Quote - So, because you didn't succed at making this, it means Vue cannot do it? Very "empiric" (if this word exists in english) conclusion. How about using a 16bit image instead of a jpg or png? How about using erosion filters on the resulting terrain?

Above I said I used a 16 bit image and it had no better results and unfortunately the erosion filters don't get rid of the pixelated look of the rivers edge.

I didn't think it would be so difficult to cut out a river in a terrain using an image map and get decent results.
Bruno, if you can do this, then please explain and show your results as I am all ears. : )