Hey folks,

Something I have never previously needed to do, but now find myself stumped by! - I am wanting to blend 2 bitmap textures in the A and B channels - a moss and a mud on a terrain, mapped parametrically. I need the moss/grass to be on the top/plateaus, and the mud to gradually blend down the slopes.

Now, I can get this to work by by having the moss in the B, and the mud in the A, but what I want to be able to control is the altitude at which this blend occurs - at the moment, the only way I can see to do it. is to scale the whole damned terrain up, since it appears to be goverend by some external world scale!?! - where is the altitude defined where these textures blend together? - can I just control it relative to the terrain?

Adam :)

Message edited on: 02/08/2006 08:12

I tend to use a third texture in the C channel to govern this. However I am far from an expert.

Hi there, Actually, yeah that appears to be the solution! - experimenting now! - thanks :) Adam

Adam, yes, use a third texture in C channel cause it is governed by the world scale otherwise. (As with A and B, Ctrl+Shift+click on C.) I suggest either using one of the fractal textures - Basic Altitude, note the capital A, and it's the second one of the fractal Basic textures - or using a gradient created in Photoshop. White means the texture in channel B will be applied and black means channel A. With the fractal texture you can use World Space mapping or World Side. You can adjust the ratio of mud/moss by going into Deep Texture Editor and adjusting the values in Filter dialog. Interestingly, Object Front mapping also works well, while Object Side doesn't. I don't have an image gradient but you will adjust the ratio by changing the white/black point in Photoshop and trying the mapping of the third channel. If I was unclear, just yell.

Thanks Erlik, Yeah I have got it - found the filter in the DTE and made a fractal altitude work as I wanted! :) Cheers Adam