Ok, back to our cg talk conversation, lol! Of course I meant " x" when I said " w",  sorry!

The rotation parameters can be found in the lighting & effects tab of the advanced material editor. First you need to double click the underlying material of your ecosystem, you'll find 2 materials, one checkerboard, and some other mat I don't remember. Go to the lighting and effects tab of the checkerboard material, and you'll see "rotation and twist" checked. Edit this parameter with x and y axis set to 90°, and z axis to zero.