diff --git a/files.html b/files.html
index 178d7ad9a3f628c393ed56c855a7fcc7186d5a75..df176efc35367ab7efefc199974e5faf4561c2ae 100644
--- a/files.html
+++ b/files.html
@@ -78,6 +78,7 @@
<a href='./modules/frep/transforms/reflect'>reflect</a><br>
<a href='./modules/frep/transforms/repeat'>repeat</a><br>
<a href='./modules/frep/transforms/rotate'>rotate</a><br>
+ <a href='./modules/frep/transforms/slice'>slice</a><br>
<a href='./modules/frep/transforms/translate'>translate</a><br>
<i> view</i><br>
<a href='./modules/frep/view/render%20(CPU)'>render (CPU)</a><br>
diff --git a/modules/frep/transforms/slice b/modules/frep/transforms/slice
new file mode 100644
index 0000000000000000000000000000000000000000..4ce31fbaf17163a936af841efbf62b135a513958
--- /dev/null
+++ b/modules/frep/transforms/slice
@@ -0,0 +1,197 @@
+//
+// frep slice
+//
+// 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 slice'
+//
+// initialization
+//
+var init = function() {
+ mod.x0.value = ''
+ mod.x1.value = ''
+ mod.y0.value = ''
+ mod.y1.value = ''
+ mod.z0.value = ''
+ mod.z1.value = 0
+ }
+//
+// inputs
+//
+var inputs = {
+ shape:{type:'',
+ event:function(evt){
+ mod.shape = evt.detail
+ outputs.shape.event()
+ }}}
+//
+// outputs
+//
+var outputs = {
+ shape:{type:'',
+ event:function(){
+ 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]
+ }
+ var variables = mod.shape.variables
+ var fn = mod.shape.function
+ if (mod.x0.value != '') {
+ var x0 = parseFloat(mod.x0.value)
+ var xvar = variables[0]
+ fn = `Math.min((${xvar}-(${x0})),(${fn}))`
+ limits[0][0] = Math.max(limits[0][0],x0)
+ }
+ if (mod.x1.value != '') {
+ var x1 = parseFloat(mod.x1.value)
+ var xvar = variables[0]
+ fn = `Math.min(((${x1})-${xvar}),(${fn}))`
+ limits[0][1] = Math.min(limits[0][1],x1)
+ }
+ if (mod.y0.value != '') {
+ var y0 = parseFloat(mod.y0.value)
+ var yvar = variables[1]
+ fn = `Math.min((${yvar}-(${y0})),(${fn}))`
+ limits[1][0] = Math.max(limits[1][0],y0)
+ }
+ if (mod.y1.value != '') {
+ var y1 = parseFloat(mod.y1.value)
+ var yvar = variables[1]
+ fn = `Math.min(((${y1})-${yvar}),(${fn}))`
+ limits[1][1] = Math.min(limits[1][1],y1)
+ }
+ if (mod.z0.value != '') {
+ var z0 = parseFloat(mod.z0.value)
+ var zvar = variables[2]
+ fn = `Math.min((${zvar}-(${z0})),(${fn}))`
+ limits[2][0] = Math.max(limits[2][0],z0)
+ }
+ if (mod.z1.value != '') {
+ var z1 = parseFloat(mod.z1.value)
+ var zvar = variables[2]
+ fn = `Math.min(((${z1})-${zvar}),(${fn}))`
+ limits[2][1] = Math.min(limits[2][1],z1)
+ }
+ var shape = {function:fn,variables:mod.shape.variables,limits:limits,type:mod.shape.type}
+ mod.fn.value = fn
+ mods.output(mod,'shape',shape)}
+ }}
+//
+// interface
+//
+var interface = function(div){
+ mod.div = div
+ //
+ // x0
+ //
+ div.appendChild(document.createTextNode('x0: '))
+ var input = document.createElement('input')
+ input.type = 'text'
+ input.size = 3
+ div.appendChild(input)
+ mod.x0 = input
+ //
+ // x1
+ //
+ div.appendChild(document.createTextNode(' x1: '))
+ var input = document.createElement('input')
+ input.type = 'text'
+ input.size = 3
+ div.appendChild(input)
+ mod.x1 = input
+ div.appendChild(document.createElement('br'))
+ //
+ // y0
+ //
+ div.appendChild(document.createTextNode('y0: '))
+ var input = document.createElement('input')
+ input.type = 'text'
+ input.size = 3
+ div.appendChild(input)
+ mod.y0 = input
+ //
+ // y1
+ //
+ div.appendChild(document.createTextNode(' y1: '))
+ var input = document.createElement('input')
+ input.type = 'text'
+ input.size = 3
+ div.appendChild(input)
+ mod.y1 = input
+ div.appendChild(document.createElement('br'))
+ //
+ // z0
+ //
+ div.appendChild(document.createTextNode('z0: '))
+ var input = document.createElement('input')
+ input.type = 'text'
+ input.size = 3
+ div.appendChild(input)
+ mod.z0 = input
+ //
+ // z1
+ //
+ div.appendChild(document.createTextNode(' z1: '))
+ var input = document.createElement('input')
+ input.type = 'text'
+ input.size = 3
+ div.appendChild(input)
+ mod.z1 = input
+ div.appendChild(document.createElement('br'))
+ //
+ // function
+ //
+ div.appendChild(document.createTextNode('function: '))
+ div.appendChild(document.createElement('br'))
+ var input = document.createElement('input')
+ input.type = 'text'
+ input.size = 10
+ div.appendChild(input)
+ mod.fn = input
+ div.appendChild(document.createElement('br'))
+ //
+ // output button
+ //
+ var btn = document.createElement('button')
+ btn.style.padding = mods.ui.padding
+ btn.style.margin = 1
+ btn.appendChild(document.createTextNode('output'))
+ btn.addEventListener('click',function(){
+ outputs.shape.event()
+ })
+ div.appendChild(btn)
+ }
+//
+// 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 c4646a81ab293de088fcf512cd4c67f59713bbdc..312158d16faf66ce1302fbd7da5419fd702f5397 100644
--- a/modules/index.js
+++ b/modules/index.js
@@ -49,6 +49,7 @@ module_menu(' extrude','modules/frep/transforms/extrude')
module_menu(' reflect','modules/frep/transforms/reflect')
module_menu(' repeat','modules/frep/transforms/repeat')
module_menu(' rotate','modules/frep/transforms/rotate')
+module_menu(' slice','modules/frep/transforms/slice')
module_menu(' translate','modules/frep/transforms/translate')
module_label(' view')
module_menu(' render (CPU)','modules/frep/view/render%20(CPU)')