new actions:

ActionFadeIn.cs
ActionFadeOut.cs
ActionFadeTo.cs

README.md

@@ -35,9 +35,9 @@ Interval actions
 - [x]  ScaleBy
 - [x]  TintBy *if you want to manipulate alpha, your material must support transparency*
 - [x]  TintTo *if you want to manipulate alpha, your material must support transparency*
-- [ ]  FadeOut *if you want to manipulate alpha, your material must support transparency*
-- [ ]  FadeIn *if you want to manipulate alpha, your material must support transparency*
-- [ ]  FadeTo *if you want to manipulate alpha, your material must support transparency*
+- [x]  FadeOut *if you want to manipulate alpha, your material must support transparency*
+- [x]  FadeIn *if you want to manipulate alpha, your material must support transparency*
+- [x]  FadeTo *if you want to manipulate alpha, your material must support transparency*
 - [x]  FadeBy *if you want to manipulate alpha, your material must support transparency*
 - [ ]  JumpTo 
 - [ ]  JumpBy

src/ActionsInterval/ActionFadeBy.cs

@@ -22,11 +22,6 @@ class ActionFadeBy : ActionInterval
         return new ActionFadeBy(-delta, duration);
     }
 
-    public override void start()
-    {
-        base.start();
-    }
-
     public override void stepInterval(float dt)
     {
         float d = dt / duration;

src/ActionsInterval/ActionFadeIn.cs

@@ -0,0 +1,22 @@
+using System;
+using System.Collections.Generic;
+using UnityEngine;
+
+class ActionFadeIn : ActionFadeTo
+{
+
+    public ActionFadeIn(float tgtDuration)
+        : base(1, tgtDuration)
+    {
+    }
+
+    public override Action clone()
+    {
+        return new ActionFadeIn(duration);
+    }
+
+    public override Action reverse()
+    {
+        return new ActionFadeIn(duration);
+    }
+}

src/ActionsInterval/ActionFadeOut.cs

@@ -0,0 +1,22 @@
+using System;
+using System.Collections.Generic;
+using UnityEngine;
+
+class ActionFadeOut : ActionFadeTo
+{
+
+    public ActionFadeOut(float tgtDuration)
+        : base(0, tgtDuration)
+    {
+    }
+
+    public override Action clone()
+    {
+        return new ActionFadeOut(duration);
+    }
+
+    public override Action reverse()
+    {
+        return new ActionFadeOut(duration);
+    }
+}

src/ActionsInterval/ActionFadeTo.cs

@@ -0,0 +1,34 @@
+using System;
+using System.Collections.Generic;
+using UnityEngine;
+
+class ActionFadeTo : ActionInterval
+{
+    public float value;
+    public float delta;
+
+    public ActionFadeTo(float tgtValue, float tgtDuration)
+        : base(tgtDuration)
+    {
+        value = tgtValue;
+    }
+
+    public override Action clone()
+    {
+        return new ActionFadeTo(value, duration);
+    }
+
+    public override void start()
+    {
+        base.start();
+        delta = value - target.gameObject.renderer.material.color.a;
+    }
+
+    public override void stepInterval(float dt)
+    {
+        float d = dt / duration;
+        Color tgtColor = target.gameObject.renderer.material.color;
+        tgtColor[3] += delta * d;
+        target.gameObject.renderer.material.color = tgtColor;
+    }
+}

src/Examples/SampleActions.cs

@@ -7,16 +7,15 @@ public class SampleActions : MonoBehaviour
     {
         Action seq = new ActionRepeat (new ActionSequence(new Action[] 
         {
+            new ActionFadeIn(2),
             new ActionParallel(new Action[] {
                 new ActionMoveBy(new Vector3(10, 0, 0), 1),
                 new ActionMoveBy(new Vector3(0, 10, 0), 1),
                 new ActionRotateBy(new Vector3(90, 0, 0), 1),
-                new ActionTintBy(new Vector4(-50, 50, -150, 0), 1)
+                new ActionTintBy(new Vector4(-50, 50, -150), 1)
             }),
             new ActionScaleBy(new Vector3(2, 2, 1), 1),
             new ActionScaleBy(new Vector3(0.5F, 0.5F, 2), 1),
-            new ActionFadeBy(-1F, 2),
-            new ActionFadeBy(1F, 2),
             new ActionDelay(1),
             new ActionRepeat(new ActionSequence(new Action[] {
                 new ActionHide(),
@@ -30,7 +29,8 @@ public class SampleActions : MonoBehaviour
             new ActionMoveTo(new Vector3(0, 0, 10), 1),
             new ActionScaleTo(new Vector3(2, 2, 2), 1),
             new ActionRotateTo(new Vector3(0, 0, 0), 1),
-            new ActionTintTo(new Vector4(67, 105, 181, 255),3)
+            new ActionFadeOut(2),
+            new ActionSetTint(new Vector4(67, 105, 181))
         }), 5);
         gameObject.SendMessage("AttachAction", seq);
     }