Okay. Thanks. Lights are continuing to come on...

So...would you typically take your base skin (i.e. the one in which I've already painted roads and grassy areas and stone areas in the higher moutain parts, etc) and somehow convert that base image into an image that will communicate to the shader code how to blend onto the .hmp a combination of 3 or 4 textures? If so, do you typically drop the use of such a base image as being overlayed over the entire terrain (i.e. not scaled), or can you use it both as one of the four textures (not scaled) and also tweak a version of it into your alpha map?

Or...would you start with your grayscale image you used to create your .hmp in the first place and use that as your base image?

Also...am I right in understanding that you could have a shader that blends four different textures depending upon the RGBA channels? The one I'm using blends two textures. Are there any examples out there of ones that make use of all four channels?

Thanks guys for your help. It's getting clearer, but obviously some of this stuff is still fuzzy for me...

Peter