Fade between textures in the same script?

Question

Another issue I can't seem to wrap my head around... Similar to the one I had earlier.

Issue: I want to crossfade from one DrawTexture to another.

My system: My system works with an XML parser. Basically, all the GUI items are in the same script.

For instance, my DrawTexture is being drawn in the GUI, like so:

GUI.DrawTexture (Rect (0, 0, 1280, 1024), textureBackground, ScaleMode.StretchToFill);

but changed by this command when the XML parser detects the tag :

textureBackground =  Resources.Load("Backgrounds/" + input.change,Texture2D);

the "input.change" is the name of the texture (which I state in the XML file like so: example01.

So what I'd like to do is sort of crossfade into the next texture as soon as I give that command.

My idea was, in layman's terms, to first make a second DrawTexture, which assumes the new texture when the command is given. Then I'd fade the alpha up to completely opaque (in say 2 seconds time), set the first DrawTexture to match the second DrawTexture, and then reset the second one's alpha back to 0, so the background image is now set. And of course repeat the process when the texture changes again.

I realize this is probably very amateuristic, but looking around UnityAnswers, I can't seem to find another way of doing it. All other Answers I find mostly use external script, and I can't, as I need the depth to stay the same (it is a background after all, there are many more GUI elements being drawn on top of it). Nor can I seem to get it working.

Please help me out, I've tried to do it myself but I'm just too much of a beginner/bad scripter to grasp this. Getting to the end of my project time, as well...

-Veliremus

Answer 1

Best Answer

Answer by Molix · May 19, 2010 at 01:39 PM

During the crossfade period you'll actually be drawing two textures, so just give yourself another reference and set a timer, e.g.:

var textureBackground : Texture2D; var previousBackground : Texture2D; public var crossfadeDuration : float = 2.0; var crossfadeEnd : float;

function OnGUI()
{
  var oldColor : Color = GUI.color;
  var alpha : float = 1;

  if( crossfadeEnd > Time.time )
  {
    alpha = 1.0 - (( crossfadeEnd - Time.time ) / crossfadeDuration);
    if( previousBackground != null )
    {
      GUI.color = Color( 1, 1, 1, 1 - alpha );
      GUI.DrawTexture (Rect (0, 0, 1280, 1024), previousBackground, ScaleMode.StretchToFill);
    }
  }

  GUI.color = Color( 1, 1, 1, alpha );
  GUI.DrawTexture (Rect (0, 0, 1280, 1024), textureBackground, ScaleMode.StretchToFill);

  GUI.color = oldColor;
  // other controls that are in front of backgrounds
}

function NewBackground()
{
  // do your loading, etc, and start the timer, e.g.
  previousBackground = textureBackground;
  textureBackground =  Resources.Load("Backgrounds/" + input.change,Texture2D);
  crossfadeEnd = Time.time + crossfadeDuration;
}

(note: this is off-the-cuff, and I don't usually use JS, but it should get you in the right direction).

3 Show 3 · Share

Story Specialist · May 19, 2010 at 03:57 PM 0

Share

Dude, you are a lifesaver! Had to correct a spelling error, as you used both crossfadeEnd and crossFadeEnd (capital letter on Fade), but that was easily discovered in the debug :). Thank you so much, it works like a charm. =D

Molix · May 19, 2010 at 04:26 PM 0

Share

You're welcome; I'm glad it works! (I fixed the crossfadeEnd spelling now in case others find it useful).

Donilias · Jan 26, 2012 at 04:24 PM 0

Share

Sorry i'm to late, But i want the same one. But this isn't work. First i got an error. The error was input, so i changed input into Input. So then i run the game, but nothing happends. Someone can tell me what to do?

Answer 2

Answer by Juan 1 · May 06, 2011 at 05:51 AM

Is there a way to do this using a 3D plane with a texture instead of GUI elements?

0 · Share

Answer 3

Answer by ellens · Sep 06, 2012 at 08:21 AM

You can do this easily with a custom shader and a simple script: http://www.sundh.com/blog/2012/09/real-time-blend-2-textures-in-unity/

0 · Share

Fade between textures in the same script?

3 Replies

Your answer

Welcome to Unity Answers

Follow this Question

Related Questions