diff --git a/files.html b/files.html
index 1c6846410d71a87ebc96d8364f402e2e95478bb3..84770acc08e22454fe9c8b8752b61d0904b40c96 100644
--- a/files.html
+++ b/files.html
@@ -73,6 +73,7 @@
<a href='./modules/frep/shapes/3D/cube'>cube</a><br>
<a href='./modules/frep/shapes/3D/cylinder'>cylinder</a><br>
<a href='./modules/frep/shapes/3D/function'>function</a><br>
+ <a href='./modules/frep/shapes/3D/pyramid'>pyramid</a><br>
<a href='./modules/frep/shapes/3D/sphere'>sphere</a><br>
<a href='./modules/frep/shapes/3D/torus'>torus</a><br>
<i> transforms</i><br>
diff --git a/modules/frep/shapes/3D/pyramid b/modules/frep/shapes/3D/pyramid
new file mode 100755
index 0000000000000000000000000000000000000000..1c740ac533db7b269643f25d3701e30251194ff6
--- /dev/null
+++ b/modules/frep/shapes/3D/pyramid
@@ -0,0 +1,173 @@
+//
+// frep pyramid
+//
+// 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 pyramid'
+//
+// initialization
+//
+var init = function() {
+ mod.x0.value = '0'
+ mod.x1.value = '1'
+ mod.y0.value = '0'
+ mod.y1.value = '1'
+ mod.z0.value = '0'
+ mod.z1.value = '1'
+ }
+//
+// inputs
+//
+var inputs = {
+ variables:{type:'',
+ event:function(evt){
+ for (var p in evt.detail)
+ mod[p].value = evt.detail[p]
+ outputs.variables.event()
+ outputs.shape.event()
+ }}}
+//
+// outputs
+//
+var outputs = {
+ shape:{type:'',
+ event:function(){
+ var x0 = parseFloat(mod.x0.value)
+ var x1 = parseFloat(mod.x1.value)
+ var y0 = parseFloat(mod.y0.value)
+ var y1 = parseFloat(mod.y1.value)
+ var z0 = parseFloat(mod.z0.value)
+ var z1 = parseFloat(mod.z1.value)
+ var fnx0 = `X-(${x0})-((Z-(${z0}))/((${z1})-(${z0})))*((${x1})-(${x0}))/2`
+ var fny0 = `Y-(${y0})-((Z-(${z0}))/((${z1})-(${z0})))*((${y1})-(${y0}))/2`
+ var fnx1 = `(${x1})-X-((Z-(${z0}))/((${z1})-(${z0})))*((${x1})-(${x0}))/2`
+ var fny1 = `(${y1})-Y-((Z-(${z0}))/((${z1})-(${z0})))*((${y1})-(${y0}))/2`
+ var fn = `Math.min(${fnx0},${fnx1})`
+ fn = `Math.min(${fny0},${fn})`
+ fn = `Math.min(${fny1},${fn})`
+ fn = `Math.min(Z-(${z0}),${fn})`
+ fn = `Math.min((${z1})-Z,${fn})`
+ var variables = ['X','Y','Z']
+ var limits = [[x0,x1],[y0,y1],[z0,z1]]
+ var type = 'Magnitude'
+ var shape = {function:fn,variables:variables,limits:limits,type:type}
+ mods.output(mod,'shape',shape)}
+ },
+ variables:{type:'',
+ event:function(){
+ var x0 = parseFloat(mod.x0.value)
+ var x1 = parseFloat(mod.x1.value)
+ var y0 = parseFloat(mod.y0.value)
+ var y1 = parseFloat(mod.y1.value)
+ var z0 = parseFloat(mod.z0.value)
+ var z1 = parseFloat(mod.z1.value)
+ var vars = {x0:x0,x1:x1,y0:y0,y1:y1,z0:z0,z1:z1}
+ mods.output(mod,'variables',vars)}
+ }}
+//
+// 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'))
+ //
+ // 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.variables.event()
+ 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 4e7e193aa255021ce6286d62f38fd0c4698d0ed5..d7cd2c05777101e878ce3cf252de0a59694f0bcc 100644
--- a/modules/index.js
+++ b/modules/index.js
@@ -43,6 +43,7 @@ module_menu(' cone','modules/frep/shapes/3D/cone')
module_menu(' cube','modules/frep/shapes/3D/cube')
module_menu(' cylinder','modules/frep/shapes/3D/cylinder')
module_menu(' function','modules/frep/shapes/3D/function')
+module_menu(' pyramid','modules/frep/shapes/3D/pyramid')
module_menu(' sphere','modules/frep/shapes/3D/sphere')
module_menu(' torus','modules/frep/shapes/3D/torus')
module_label(' transforms')