using ambient occlusion with alpha

[Adam Sale <adamsale(at)shaw.ca>]

trying to come up with a shader network that allows occlusion to work with an alpha mapped grid of a grass texture..

 

I can get the alpha cutout and the occlusion working properly on the grass, but the grid itself casts occlusion onto a ground plane, and the occlusion shape being cast is of the grid , not of the alpha grassblades itself... occlusion is essentially ignoring the alpha..

 

any tips on getting these to work together?

 

thanks all

 

Adam