> You are right, a pity I have to lose the opacity 'effect' (this part of svg > was part of a bigger one wit stuff that went under the rect). no, you don't, you can use group-opacity instead of individual opacity. I would also suggest that you slightly overlap the rects by increasing the width and height attribute a little bit, to avoid rendering artefacts. By using group opacity instead of individual opacity you don't see the overlapping effect on the individual rectangles. Have a look at http://www.carto.net/neumann/temp/rects.svg for an example on overlapping and group opacity. If you need an algorithm to calculate gray values according to height values in the terrain and a given light direction, I can send you pointers - that's a well-known problem in GIS and a very simple formula. ANdreas
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