restore Build,TODO from r57911

git-svn-id: svn://tug.org/texlive/trunk@57915 c570f23f-e606-0410-a88d-b1316a301751

1 files changed, 17 insertions, 0 deletions

diff --git a/Build/source/utils/asymptote/examples/vectorfieldsphere.asy b/Build/source/utils/asymptote/examples/vectorfieldsphere.asy
new file mode 100644
index 00000000000..7f1e49057a5
--- /dev/null
+++ b/Build/source/utils/asymptote/examples/vectorfieldsphere.asy
@@ -0,0 +1,17 @@
+import graph3;
+
+size(12cm);
+
+currentprojection=orthographic(1,-2,1);
+currentlight=(1,-1,0.5);
+
+triple f(pair z) {return expi(z.x,z.y);}
+
+path3 vector(pair z) {
+  triple v=f(z);
+  return O--(v.y,v.z,v.x);
+}
+
+add(vectorfield(vector,f,(0,0),(pi,2pi),10,0.25,red,render(merge=true)));
+
+draw(unitsphere,gray+opacity(0.5),render(compression=0,merge=true));