Irrlicht Engine

Ok guys,
I got a bit further with my problem:

I just wrote "x*2" instead of "x*4".
The result was a blue version of my grass :D
So x*2 would mean (because each single pixel is changed),
that my texture has a 8-bit format (4bit*2)
And it seems that
I cant change the alpha value.
So I guess that I ...

@Bear: Sounds reasonable! :)

@arras:
I tried this code:




void MaskImage(video::ITexture* image,video::ITexture* mask,core::rect<s32> type)
{
s32* ibuf = (s32*)image->lock();
s32* mbuf = (s32*)mask->lock();


for(int x = type.UpperLeftCorner.X;x<type.LowerRightCorner.X;x++)
{
for(int y ...

Hi all,
i am new to Irrlicht :)
And soon I got my first problem:
I want to make an isometric game.
I made two pictures, the one is grass and the other shall be a mask with a isometric shape:

http://cultsoft.cu.ohost.de/pics/gras.jpg

http://cultsoft.cu.ohost.de/pics/masktile.jpg

And my goal is ...