diff --git a/sjplayer/src/sjplayer/CircleElementScheduledController.d b/sjplayer/src/sjplayer/CircleElementScheduledController.d
index 10af18e..55e6ed8 100644
--- a/sjplayer/src/sjplayer/CircleElementScheduledController.d
+++ b/sjplayer/src/sjplayer/CircleElementScheduledController.d
@@ -11,6 +11,7 @@ import sjplayer.CircleElement,
        sjplayer.ScheduledControllerFactory,
        sjplayer.ScheduledControllerInterface,
        sjplayer.VarStoreInterface,
+       sjplayer.util.MatrixFactory,
        sjplayer.util.Parameter;
 
 ///
@@ -35,8 +36,15 @@ class CircleElementScheduledController :
     element_.weight       = 1;
     element_.smooth       = 0.01;
     element_.color        = vec4(1, 1, 1, 1);
+
+    matrix_factory_ = matrix_factory_.init;
+
     super.PrepareOperation(params);
   }
+  override void ProcessOperation(float time, ref in ParametersBlock params) {
+    super.ProcessOperation(time, params);
+    element_.matrix = matrix_factory_.Create().transposed;
+  }
   override void FinalizeOperation(ref in ParametersBlock params) {
     element_.alive = false;
   }
@@ -44,17 +52,21 @@ class CircleElementScheduledController :
   override void SetParameter(Nullable!float time, ref in Parameter param) {
     auto vars = VarStore(this, time);
     switch (param.name) {
-      case "damage":       return element_.damage.      CalculateParameter(param, vars);
-      case "nearness_coe": return element_.nearness_coe.CalculateParameter(param, vars);
-      case "weight":       return element_.weight.      CalculateParameter(param, vars);
-      case "smooth":       return element_.smooth.      CalculateParameter(param, vars);
-
-      default: return super.SetParameter(time, param);
+      case "damage":       return param.CalculateParameter(element_.damage,       vars);
+      case "nearness_coe": return param.CalculateParameter(element_.nearness_coe, vars);
+      case "weight":       return param.CalculateParameter(element_.weight,       vars);
+      case "smooth":       return param.CalculateParameter(element_.smooth,       vars);
+      default:
     }
+    if (param.CalculateMatrixParameter(matrix_factory_, vars)) return;
+
+    return super.SetParameter(time, param);
   }
 
  private:
   CircleElement element_;
+
+  MatrixFactory matrix_factory_;
 }
 
 ///
diff --git a/sjplayer/src/sjplayer/ScheduledControllerInterface.d b/sjplayer/src/sjplayer/ScheduledControllerInterface.d
index 244bd99..eb4c40e 100644
--- a/sjplayer/src/sjplayer/ScheduledControllerInterface.d
+++ b/sjplayer/src/sjplayer/ScheduledControllerInterface.d
@@ -111,8 +111,7 @@ abstract class AbstractScheduledControllerWithOperationImpl :
     (param.name.length >= 2 && param.name[0..2] == "__").
       enforce("user defined variables must be prefixed '__'");
     user_vars_[param.name] = 0;
-    user_vars_[param.name].
-      CalculateParameter(param, VarStore(this, time));
+    param.CalculateParameter(user_vars_[param.name], VarStore(this, time));
   }
 
  private:
diff --git a/sjplayer/src/sjplayer/util/MatrixFactory.d b/sjplayer/src/sjplayer/util/MatrixFactory.d
new file mode 100644
index 0000000..11a99eb
--- /dev/null
+++ b/sjplayer/src/sjplayer/util/MatrixFactory.d
@@ -0,0 +1,26 @@
+/// License: MIT
+module sjplayer.util.MatrixFactory;
+
+import gl4d;
+
+///
+struct MatrixFactory {
+ public:
+  ///
+  @property mat3 Create() const {
+    auto m = mat3.identity;
+    m.scale(scale.x, scale.y, scale.z);
+    m.rotatex(rotation.x);
+    m.rotatey(rotation.y);
+    m.rotatez(rotation.z);
+    m.translate(translation.x, translation.y, translation.z);
+    return m;
+  }
+
+  ///
+  vec3 scale = vec3(1, 1, 1);
+  ///
+  vec3 rotation = vec3(0, 0, 0);
+  ///
+  vec3 translation = vec3(0, 0, 0);
+}
diff --git a/sjplayer/src/sjplayer/util/Parameter.d b/sjplayer/src/sjplayer/util/Parameter.d
index 6c35eeb..132066a 100644
--- a/sjplayer/src/sjplayer/util/Parameter.d
+++ b/sjplayer/src/sjplayer/util/Parameter.d
@@ -3,10 +3,44 @@ module sjplayer.util.Parameter;
 
 import sjscript;
 
+import sjplayer.util.MatrixFactory;
+
 ///
 void CalculateParameter(T)(
-    ref float value, in Parameter param, T vars) {
+    in Parameter param, ref float value, T vars) {
   auto result = param.rhs.CalculateExpression(vars);
   if (param.type == ParameterType.AddAssign) result += value;
   value = result;
 }
+
+///
+bool CalculateMatrixParameter(T)(
+    in Parameter param, ref MatrixFactory m, T vars) {
+  switch (param.name) {
+    case "translation_x":
+      param.CalculateParameter(m.translation.x, vars);
+      return true;
+    case "translation_y":
+      param.CalculateParameter(m.translation.y, vars);
+      return true;
+
+    case "rotation_x":
+      param.CalculateParameter(m.rotation.x, vars);
+      return true;
+    case "rotation_y":
+      param.CalculateParameter(m.rotation.y, vars);
+      return true;
+    case "rotation_z":
+      param.CalculateParameter(m.rotation.z, vars);
+      return true;
+
+    case "scale_x":
+      param.CalculateParameter(m.scale.x, vars);
+      return true;
+    case "scale_y":
+      param.CalculateParameter(m.scale.y, vars);
+      return true;
+
+    default: return false;
+  }
+}