diff --git a/dist/solver.wasm b/dist/solver.wasm
index 01d053c..a4a67f0 100755
Binary files a/dist/solver.wasm and b/dist/solver.wasm differ
diff --git a/src/Scene.js b/src/Scene.js
index 95ff9d1..e21d596 100644
--- a/src/Scene.js
+++ b/src/Scene.js
@@ -300,7 +300,7 @@ async function addSketch() {
 }
 
 window.sc = new Scene(store)
-sc.loadState()
+// sc.loadState()
 
 
 
diff --git a/src/Sketch.js b/src/Sketch.js
index bc5e70a..d019f06 100644
--- a/src/Sketch.js
+++ b/src/Sketch.js
@@ -2,11 +2,11 @@
 
 import * as THREE from '../node_modules/three/src/Three';
 
-import { _vec2, _vec3, raycaster, awaitPts } from './shared'
+import { _vec2, _vec3, raycaster, awaitPts, ptObj } from './shared'
 
-import { drawOnClick1, drawOnClick2, drawPreClick2, drawClear } from './drawEvents'
+import { drawOnClick1, drawOnClick2, drawPreClick2, drawClear, drawPoint } from './drawEvents'
 import { onHover, onDrag, onPick, onRelease } from './mouseEvents'
-import { setCoincident } from './constraintEvents'
+import { setCoincident, setOrdinate } from './constraintEvents'
 import { get3PtArc } from './drawArc'
 import { replacer, reviver } from './utils'
 import { AxesHelper } from './sketchAxes'
@@ -47,13 +47,25 @@ class Sketch {
       this.l_id = 0;
 
       this.constraints = new Map()
-      this.c_id = 0;
+      this.c_id = 1;
 
       this.obj3d.add(new THREE.Group().add(new AxesHelper(0.5)));
       this.obj3d.add(new THREE.Group());
       this.obj3d.add(new THREE.Group());
 
       this.labels = []
+
+
+      const p1 = ptObj()
+      p1.matrixAutoUpdate = false;
+      p1.userData.constraints = []
+      this.obj3d.add(p1)
+      this.updatePointsBuffer()
+
+
+
+
+
     } else {
 
 
@@ -138,7 +150,7 @@ class Sketch {
     this.canvas.addEventListener('pointermove', this.onHover)
     this.store.dispatch({ type: 'set-active-sketch', sketch: this.obj3d.name })
 
-    
+
     this.setDimLines()
 
     window.sketcher = this
@@ -199,6 +211,14 @@ class Sketch {
       case 'd':
         this.drawDimension()
         this.mode = ""
+        break;
+      case 'p':
+        this.canvas.addEventListener('pointerdown',
+          (e) => {
+            drawPoint.call(this, e)
+          }
+        )
+
         break;
       case 'x':
         this.deleteSelected()
@@ -207,6 +227,18 @@ class Sketch {
 
         setCoincident.call(this)
 
+        this.mode = ""
+        break;
+      case 'v':
+
+        setOrdinate.call(this, 0)
+
+        this.mode = ""
+        break;
+      case 'h':
+
+        setOrdinate.call(this, 1)
+
         this.mode = ""
         break;
 
@@ -340,12 +372,12 @@ class Sketch {
 
 
   updateBoundingSpheres() {
-    for (let x = 3; x < this.obj3d.children.length; x++) {
+    for (let x = 3; x < this.obj3d.children.length; x++) { // geometry boundign spheres
       const obj = this.obj3d.children[x]
       obj.geometry.computeBoundingSphere()
     }
-  
-    for (let x = 0; x < this.obj3d.children[1].children.length; x++) {
+
+    for (let x = 0; x < this.obj3d.children[1].children.length; x++) { // dimension bounding sphere
       const obj = this.obj3d.children[1].children[x]
       obj.geometry.computeBoundingSphere()
     }
@@ -354,8 +386,8 @@ class Sketch {
 
     raycaster.setFromCamera(
       _vec2.set(
-        (e.clientX - this.rect.left)/ this.rect.width * 2 - 1,
-        - (e.clientY - this.rect.top)/ this.rect.height * 2 + 1
+        (e.clientX - this.rect.left) / this.rect.width * 2 - 1,
+        - (e.clientY - this.rect.top) / this.rect.height * 2 + 1
       ),
       this.camera
     );
diff --git a/src/constraintEvents.js b/src/constraintEvents.js
index 521334f..bf0c5fc 100644
--- a/src/constraintEvents.js
+++ b/src/constraintEvents.js
@@ -1,22 +1,5 @@
 
 
-export function addDimension(ent1, ent2, distance) {
-
-
-  // if (ent1.type ==)
-
-  this.constraints.set(++this.c_id,
-    [
-      'distance', distance,
-      [p1, p2, -1, -1]
-    ]
-  )
-
-  ent1.userData.constraints.push(this.c_id)
-  ent2.userData.constraints.push(this.c_id)
-}
-
-
 export function setCoincident() {
   const s = new Set()
   const toComb = []
@@ -41,12 +24,37 @@ export function setCoincident() {
 
   this.updateOtherBuffers()
   this.solve()
- 
+  this.updateBoundingSpheres()
+
   // update state of points
-  for (let obj of this.selected) {
-    obj.geometry.computeBoundingSphere()
-    obj.material.color.set(0x555555)
-  }
+  // for (let obj of this.selected) {
+  // obj.geometry.computeBoundingSphere()
+  // obj.material.color.set(0x555555)
+  // }
   this.selected = []
   this.obj3d.dispatchEvent({ type: 'change' })
 }
+
+
+export function setOrdinate(dir = 0) {
+
+
+  const line = this.selected[0]
+  this.constraints.set(++this.c_id,
+    [
+      dir ? 'vertical' : 'horizontal', -1,
+      [-1, -1, line.name, -1]  ///////
+    ]
+  )
+  line.userData.constraints.push(this.c_id)
+  
+
+  this.updateOtherBuffers()
+  this.solve()
+  this.updateBoundingSpheres()
+
+  this.selected = []
+  this.obj3d.dispatchEvent({ type: 'change' })
+}
+
+
diff --git a/src/drawEvents.js b/src/drawEvents.js
index 3d78ca8..765a701 100644
--- a/src/drawEvents.js
+++ b/src/drawEvents.js
@@ -2,6 +2,7 @@
 import { drawArc, drawArc2 } from './drawArc'
 import { drawLine, drawLine2 } from './drawLine'
 // import { drawDimension } from "./drawDimension";
+import { ptObj } from './shared'
 
 export function drawOnClick1(e) {
   if (e.buttons !== 1) return
@@ -95,3 +96,16 @@ export function drawClear() {
     this.toPush = []
   }
 }
+
+
+export function drawPoint(e) {
+
+  const mouseLoc = this.getLocation(e).toArray();
+  const p1 = ptObj()
+  p1.matrixAutoUpdate = false;
+  p1.userData.constraints = []
+  p1.geometry.attributes.position.set(mouseLoc)
+  this.obj3d.add(p1)
+  this.updatePointsBuffer()
+  this.obj3d.dispatchEvent({ type: 'change' })
+}
\ No newline at end of file
diff --git a/src/drawLine.js b/src/drawLine.js
index e1f8831..4f1f16d 100644
--- a/src/drawLine.js
+++ b/src/drawLine.js
@@ -33,6 +33,8 @@ export function drawLine(mouseLoc) {
     p1.userData.constraints.push(this.c_id)
     this.obj3d.children[this.obj3d.children.length - 2].userData.constraints.push(this.c_id)
 
+
+
   }
 
 
diff --git a/src/extrude.js b/src/extrude.js
index 3c47dc3..cdcadb7 100644
--- a/src/extrude.js
+++ b/src/extrude.js
@@ -64,7 +64,7 @@ export function extrude(sketch) {
   }
 
 
-  findPair(children[3]) //??? need fixing
+  findPair(children[4]) //??? need fixing
 
   const shape = new THREE.Shape(v2s);
   const extrudeSettings = { depth: 8, bevelEnabled: false };
diff --git a/src/patch.js b/src/patch.js
index b8ee71f..75e9d99 100644
--- a/src/patch.js
+++ b/src/patch.js
@@ -5,7 +5,10 @@
 
 import { LineSegments, MeshBasicMaterial, Float32BufferAttribute, BufferGeometry, Mesh, DoubleSide } from '../node_modules/three/src/Three'
 
-class Patch extends Mesh {
+
+import * as THREE from '../node_modules/three/src/Three';
+
+class Patch extends THREE.Mesh {
 
   constructor(s = 1) {
 
diff --git a/src/react/toolTip.jsx b/src/react/toolTip.jsx
index e3ae4f5..5620d8f 100644
--- a/src/react/toolTip.jsx
+++ b/src/react/toolTip.jsx
@@ -12,7 +12,7 @@ export const ToolTip = () => {
    * child mouseover is novel. If it's not, we ignore the event
    */
 
-  const [state, setState] = useState(null)
+  const [text, setText] = useState(null)
 
   const ref = useRef()
 
@@ -38,14 +38,11 @@ export const ToolTip = () => {
       prevTooltip.current = tooltip                       // svg workaround
 
       clearTimeout(timeout.current)
-
       if (tooltip) {
         let { left, top, width, height } = node.getBoundingClientRect()
         left = left + width / 2 - getTextWidth(tooltip) / 2 - 4 // 4 is padding
         top = top + height + 6 // 6 is arrow height/width
-
-        setState(tooltip)
-
+        setText(tooltip)
         if (activated.current) {
           ref.current.setAttribute('style', `left:${left}px; top:${top}px; visibility:visible`)
         } else {
@@ -54,22 +51,16 @@ export const ToolTip = () => {
             activated.current = true
           }, 1000);
         }
-
       } else {
-
         ref.current.setAttribute('style', `visibility:hidden`)
         activated.current = false
-
       }
-
     })
-
-
   }, [])
 
 
   return <div className="tooltip" ref={ref}>
-    {state}
+    {text}
     <div className="arrow"></div>
   </div>
 
@@ -77,6 +68,7 @@ export const ToolTip = () => {
 
 
 function getTextWidth(text, font = "16px sans-serif") {
+  // https://stackoverflow.com/a/21015393
   // re-use canvas object for better performance
   let canvas = getTextWidth.canvas || (getTextWidth.canvas = document.createElement("canvas"));
   let context = canvas.getContext("2d");
diff --git a/src/shared.js b/src/shared.js
index 828cad4..1603783 100644
--- a/src/shared.js
+++ b/src/shared.js
@@ -7,8 +7,8 @@ const _vec3 = new THREE.Vector3()
 
 
 const raycaster = new THREE.Raycaster();
-raycaster.params.Line.threshold = 0.8;
-raycaster.params.Points.threshold = 0.6;
+raycaster.params.Line.threshold = 0.1;
+raycaster.params.Points.threshold = 0.1;
 
 
 const color = {
diff --git a/src/sketchAxes.js b/src/sketchAxes.js
index 741f5f2..d9d983b 100644
--- a/src/sketchAxes.js
+++ b/src/sketchAxes.js
@@ -11,7 +11,7 @@ class AxesHelper extends LineSegments {
 
     const vertices = [
       0, 0, 0, 0.5 * s, 0, 0,
-      0.5 * s, 0, 0, 0.35 * s, 0.08*s, 0,
+      0.5 * s, 0, 0, 0.3 * s, 0.08*s, 0,
 
       0, 0, 0, 0, s, 0,
     ];
@@ -20,7 +20,7 @@ class AxesHelper extends LineSegments {
     const geometry = new BufferGeometry();
     geometry.setAttribute('position', new Float32BufferAttribute(vertices, 3));
 
-    const material = new LineBasicMaterial({ color: 0xff0000, toneMapped: false });
+    const material = new LineBasicMaterial({ color: 0xff0000, toneMapped: false, linewidth:2 });
 
     super(geometry, material);
 
diff --git a/wasm/solver.c b/wasm/solver.c
index 34881f3..22ce85a 100644
--- a/wasm/solver.c
+++ b/wasm/solver.c
@@ -69,18 +69,16 @@ int solver(int nPts, float *p_ptr, int nConst, float *c_ptr, int nLinks, float *
   Slvs_hParam vh = 301, vh_s = 301;
   Slvs_hParam lh = 400, lh_s = 400;
 
-  Slvs_hParam con_id = 1;
-
   float *buf_pt_start = p_ptr;
   int p_start = sys.params;
   for (int i = 0; i < nPts; i++)
   {
     if (isnan((float)*p_ptr))
     {
-      // printf("%i\n",i);
       p_ptr += 3;
       continue;
     }
+
     sys.param[sys.params++] = Slvs_MakeParam(ph++, g, (float)*p_ptr++);
     sys.param[sys.params++] = Slvs_MakeParam(ph++, g, (float)*p_ptr++);
     sys.entity[sys.entities++] = Slvs_MakePoint2d(i, g, 200, ph - 1, ph - 2);
@@ -93,13 +91,10 @@ int solver(int nPts, float *p_ptr, int nConst, float *c_ptr, int nLinks, float *
     switch ((int)*l_ptr++)
     {
     case 0:
-      // printf("matching %i\n",(int)*(l_ptr + 2));
       sys.entity[sys.entities++] = Slvs_MakeLineSegment((int)*(l_ptr + 2), g,
                                                         200, (int)*l_ptr, (int)*(l_ptr + 1));
       break;
     case 1:
-      /* And arc, centered at point 303, starting at point 304, ending at
-     * point 305. */
       sys.entity[sys.entities++] = Slvs_MakeArcOfCircle((int)*(l_ptr + 3), g, 200, 102,
                                                         (int)*(l_ptr + 2), (int)*(l_ptr), (int)*(l_ptr + 1));
       break;
@@ -110,11 +105,17 @@ int solver(int nPts, float *p_ptr, int nConst, float *c_ptr, int nLinks, float *
     l_ptr += 4;
   }
 
-  for (int i = 0; i < nConst; i++, c_ptr += 6)
+  int c_id = 1;
+  sys.constraint[sys.constraints++] = Slvs_MakeConstraint(
+      c_id++, 2,
+      SLVS_C_POINTS_COINCIDENT,
+      200,
+      -1,
+      101, 3, -1, -1);
+  for (; c_id < 2 + nConst; c_id++, c_ptr += 6)
   {
-    // printf("%i here %i\n",(int)*c_ptr, nConst);
     sys.constraint[sys.constraints++] = Slvs_MakeConstraint(
-        con_id++, g,
+        c_id, g,
         (int)*c_ptr + 100000,
         200,
         *(c_ptr + 1),