colormap - using colormaps
A colormap cmap is defined by a m x 3 matrix. m is the number of colors. Color number i is given as a 3-uple cmap(i,1), cmap(i,2) cmap(i,3) corresponding respectively to red, green and blue intensity between 0 and 1.
At the beginning, 32 colors are defined in the colormap. You can change the colormap by using xset("colormap",cmap).
Each color in the colormap has an id you have to use to specify color in most plot functions. To see the ids, use xset() or xgetcolor().
You can come back to default colormap with xset("default").
m=228;
n= fix(3/8*m);
r=[(1:n)'/n; ones(m-n,1)];
g=[zeros(n,1); (1:n)'/n; ones(m-2*n,1)];
b=[zeros(2*n,1); (1:m-2*n)'/(m-2*n)];
h=[r g b];
xset("colormap",h)
plot3d1()
xset("default")