The scrolling fills in the transparency, and you can't achieve both transparency and scrolling together through conventional means. If you place a very translucent scrolling image or texture on top of a solid base with some transparent areas, you can still make it appear as if there are transparent areas while the rest of the preset appears to be scrolling. Though in the case of the preset you're making, I don't think this will work well, as your scroll image appears to be multicolored. It works better if the scrolling image is the same color of the base, only slightly lighter or darker - so you can make it as transparent as possible (so it's unnoticable when it scrolls over the transparent areas), with still showing up on the 'base'. The coding I used looked like this (With the 'wings.png' being the solid base with some transparent areas, and 'fire1.png' being the scrolling image ontop of it):
material preset_4_equipMatL
{
technique
{
pass
{
alpha_rejection greater_equal 128
ambient 0.5 0.5 0.5 1.0
texture_unit
{
texture wing.png
}
}
pass
{
scene_blend alpha_blend
texture_unit
{
texture fire1.png
scroll_anim 0.2 0.2
}
}
}
}
Hopefully that helps, sorry if it's a little confusing.