Re: Explicit color for pm3d

[Douglas M. <dou...@gm...>]

One item that just occurred to me makes this method extremely versatile.

Let's say you have a surface. It should be trivial to calculate the gradient
at any point in the surface by simply calculating the difference to each
neighboring point. (I wonder if gnuplot could provide this functionality
built in or through a clever trick so it can operate with dgrid3d).

Based on the technique of normal maps, you can create a function that simply
adds or subtracts light (i.e., each RGB channel in unison) based on the
angle of the gradient. Or simply provide said normal map which has its own
uses.

This would permit a perfectly usable bump map in gnuplot, without having to
invoke openGL or hellish programming hurdles for the developers. It cannot
provide shadows, but I wonder if that's even a good idea anyways.

What do you think?

Douglas

On Mon, Mar 28, 2011 at 8:42 PM, Daniel J Sebald <dan...@ie...>wrote:

> On 03/28/2011 12:40 PM, Ethan A Merritt wrote:
>
> > What you're describing is more like a texture map.
> > Input a NxM pixmap, distort/project it onto a surface defined
> > by an explicit function or coarse sampling.
>
> Yes, like a relief map of some sort.
>
> Dan
>
>
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