about Binary alpha map

[maggie]

Lately,I am intrested in the Moving Grass. I want to make it with glsl ,but I don't know  What's the Binary alpha map. How to realize it . I need to have a look  at the code.Can you help me?   

[JeGX]

Did you see the code sample 83 ?
http://www.ozone3d.net/repository_hyperion_cs_vps.php#cs_83

The binary alpha map is just a way to create, a texture with the alpha chanel filled with 1 (if fully opaque) or 0 (if fully transparent).
In the code sample 83, the alpha chanel of the grass texture contains 0 if rgb == <0,0,0> or 1 if rgb != <0,0,0>. <0,0,0> or black is the transparency color.