Hi Fabrice,

You could define you own shades of gray (I believe there are at least 50) by adjusting the rgb values as I've shown below.

definecolor [ name = "lightergray", r = 0.55, g = 0.55, b = 0.55 ] ;

draw lmt_shade [

path = (z0--z4--z5--z1--cycle),

direction = "left",

alternative = "linear",

colors = {"lightergray", "verylightgray"},

] xshifted 5cm;

I added it to your code after the lines:

draw z0--z4--z3--cycle;

draw z1--z5--z2--cycle;

draw rectangle;

Hope this helps.

Best Wishes

Keith

Hi,
Sorry for the late response. Thanks for the help. So I read the documents and managed to get a gradient even if it's not exactly like the figure.
Fabrice

draw lmt_shade [
              path = (z0--z4--z5--z1--cycle),
              direction = "left",
              alternative = "linear",
              colors = {"black", "lightgray"},
            ] ;

Le ven. 6 oct. 2023 à 08:27, Henning Hraban Ramm <texml@fiee.net> a écrit :

While the luametafun (“Metafun XL”) manual is also (meta)fun, I meant
the general metafun(-s|-p) manual, the big one (>400 p. in the “print”
version, >600 p. in the “screen” version). Recommended!

Hraban

Am 06.10.23 um 10:08 schrieb Keith McKay:
> Also look at the LuaMetaFun manual chapter 8. In fact the whole manual
> is worth a read. I'm sure you find much of use in it.
> Best Wishes
> Keith
>
> On Thu, 5 Oct 2023, 20:52 Henning Hraban Ramm, <texml@fiee.net
> <mailto:texml@fiee.net>> wrote:
>
>     Am 05.10.23 um 21:50 schrieb Fabrice Couvreur:
>      > Hi,
>      > I would like to obtain, if possible, a gray gradient like in the
>     image.
>      > My code uses Metapost but maybe this is possible with Metafun.
>
>     Have a look into the Metafun manual, chapter 8.1 “shading”.
>
>     Hraban

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