Change permeable name to sensors, add isSensor to Pair

README.md

@@ -58,6 +58,7 @@
         <li><a href="http://brm.io/matter-js-demo-master#beachBalls">Beach Balls</a></li>
         <li><a href="http://brm.io/matter-js-demo-master#stress">Stress 1</a></li>
         <li><a href="http://brm.io/matter-js-demo-master#stress2">Stress 2</a></li>
+        <li><a href="http://brm.io/matter-js-demo#sensors">Sensors</a></li>
       </ul>
       <br>
     </td>
@@ -95,6 +96,7 @@ See how others are using matter.js physics
 - Constraints
 - Gravity
 - Sleeping and static bodies
+- Sensors
 - Rounded corners (chamfering)
 - Views (translate, zoom)
 - Collision queries (raycasting, region tests)

demo/index.html

@@ -74,7 +74,7 @@ <h1>Matter.js Demo (Edge Build)</h1>
                     <option value="beachBalls">Beach Balls</option>
                     <option value="stress">Stress 1</option>
                     <option value="stress2">Stress 2</option>
-                    <option value="permeableObjects">Permeable Objects</option>
+                    <option value="sensors">Sensors</option>
                 </select>
                 <input id="demo-reset" value="Reset" type="submit">
                 <div class="demo-view-source nav-links">

examples/permeableObjects.js → examples/sensors.js

@@ -5,7 +5,7 @@
         Common = Matter.Common,
         Events = Matter.Events;
 
-    Example.permeableObjects = function(demo) {
+    Example.sensors = function(demo) {
         var engine = demo.engine,
             world = engine.world,
             sceneEvents = demo.sceneEvents;
@@ -14,7 +14,7 @@
             greenColor = '#C7F464';
 
         var collider = Bodies.rectangle(400, 300, 500, 50, {
-            isPermeable: true,
+            isSensor: true,
             isStatic: true,
             render: {
                 strokeStyle: redColor,

src/body/Body.js

@@ -53,7 +53,7 @@ var Axes = require('../geometry/Axes');
             angularSpeed: 0,
             velocity: { x: 0, y: 0 },
             angularVelocity: 0,
-            isPermeable: false,
+            isSensor: false,
             isStatic: false,
             isSleeping: false,
             motion: 0,
@@ -789,9 +789,9 @@ var Axes = require('../geometry/Axes');
      */
 
     /**
-     * A flag that indicates whether a body is considered permeable. A permeable body triggers collision events, but doesn't react with colliding body physically.
+     * A flag that indicates whether a body is a sensor. Sensor triggers collision events, but doesn't react with colliding body physically.
      *
-     * @property isPermeable
+     * @property isSensor
      * @type boolean
      * @default false
      */

src/collision/Pair.js

@@ -33,6 +33,7 @@ var Contact = require('./Contact');
             activeContacts: [],
             separation: 0,
             isActive: true,
+            isSensor: bodyA.isSensor || bodyB.isSensor,
             timeCreated: timestamp,
             timeUpdated: timestamp,
             inverseMass: parentA.inverseMass + parentB.inverseMass,

src/collision/Resolver.js

@@ -70,16 +70,13 @@ var Bounds = require('../geometry/Bounds');
         for (i = 0; i < pairs.length; i++) {
             pair = pairs[i];
 
-            if (!pair.isActive)
+            if (!pair.isActive || pair.isSensor)
                 continue;
 
             collision = pair.collision;
             bodyA = collision.parentA;
             bodyB = collision.parentB;
             normal = collision.normal;
-
-            if (bodyA.isPermeable || bodyB.isPermeable)
-                continue;
 
             // get current separation between body edges involved in collision
             bodyBtoA = Vector.sub(Vector.add(bodyB.positionImpulse, bodyB.position, tempA), 
@@ -92,17 +89,14 @@ var Bounds = require('../geometry/Bounds');
         for (i = 0; i < pairs.length; i++) {
             pair = pairs[i];
 
-            if (!pair.isActive || pair.separation < 0)
+            if (!pair.isActive || pair.isSensor || pair.separation < 0)
                 continue;
 
             collision = pair.collision;
             bodyA = collision.parentA;
             bodyB = collision.parentB;
             normal = collision.normal;
             positionImpulse = (pair.separation - pair.slop) * timeScale;
-
-            if (bodyA.isPermeable || bodyB.isPermeable)
-                continue;
 
             if (bodyA.isStatic || bodyB.isStatic)
                 positionImpulse *= 2;
@@ -186,7 +180,7 @@ var Bounds = require('../geometry/Bounds');
         for (i = 0; i < pairs.length; i++) {
             pair = pairs[i];
 
-            if (!pair.isActive)
+            if (!pair.isActive || pair.isSensor)
                 continue;
 
             contacts = pair.activeContacts;
@@ -195,9 +189,6 @@ var Bounds = require('../geometry/Bounds');
             bodyB = collision.parentB;
             normal = collision.normal;
             tangent = collision.tangent;
-
-            if (bodyA.isPermeable || bodyB.isPermeable)
-                continue;
 
             // resolve each contact
             for (j = 0; j < contacts.length; j++) {
@@ -248,7 +239,7 @@ var Bounds = require('../geometry/Bounds');
         for (var i = 0; i < pairs.length; i++) {
             var pair = pairs[i];
 
-            if (!pair.isActive)
+            if (!pair.isActive || pair.isSensor)
                 continue;
 
             var collision = pair.collision,
@@ -259,9 +250,6 @@ var Bounds = require('../geometry/Bounds');
                 contacts = pair.activeContacts,
                 contactShare = 1 / contacts.length;
 
-            if (bodyA.isPermeable || bodyB.isPermeable)
-                continue;
-
             // update body velocities
             bodyA.velocity.x = bodyA.position.x - bodyA.positionPrev.x;
             bodyA.velocity.y = bodyA.position.y - bodyA.positionPrev.y;