How can I specify a pick vector of straight down? (0, -1, 0) doesn't seem to work correctly - I either get every object in my terrain (255), or a null array (which means I'm not pointing at any part of the terrain.
As you can see, having every object in the scene returned doesn't really help me a whole lot. With a vector straight down, I should be able to rotate, climb, etc. without worrying about where I physically am.
Thx.
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