diff --git a/src/alternativa/engine3d/core/Camera3D.as b/src/alternativa/engine3d/core/Camera3D.as
index 9f0a18e..50de4ca 100644
--- a/src/alternativa/engine3d/core/Camera3D.as
+++ b/src/alternativa/engine3d/core/Camera3D.as
@@ -46,6 +46,12 @@ package alternativa.engine3d.core {
  */
 public class Camera3D extends Object3D {
 
+	/**
+	 * @private
+	 * Key - context, value - properties.
+	 */
+	alternativa3d static var context3DPropertiesPool:Dictionary = new Dictionary(true);
+
 	/**
 	 * The viewport defines part of screen to which renders image seen by the camera.
 	 * If viewport is not defined, the camera would not draws anything.
@@ -156,6 +162,11 @@ public class Camera3D extends Object3D {
 	 */
 	alternativa3d var context3D:Context3D;
 
+	/**
+	 * @private
+	 */
+	alternativa3d var context3DProperties:RendererContext3DProperties;
+
 	/**
 	 * @private
 	 * Camera's renderer. If is not defined, the camera will no draw anything.
@@ -195,7 +206,6 @@ public class Camera3D extends Object3D {
 	 * @param stage3D  <code>Stage3D</code> to which image will be rendered.
 	 */
 	public function render(stage3D:Stage3D):void {
-		// TODO: don't check mouse events if no listeners
 		var i:int;
 		var j:int;
 		var light:Light3D;
@@ -214,11 +224,26 @@ public class Camera3D extends Object3D {
 		ambient[2] = 0;
 		ambient[3] = 1;
 		// Receiving the context
-		context3D = stage3D.context3D;
+		var currentContext3D:Context3D = stage3D.context3D;
+		if (currentContext3D != context3D) {
+			if (currentContext3D != null) {
+				context3DProperties = context3DPropertiesPool[currentContext3D];
+				if (context3DProperties == null) {
+					context3DProperties = new RendererContext3DProperties();
+					context3DProperties.isConstrained = currentContext3D.driverInfo.lastIndexOf("(Baseline Constrained)") >= 0;
+					context3DPropertiesPool[currentContext3D] = context3DProperties;
+				}
+				context3D = currentContext3D;
+			} else {
+				context3D = null;
+				context3DProperties = null;
+			}
+		}
 		if (context3D != null && view != null && renderer != null && (view.stage != null || view._canvas != null)) {
 			renderer.camera = this;
 			// Projection argument calculating
 			calculateProjection(view._width, view._height);
+			// TODO: clear after shadows rendering
 			// Preparing to rendering
 			view.prepareToRender(stage3D, context3D);
 			// Transformations calculating
@@ -403,7 +428,6 @@ public class Camera3D extends Object3D {
 		lights.length = 0;
 		childLights.length = 0;
 		occluders.length = 0;
-		context3D = null;
 	}
 	
 	/**
diff --git a/src/alternativa/engine3d/core/Renderer.as b/src/alternativa/engine3d/core/Renderer.as
index 211bad2..77fae35 100644
--- a/src/alternativa/engine3d/core/Renderer.as
+++ b/src/alternativa/engine3d/core/Renderer.as
@@ -16,7 +16,6 @@ package alternativa.engine3d.core {
 	import flash.display3D.Context3DProgramType;
 	import flash.display3D.IndexBuffer3D;
 	import flash.display3D.Program3D;
-	import flash.utils.Dictionary;
 
 	use namespace alternativa3d;
 
@@ -37,9 +36,6 @@ package alternativa.engine3d.core {
 
 		public static const NEXT_LAYER:int = 50;
 
-		// Key - context, value - properties.
-		protected static var properties:Dictionary = new Dictionary(true);
-
 		// Collector
 		protected var collector:DrawUnit;
 
@@ -47,9 +43,6 @@ package alternativa.engine3d.core {
 
 		alternativa3d var drawUnits:Vector.<DrawUnit> = new Vector.<DrawUnit>();
 
-		alternativa3d var isConstrainedMode:Boolean = false;
-
-		protected var _context3D:Context3D;
 		protected var _contextProperties:RendererContext3DProperties;
 
 		alternativa3d function render(context3D:Context3D):void {
@@ -61,29 +54,29 @@ package alternativa.engine3d.core {
 				if (list != null) {
 					switch (i) {
 						case SKY:
-							_context3D.setDepthTest(false, Context3DCompareMode.ALWAYS);
+							context3D.setDepthTest(false, Context3DCompareMode.ALWAYS);
 							break;
 						case OPAQUE:
-							_context3D.setDepthTest(true, Context3DCompareMode.LESS);
+							context3D.setDepthTest(true, Context3DCompareMode.LESS);
 							break;
 						case OPAQUE_OVERHEAD:
-							_context3D.setDepthTest(false, Context3DCompareMode.EQUAL);
+							context3D.setDepthTest(false, Context3DCompareMode.EQUAL);
 							break;
 						case DECALS:
-							_context3D.setDepthTest(false, Context3DCompareMode.LESS_EQUAL);
+							context3D.setDepthTest(false, Context3DCompareMode.LESS_EQUAL);
 							break;
 						case TRANSPARENT_SORT:
 							if (list.next != null) list = sortByAverageZ(list);
-							_context3D.setDepthTest(false, Context3DCompareMode.LESS);
+							context3D.setDepthTest(false, Context3DCompareMode.LESS);
 							break;
 						case NEXT_LAYER:
-							_context3D.setDepthTest(false, Context3DCompareMode.ALWAYS);
+							context3D.setDepthTest(false, Context3DCompareMode.ALWAYS);
 							break;
 					}
 					// Rendering
 					while (list != null) {
 						var next:DrawUnit = list.next;
-						renderDrawUnit(list, _context3D, camera);
+						renderDrawUnit(list, context3D, camera);
 						// Send to collector
 						list.clear();
 						list.next = collector;
@@ -92,6 +85,7 @@ package alternativa.engine3d.core {
 					}
 				}
 			}
+			// TODO: not free buffers and textures in each renderer, only when full camera cycle finishes.
 			freeContext3DProperties(context3D);
 			// Clear
 			drawUnits.length = 0;
@@ -182,15 +176,7 @@ package alternativa.engine3d.core {
 		}
 
 		protected function updateContext3D(value:Context3D):void {
-			if (_context3D != value) {
-				_contextProperties = properties[value];
-				if (_contextProperties == null) {
-					_contextProperties = new RendererContext3DProperties();
-					properties[value] = _contextProperties;
-				}
-				_context3D = value;
-				isConstrainedMode = _context3D.driverInfo.lastIndexOf("(Baseline Constrained)") >= 0;
-			}
+			_contextProperties = camera.context3DProperties;
 		}
 
 		/**
diff --git a/src/alternativa/engine3d/core/RendererContext3DProperties.as b/src/alternativa/engine3d/core/RendererContext3DProperties.as
index a92aad0..4c2fabe 100644
--- a/src/alternativa/engine3d/core/RendererContext3DProperties.as
+++ b/src/alternativa/engine3d/core/RendererContext3DProperties.as
@@ -16,6 +16,8 @@ package alternativa.engine3d.core {
 	 */
 	public class RendererContext3DProperties {
 
+		public var isConstrained:Boolean = false;
+
 		public var usedBuffers:uint = 0;
 		public var usedTextures:uint = 0;
 
diff --git a/src/alternativa/engine3d/materials/EnvironmentMaterial.as b/src/alternativa/engine3d/materials/EnvironmentMaterial.as
index 276044d..24dcb83 100644
--- a/src/alternativa/engine3d/materials/EnvironmentMaterial.as
+++ b/src/alternativa/engine3d/materials/EnvironmentMaterial.as
@@ -825,7 +825,7 @@ package alternativa.engine3d.materials {
 			if (_reflectionMap != null && _reflectionMap._texture == null) return;
 			if (_lightMap != null && _lightMap._texture == null) return;
 
-			if (camera.renderer.isConstrainedMode) {
+			if (camera.context3DProperties.isConstrained) {
 				// fallback to simpler material
 				if (lightMap == null) {
 					fallbackTextureMaterial.diffuseMap = diffuseMap;
diff --git a/src/alternativa/engine3d/materials/StandardMaterial.as b/src/alternativa/engine3d/materials/StandardMaterial.as
index 3cb1022..f451c23 100644
--- a/src/alternativa/engine3d/materials/StandardMaterial.as
+++ b/src/alternativa/engine3d/materials/StandardMaterial.as
@@ -995,7 +995,7 @@ package alternativa.engine3d.materials {
 			// Check if textures uploaded in to the context.
 			if (opacityMap != null && opacityMap._texture == null || glossinessMap != null && glossinessMap._texture == null || specularMap != null && specularMap._texture == null || lightMap != null && lightMap._texture == null) return;
 
-			if (camera.renderer.isConstrainedMode) {
+			if (camera.context3DProperties.isConstrained) {
 				// fallback to simpler material
 				if (lightMap == null) {
 					fallbackTextureMaterial.diffuseMap = diffuseMap;
diff --git a/src/alternativa/engine3d/materials/VertexLightTextureMaterial.as b/src/alternativa/engine3d/materials/VertexLightTextureMaterial.as
index 57efd3f..ceb0664 100644
--- a/src/alternativa/engine3d/materials/VertexLightTextureMaterial.as
+++ b/src/alternativa/engine3d/materials/VertexLightTextureMaterial.as
@@ -287,7 +287,7 @@ package alternativa.engine3d.materials {
 		override alternativa3d function collectDraws(camera:Camera3D, surface:Surface, geometry:Geometry, lights:Vector.<Light3D>, lightsLength:int, useShadow:Boolean, objectRenderPriority:int = -1):void {
 			if (diffuseMap == null || diffuseMap._texture == null || opacityMap != null && opacityMap._texture == null) return;
 
-			if (camera.renderer.isConstrainedMode) {
+			if (camera.context3DProperties.isConstrained) {
 				// fallback to texture material
 				fallbackMaterial.diffuseMap = diffuseMap;
 				fallbackMaterial.opacityMap = opacityMap;
diff --git a/src/alternativa/engine3d/objects/LOD.as b/src/alternativa/engine3d/objects/LOD.as
index 487da9c..04d38a0 100644
--- a/src/alternativa/engine3d/objects/LOD.as
+++ b/src/alternativa/engine3d/objects/LOD.as
@@ -176,6 +176,7 @@ package alternativa.engine3d.objects {
 		 * @private
 		 */
 		override alternativa3d function calculateVisibility(camera:Camera3D):void {
+			// TODO: optimize - use square of distance
 			var distance:Number = Math.sqrt(localToCameraTransform.d*localToCameraTransform.d + localToCameraTransform.h*localToCameraTransform.h + localToCameraTransform.l*localToCameraTransform.l);
 			for (level = levelList; level != null; level = level.next) {
 				if (distance <= level.distance) {