diff --git a/a.txt b/a.txt
index 41d067e..8af6e78 100644
--- a/a.txt
+++ b/a.txt
@@ -1,4 +1,4 @@
-Geological layer generator for [Minetest] "rocks"
+Geological layer generator for Minetest "rocks" {wip}
 =============
 
 Aim of this mod is to replace all generic stone (default:stone) and 
diff --git a/rocks/veins.lua b/rocks/veins.lua
new file mode 100644
index 0000000..c7ec2b6
--- /dev/null
+++ b/rocks/veins.lua
@@ -0,0 +1,54 @@
+-- experimental fast vein generator
+
+rocks.veins={}
+
+table.insert(rocks.veins,{
+ scarcity=80,
+ 
+})
+
+
+rocksl.genvein=function(minp,maxp,pr,vm,area)
+ local t1 = os.clock()
+ local data = vm:get_data()
+
+ local chunksizer = maxp.x - minp.x + 1
+ local chunksize = chunksizer + 1
+ local pmapsize = {x = chunksize, y = chunksize, z = chunksize}
+ local minpxz = {x = minp.x, y = minp.z}
+ local c_sample=minetest.get_content_id("default:stone")
+ local c_sample_ore=minetest.get_content_id("default:mese")
+ 
+
+  local A=vector.new(pr:next(0,chunksizer)+minp.x,pr:next(0,chunksizer)+minp.y,pr:next(0,chunksizer)+minp.z)
+  local B=vector.new(pr:next(0,chunksizer)+minp.x,pr:next(0,chunksizer)+minp.y,pr:next(0,chunksizer)+minp.z)
+  local C=vector.new(pr:next(0,chunksizer)+minp.x,pr:next(0,chunksizer)+minp.y,pr:next(0,chunksizer)+minp.z)
+  local D=vector.new(pr:next(0,chunksizer)+minp.x,pr:next(0,chunksizer)+minp.y,pr:next(0,chunksizer)+minp.z)
+  local l1=vector.distance(A,C)+vector.distance(C,B)
+  local l2=vector.distance(A,D)+vector.distance(D,B)
+  local step=1.4/math.max(l1,l2)
+  print("step="..step.." l1="..l1.." l2="..l2)
+  local scarcity=6
+  local ocn=pr:next(0,scarcity)+(scarcity/2)
+  for t=0, 1, step do
+   local P=vector.multiply(A,(1-t)^2)
+   P=vector.add(P, vector.multiply(B,t*t) )
+   local Q=vector.add(P, vector.multiply(D,2*t*(1-t)) )
+   P=vector.add(P, vector.multiply(C,2*t*(1-t)) )
+   local step2=1/vector.distance(P,Q)
+   for u=0, 1, step2 do
+    local R=vector.add(vector.multiply(P,(1-u)), vector.multiply(Q,u) )
+    local di=area:indexp(vector.round(R))
+    if ocn<1 then
+     data[di]=c_sample_ore
+     ocn=pr:next(0,scarcity)+(scarcity/2)
+    else
+     data[di]=c_sample
+     ocn=ocn-1
+    end
+   end
+  end
+
+ vm:set_data(data)
+ minetest.log("action", "rocks/genvein/ "..math.ceil((os.clock() - t1) * 1000).." ms ")
+end
\ No newline at end of file