diff --git a/files.html b/files.html
index d8a656fc940992ee5c7a6f009055c1ed9a541fd0..86706ed52d5aaf1d1fbd35cfd2f46ea9e1de9036 100644
--- a/files.html
+++ b/files.html
@@ -19,7 +19,6 @@
<a href='./js/files.js'>files.js</a><br>
<a href='./js/mods.js'>mods.js</a><br>
<a href='./js/modules.js'>modules.js</a><br>
-<i> node_modules</i><br>
<a href='./js/printserver.js'>printserver.js</a><br>
<a href='./js/programs.js'>programs.js</a><br>
<a href='./js/serialserver.js'>serialserver.js</a><br>
@@ -83,7 +82,8 @@
<a href='./modules/frep/transforms/extrude'>extrude</a><br>
<a href='./modules/frep/transforms/inflate'>inflate</a><br>
<a href='./modules/frep/transforms/reflect'>reflect</a><br>
- <a href='./modules/frep/transforms/repeat'>repeat</a><br>
+ <a href='./modules/frep/transforms/repeat%20linear'>repeat linear</a><br>
+ <a href='./modules/frep/transforms/repeat%20rotary'>repeat rotary</a><br>
<a href='./modules/frep/transforms/revolve'>revolve</a><br>
<a href='./modules/frep/transforms/rotate'>rotate</a><br>
<a href='./modules/frep/transforms/scale'>scale</a><br>
diff --git a/modules/frep/transforms/repeat b/modules/frep/transforms/repeat linear
similarity index 98%
rename from modules/frep/transforms/repeat
rename to modules/frep/transforms/repeat linear
index 695ed4a2f1541d80e99cdcff97ddf3a3e997e3e7..c1edbe2a8c1b6b734cc9bd758b8bcbd6985d7f48 100755
--- a/modules/frep/transforms/repeat
+++ b/modules/frep/transforms/repeat linear
@@ -1,5 +1,5 @@
//
-// frep repeat
+// frep repeat linear
//
// Neil Gershenfeld
// (c) Massachusetts Institute of Technology 2018
@@ -20,7 +20,7 @@ var mod = {}
//
// name
//
-var name = 'frep repeat'
+var name = 'frep repeat linear'
//
// initialization
//
diff --git a/modules/frep/transforms/repeat rotary b/modules/frep/transforms/repeat rotary
new file mode 100755
index 0000000000000000000000000000000000000000..338f98833d7b5321f20a22a80aabd2f8d90c6bba
--- /dev/null
+++ b/modules/frep/transforms/repeat rotary
@@ -0,0 +1,162 @@
+//
+// frep repeat rotary
+//
+// Neil Gershenfeld
+// (c) Massachusetts Institute of Technology 2018
+//
+// This work may be reproduced, modified, distributed, performed, and
+// displayed for any purpose, but must acknowledge the mods
+// project. Copyright is retained and must be preserved. The work is
+// provided as is; no warranty is provided, and users accept all
+// liability.
+//
+// closure
+//
+(function(){
+//
+// module globals
+//
+var mod = {}
+//
+// name
+//
+var name = 'frep repeat rotary'
+//
+// initialization
+//
+var init = function() {
+ mod.x.checked = true
+ mod.spacing.value = 0
+ mod.number.value = 10
+ }
+//
+// inputs
+//
+var inputs = {
+ shape:{type:'',
+ event:function(evt){
+ mod.shape = evt.detail
+ outputs.shape.event()
+ }}}
+//
+// outputs
+//
+/*
+ (x-x0)%spacing
+ x1 = min + num*space
+ x1-X
+*/
+var outputs = {
+ shape:{type:'',
+ event:function(){
+ var fn = mod.shape.function
+ var variables = mod.shape.variables
+ var type = mod.shape.type
+ var spacing = parseFloat(mod.spacing.value)
+ var number = parseInt(mod.number.value)
+ var limits = []
+ for (var v = 0; v < mod.shape.limits.length; ++v) {
+ limits[v] = []
+ limits[v][0] = mod.shape.limits[v][0]
+ limits[v][1] = mod.shape.limits[v][1]
+ }
+ if (mod.x.checked) {
+ var xvar = variables[0]
+ var xmin = limits[0][0]
+ var xmax = limits[0][1]
+ var re = new RegExp(xvar,'g')
+ fn = fn.replace(re,`((${xmin})+(${xvar}-(${xmin}))%(${spacing+xmax-xmin}))`)
+ fn = `Math.min(${xvar}-(${xmin}),${fn})`
+ fn = `Math.min((${xmin+number*(spacing+xmax-xmin)})-${xvar},${fn})`
+ limits[0][1] = xmin+number*(xmax-xmin)+(number-1)*spacing
+ }
+ else if (mod.y.checked) {
+ var yvar = variables[1]
+ var ymin = limits[1][0]
+ var ymax = limits[1][1]
+ var re = new RegExp(yvar,'g')
+ fn = fn.replace(re,`((${ymin})+(${yvar}-(${ymin}))%(${spacing+ymax-ymin}))`)
+ fn = `Math.min(${yvar}-(${ymin}),${fn})`
+ fn = `Math.min((${ymin+number*(spacing+ymax-ymin)})-${yvar},${fn})`
+ limits[1][1] = ymin+number*(ymax-ymin)+(number-1)*spacing
+ }
+ else if (mod.z.checked) {
+ var zvar = variables[2]
+ var zmin = limits[2][0]
+ var zmax = limits[2][1]
+ var re = new RegExp(zvar,'g')
+ fn = fn.replace(re,`((${zmin})+(${zvar}-(${zmin}))%(${spacing+zmax-zmin}))`)
+ fn = `Math.min(${zvar}-(${zmin}),${fn})`
+ fn = `Math.min((${zmin+number*(spacing+zmax-zmin)})-${zvar},${fn})`
+ limits[2][1] = zmin+number*(zmax-zmin)+(number-1)*spacing
+ }
+ var shape = {function:fn,variables:variables,limits:limits,type:type}
+ mods.output(mod,'shape',shape)}
+ }}
+//
+// interface
+//
+var interface = function(div){
+ mod.div = div
+ //
+ // axis
+ //
+ div.appendChild(document.createTextNode('axis: '))
+ div.appendChild(document.createTextNode('x'))
+ var input = document.createElement('input')
+ input.type = 'radio'
+ input.name = mod.div.id+'axis'
+ input.id = mod.div.id+'x'
+ div.appendChild(input)
+ mod.x = input
+ div.appendChild(document.createTextNode(' y'))
+ var input = document.createElement('input')
+ input.type = 'radio'
+ input.name = mod.div.id+'axis'
+ input.id = mod.div.id+'y'
+ div.appendChild(input)
+ mod.y = input
+ div.appendChild(document.createTextNode(' z'))
+ var input = document.createElement('input')
+ input.type = 'radio'
+ input.name = mod.div.id+'axis'
+ input.id = mod.div.id+'z'
+ div.appendChild(input)
+ mod.z = input
+ div.appendChild(document.createElement('br'))
+ //
+ // spacing
+ //
+ div.appendChild(document.createTextNode('spacing: '))
+ var input = document.createElement('input')
+ input.type = 'text'
+ input.size = 6
+ div.appendChild(input)
+ mod.spacing = input
+ div.appendChild(document.createElement('br'))
+ //
+ // number
+ //
+ div.appendChild(document.createTextNode('number: '))
+ var input = document.createElement('input')
+ input.type = 'text'
+ input.size = 6
+ div.appendChild(input)
+ mod.number = input
+ div.appendChild(document.createElement('br'))
+ }
+//
+// local functions
+//
+;
+//
+// return values
+//
+return ({
+ name:name,
+ init:init,
+ inputs:inputs,
+ outputs:outputs,
+ interface:interface
+ })
+}())
diff --git a/modules/index.js b/modules/index.js
index 8eb59cf8b932ebbcc849311767275b3fd410b2c2..028c637aecc835b240cc845baf99df5361c74d25 100644
--- a/modules/index.js
+++ b/modules/index.js
@@ -53,7 +53,8 @@ module_label(' transforms')
module_menu(' extrude','modules/frep/transforms/extrude')
module_menu(' inflate','modules/frep/transforms/inflate')
module_menu(' reflect','modules/frep/transforms/reflect')
-module_menu(' repeat','modules/frep/transforms/repeat')
+module_menu(' repeat linear','modules/frep/transforms/repeat%20linear')
+module_menu(' repeat rotary','modules/frep/transforms/repeat%20rotary')
module_menu(' revolve','modules/frep/transforms/revolve')
module_menu(' rotate','modules/frep/transforms/rotate')
module_menu(' scale','modules/frep/transforms/scale')