diff --git a/src/game-lib-component-trigger-box-sphere.js b/src/game-lib-component-trigger-box-sphere.js
new file mode 100644
index 0000000..8ac3d7f
--- /dev/null
+++ b/src/game-lib-component-trigger-box-sphere.js
@@ -0,0 +1,89 @@
+//
+// this component operates on it's parent entity's bounding box.
+// so, you can't use this component with a null-mesh.
+//
+GameLib.D3.ComponentTriggerBoxSphere = function(
+    componentId,
+    entitiesToCheck,
+    callback
+) {
+    this.componentId = componentId || GameLib.D3.Tools.RandomId();
+    this.parentEntity = null;
+
+    // Todo: this should be executed somewhere in game-lib-z, so that we don't execute it on every construction of an object.
+    GameLib.D3.Utils.Extend(GameLib.D3.ComponentTriggerBoxSphere, GameLib.D3.ComponentInterface);
+
+    this.entitiesToCheck = entitiesToCheck || [];
+    this.callback = callback || null;
+};
+
+if(typeof THREE != "undefined") {
+    ComponentTriggerBoxSphere_BoxInverseTransform = new THREE.Matrix4();
+    ComponentTriggerBoxSphere_TargetPosition_Vec3 = new THREE.Vector3();
+    ComponentTriggerBoxSphere_TargetRadius = 0.0;
+}
+
+///////////////////////// Methods to override //////////////////////////
+GameLib.D3.ComponentTriggerBoxSphere.prototype.onUpdate = function(
+    deltaTime,
+    parentEntity
+) {
+
+    if(parentEntity.mesh) {
+        // Calculate the current transform here, using the position, orientation and scale of the entity.
+
+        if(!parentEntity.mesh.geometry.boundingBox) {
+            parentEntity.mesh.geometry.computeBoundingBox();
+        }
+
+        ComponentTriggerBoxSphere_BoxInverseTransform.getInverse(parentEntity.mesh.matrix);
+
+        for(var e in this.entitiesToCheck) {
+            var entityToCheck = this.entitiesToCheck[e];
+
+            if(entityToCheck.mesh) {
+
+                if (!entityToCheck.mesh.geometry.boundingSphere) {
+                    entityToCheck.mesh.geometry.computeBoundingSphere();
+                }
+
+                var spherePosition = new THREE.Vector3(
+                    entityToCheck.position.x,
+                    entityToCheck.position.y,
+                    entityToCheck.position.z
+                );
+
+                spherePosition.applyMatrix4(ComponentTriggerBoxSphere_BoxInverseTransform);
+
+                var sphere = new THREE.Sphere(
+                    spherePosition,
+                    entityToCheck.mesh.geometry.boundingSphere.radius
+                );
+
+                if(this.callback && parentEntity.mesh.geometry.boundingBox.intersectsSphere(sphere)) {
+                    this.callback(parentEntity, entityToCheck);
+                }
+
+            } else { // no target mesh geometry.
+
+                var spherePosition = new THREE.Vector3(
+                    entityToCheck.position.x,
+                    entityToCheck.position.y,
+                    entityToCheck.position.z
+                );
+
+                spherePosition.applyMatrix4(ComponentTriggerBoxSphere_BoxInverseTransform);
+
+                var sphere = new THREE.Sphere(
+                    spherePosition,
+                    1
+                );
+
+                if(this.callback && parentEntity.mesh.geometry.boundingBox.intersectsSphere(sphere)) {
+                    this.callback(parentEntity, entityToCheck);
+                }
+
+            }
+        }
+    }
+};
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