diff --git a/examples/d3d/src/d3d.d b/examples/d3d/src/d3d.d
index 0969f8b7..a7392712 100644
--- a/examples/d3d/src/d3d.d
+++ b/examples/d3d/src/d3d.d
@@ -9,6 +9,7 @@ import dlangui.graphics.scene.effect;
 import dlangui.graphics.scene.model;
 import dlangui.graphics.scene.node;
 import dlangui.graphics.scene.objimport;
+import dlangui.graphics.scene.light;
 import dlangui.graphics.glsupport;
 import dlangui.graphics.gldrawbuf;
 import derelict.opengl3.gl3;
@@ -113,6 +114,12 @@ class UiWidget : VerticalLayout, CellVisitor {
 
         _scene.activeCamera = _cam;
 
+        Node3d dirLightNode = new Node3d();
+        dirLightNode.rotateY(-15);
+        dirLightNode.rotateX(20);
+        dirLightNode.light = Light.createDirectional(vec3(1, 0.5, 0.5));
+        _scene.addChild(dirLightNode);
+
         int x0 = 0;
         int y0 = 0;
         int z0 = 0;
diff --git a/src/dlangui/graphics/scene/effect.d b/src/dlangui/graphics/scene/effect.d
index c0c0b859..f6800100 100644
--- a/src/dlangui/graphics/scene/effect.d
+++ b/src/dlangui/graphics/scene/effect.d
@@ -160,8 +160,10 @@ class EffectCache {
     }
 
     static private void onObjectDestroyed(EffectId id) {
-        if (id in _instance._map)
+        if (id in _instance._map) {
+            Log.d("Destroyed effect instance: ", id);
             _instance._map.remove(id);
+        }
     }
 
     /// get effect from cache or create new if not exist
@@ -175,6 +177,7 @@ class EffectCache {
             return *p;
         }
         Effect e = new Effect(id);
+        Log.d("New effect instance: ", id);
         _map[id] = e;
         return e;
     }
@@ -192,6 +195,21 @@ struct EffectId {
         definitions = defs;
     }
 
+    this(ref EffectId v, string additionalParams) {
+        import std.string : empty;
+        vertexShaderName = v.vertexShaderName;
+        fragmentShaderName = v.fragmentShaderName;
+        definitions = v.definitions;
+        if (!additionalParams.empty) {
+            if (!definitions.empty) {
+                definitions ~= ";";
+                definitions ~= additionalParams;
+            } else {
+                definitions = additionalParams;
+            }
+        }
+    }
+
     /// returns true if ID is not assigned
     @property bool empty() {
         return !vertexShaderName.length || !vertexShaderName.length;
diff --git a/src/dlangui/graphics/scene/light.d b/src/dlangui/graphics/scene/light.d
index 47f2a2f0..e2d540a9 100644
--- a/src/dlangui/graphics/scene/light.d
+++ b/src/dlangui/graphics/scene/light.d
@@ -126,7 +126,7 @@ struct Lights {
         point.length = 0;
         spot.length = 0;
     }
-    @property bool empty() const { return directional.length + point.length + spot.length > 0; }
+    @property bool empty() const { return directional.length + point.length + spot.length == 0; }
     /// returns point types by type
     @property LightCounts counts() const { return [cast(int)directional.length, cast(int)point.length, cast(int)spot.length]; }
     @property int directionalCount() const { return cast(int)directional.length; }
@@ -136,7 +136,8 @@ struct Lights {
     @property string defs() const {
         if (!directional.length && !point.length && !spot.length)
             return null;
-        char[] buf;
+        static __gshared char[] buf;
+        buf.length = 0; // reset buffer
         if (directional.length) {
             buf ~= "DIRECTIONAL_LIGHT_COUNT ";
             buf ~= directional.length.to!string;
@@ -153,7 +154,7 @@ struct Lights {
             buf ~= "SPOT_LIGHT_COUNT ";
             buf ~= spot.length.to!string;
         }
-        return cast(string)buf;
+        return buf.dup;
     }
     void remove(Light light) {
         import std.algorithm : remove;
@@ -227,6 +228,7 @@ struct LightParams {
     Lights _lights;
 
     @property bool empty() const { return _lights.empty; }
+    @property string defs() const { return _lights.defs; }
 
     void reset() {
         _lights.reset();
diff --git a/src/dlangui/graphics/scene/material.d b/src/dlangui/graphics/scene/material.d
index 9940617e..ef1ee84f 100644
--- a/src/dlangui/graphics/scene/material.d
+++ b/src/dlangui/graphics/scene/material.d
@@ -18,6 +18,8 @@ class Material : RefCountedObject {
     // effect
     protected EffectRef _effect;
     protected EffectId _effectId;
+    protected string _autoEffectParams;
+    protected EffectId _autoEffectId;
 
     // textures
     protected TextureRef _texture;
@@ -36,6 +38,8 @@ class Material : RefCountedObject {
 
     this(EffectId effectId, string textureId) {
         _effectId = effectId;
+        _autoEffectParams = null;
+        _autoEffectId = effectId;
         _textureId = textureId;
     }
 
@@ -49,8 +53,8 @@ class Material : RefCountedObject {
     @property Material modulateColor(float a) { _modulateAlpha = a; return this; }
 
     @property EffectRef effect() {
-        if (_effect.isNull && !_effectId.empty)
-            _effect = EffectCache.instance.get(_effectId); 
+        if (_effect.isNull && !_autoEffectId.empty)
+            _effect = EffectCache.instance.get(_autoEffectId);
         return _effect;
     }
     /// set as effect instance
@@ -63,10 +67,20 @@ class Material : RefCountedObject {
         if (_effectId == effectId)
             return this; // no change
         _effectId = effectId; 
+        _autoEffectId = EffectId(_effectId, _autoEffectParams);
         _effect.clear();
         return this;
     }
 
+    protected @property Material autoEffectParams(string params) {
+        if (_autoEffectParams != params && !_effectId.empty) {
+            _autoEffectId = EffectId(_effectId, params);
+            _autoEffectParams = params;
+            _effect.clear();
+        }
+        return this;
+    }
+
     @property TextureRef texture() { 
         if (_texture.isNull && _textureId.length) {
             _texture = GLTextureCache.instance.get(_textureId);
@@ -87,7 +101,14 @@ class Material : RefCountedObject {
         return this;
     }
 
+    string calcAutoEffectParams(LightParams * lights) {
+        if (!lights || lights.empty)
+            return null;
+        return lights.defs;
+    }
+
     void bind(Node3d node, LightParams * lights = null) {
+        autoEffectParams = calcAutoEffectParams(lights);
         assert(!effect.isNull);
         effect.bind();
         if (!texture.isNull) {