Draw a gradient on 3d suface.

I have matrixes of temperatures and thicknesses. I use "surf" to draw thickness and i want to place arrows on this surface, like function "quiver" draws arrows on 2d surface. I know about function quiver3, but it draws something like a hedgehog. I need this arrows to be on surface.
I also tried "streamslice", but this function doesn't indicate the difference in value of gradients.
I'll be appreciated for your advices.

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2013-2-20

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