fixes #186

src/client/js/rendering/particles.js

@@ -38,12 +38,14 @@ define([
 		},
 
 		update: function() {
+			var renderer = this.r;
 			var now = Date.now();
 
 			var emitters = this.emitters;
 			var eLen = emitters.length;
 			for (var i = 0; i < eLen; i++) {
 				var e = emitters[i];
+
 				var destroy = ((!e.emit) && (e.particleCount == 0));
 
 				if (destroy) {
@@ -56,6 +58,9 @@ define([
 					continue;
 				} 
 
+				if (!renderer.isVisible(e.spawnPos.x, e.spawnPos.y))
+					continue;
+
 				var r = e.update((now - this.lastTick) * 0.001);
 				r.forEach(function(rr) {
 					if (e.blendMode == 'overlay')

src/client/js/rendering/renderer.js

@@ -473,6 +473,16 @@ define([
             this.updateSprites();
         },
 
+        isVisible: function(x, y) {
+            var sx = -this.stage.x;
+            var sy = -this.stage.y;
+
+            var sw = this.width;
+            var sh = this.height;
+
+            return (!((x < sx) || (y < sy) || (x >= sx + sw) || (y >= sy + sh)));
+        },
+
         updateSprites: function() {
             if (this.titleScreen)
                 return;