal,

Sweet name btw, I'm reading "The Great Hunt" right now!

So I know that works, but I want to avoid the inefficiency of doing that... I am assu$$anonymous$$g it is much more inefficient, but I might do some profiling to see just how much worse it is.

Thanks for the thought though. I'll try it out!

Myrddraal · Sep 22, 2012 at 03:12 AM 0

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I think it is worse in terms of efficiency, as it will cause an extra draw call for each extra mesh the terrain gets divided into, but I don't think there's any way around that. It's less efficient but it's the only solution that works (that I'm aware of).

Blob light projector tiling across deformed terrain

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