if so, i guess it is a problem with your mesh. what happens if you render it double-sided?
-> means to apply this code:
Code:
material tree_mat{
effect="
texture entSkin1;
pass p0 {
texture[0]=<entSkin1>;
zWriteEnable=true;
alphaBlendEnable=true;
cullmode=none;//renders both sides of a polygon
}";
}
action alphaTree{
my.material=tree_mat;
}