Asymptote 表面上的彩虹文字

Question

我正在寻找一种方法来为表面上呈现的渐变文本着色。下面是一个示例，显示了具有渐变的表面和黑色文本。如何更改文本颜色？

\documentclass{standalone}
\usepackage{asypictureB}
\begin{document}
\begin{asypicture}{name=text}
import graph3;
import contour;
import palette;

size(8cm,IgnoreAspect);

currentprojection=orthographic(-10,-10,8);
limits((0,0,0),(5,10,12));

real f(pair z) {return (z.x+z.y)/(2+cos(z.x)*sin(z.y));}

surface s=surface(f,(0,0),(5,10),50,Spline);

draw(s,mean(palette(s.map(zpart),Rainbow())),black);

string text="lorum ipsum";
real uoffset=1; 
real voffset=1; 
real h=0.1;
draw(surface(xscale(0.9)*yscale(0.9)*text,s,uoffset,voffset,h));

\end{asypicture}
\end{document}

Answer 1

好的，那就开始吧。我不认为你选择的表面特别好，但这只是个人喜好问题。问题是在表面上绘制文本并赋予其彩虹色，这实际上并不太难。

\documentclass{standalone}
\usepackage{asypictureB}
\begin{document}
\begin{asypicture}{name=text}
import graph3;
import contour;
import palette;

size(8cm,IgnoreAspect);

currentprojection=orthographic(-10,-10,8);
limits((0,0,0),(5,10,12));

real f(pair z) {return (z.x+z.y)/(2+cos(z.x)*sin(z.y));}

surface s=surface(f,(0,0),(5,10),50,Spline);

draw(s,red+opacity(0.4));//mean(palette(s.map(zpart),Rainbow())),black

string text="\textbf{lorum ipsum}";
real uoffset=1; 
real voffset=1; 
real h=0.1;
draw(surface(xscale(0.4)*yscale(0.4)*text,s,uoffset,voffset,h),mean(palette(s.map(zpart),Rainbow())),black);
//draw(surface(xscale(0.9)*yscale(0.9)*text,s,uoffset,voffset,h));

\end{asypicture}
\end{document}

原始答案：

\documentclass{standalone}
\usepackage{asypictureB}
\begin{document}
\begin{asypicture}{name=text}
size(5cm);
pen[][] p={{white,grey,black},
           {red,green,blue},
           {cyan,magenta,yellow}};
latticeshade(texpath("text"),p);
\end{asypicture}
\end{document}