koobas.hobune.stream
how to fade in/out a scene?
how do i fade in a scene from a black screen to a skybox? later i want to crossfade the first skybox to a second skybox. finally i want to fadeout the second skybox to a white screen. how do i do that? thanks, flexrails
In case anyone wants to achieve this using the new Unity GUI check out the link below
You'd do the fading to white/black placing a single-colored texture across your screen, and changing the alpha value of it over time so that it fades in, or fades out.
There are a number of different ways of placing this texture on-screen, you could:
- Use the older method of GUITexture GameObjects from the menu (GameObject -> Create Other -> GUI Texture)
- Place a plane in front of your camera, or render one using a 2nd camera in your scene
- Use the newer GUI scripting system to draw the texture
The code you'd use for the 3rd option above might look something like this. You'd start the alphaFadeValue at 1, and the "/ 5" is so the fade lasts 5 seconds.
alphaFadeValue -= Mathf.Clamp01(Time.deltaTime / 5);
GUI.color = new Color(0, 0, 0, alphaFadeValue); GUI.DrawTexture( new Rect(0, 0, Screen.width, Screen.height ), blackTexture );
I keet getting the error $$anonymous$$ identifier 'alphaFadeValue'/ 'black texture'
Pangaea, you cannot copy this verbatim. You need to define instance variables in your classes for these values. For instance, you would instantiate alphaFadeValue as 1 and also create a Texture object in your class called blackTexture. Once you create these, it should work out for you.
To fade between two different sets of skybox textures, there's a shader on the Wiki designed to do exactly this, here:
it says that it requires $$anonymous$$imum hardware. how would i do 2 skyboxes without that $$anonymous$$imum hardware?
I think these are pretty low-spec hardware requirements. It says "GeForce 3". According to Wikipedia, the GeForce 3 series were introduced in 2001, and were superceded in 2002 by the GeForce 4 series. If you really needed to achieve this on very old hardware, you would probably need to create your own skybox system, where you draw the skybox twice, once with the first skybox texture, then again with the 2nd texture using an alpha-blended shader. You would probably want to use an additional camera in your scene dedicated to this task, so that it gets drawn behind everything else.
I've just been working on the same thing.
I've adapted the wiki shader mentioned above so that it can be used on older machines. It's very similar to the original - I just manged to get rid of one 'set texture' so it can be used on all but the oldest machines (the only Unity emulation mode that doesn't support it is 'dinosaur'). Older machines will show the first skybox only.
Shader "Custom/Skybox" {
Properties { _Tint ("Tint Color", Color) = (.5, .5, .5, .5) _FrontTex ("Front (+Z)", 2D) = "white" {} _BackTex ("Back (-Z)", 2D) = "white" {} _LeftTex ("Left (+X)", 2D) = "white" {} _RightTex ("Right (-X)", 2D) = "white" {} _UpTex ("Up (+Y)", 2D) = "white" {} _DownTex ("Down (-Y)", 2D) = "white" {} _FrontTex2("2 Front (+Z)", 2D) = "white" {} _BackTex2("2 Back (-Z)", 2D) = "white" {} _LeftTex2("2 Left (+X)", 2D) = "white" {} _RightTex2("2 Right (-X)", 2D) = "white" {} _UpTex2("2 Up (+Y)", 2D) = "white" {} _DownTex2("2 Down (-Y)", 2D) = "white" {} _Color ("Fade (use alpha)", Color) = (1,1,1,1) }
SubShader { Tags { "Queue" = "Background" } Cull Off ZWrite On ZTest Always Fog { Mode Off } Lighting Off
Color [_Tint] Pass { SetTexture [_FrontTex] { combine texture } SetTexture[_FrontTex2] { constantColor [_Color] combine texture lerp (constant) previous } } Pass { SetTexture [_BackTex] { combine texture } SetTexture[_BackTex2] { constantColor [_Color] combine texture lerp (constant) previous } } Pass { SetTexture [_LeftTex] { combine texture } SetTexture[_LeftTex2] { constantColor [_Color] combine texture lerp (constant) previous } } Pass { SetTexture [_RightTex] { combine texture } SetTexture[_RightTex2] { constantColor [_Color] combine texture lerp (constant) previous } } Pass { SetTexture [_UpTex] { combine texture } SetTexture[_UpTex2] { constantColor [_Color] combine texture lerp (constant) previous } } Pass { SetTexture [_DownTex] { combine texture } SetTexture[_DownTex2] { constantColor [_Color] combine texture lerp (constant) previous } } }
Fallback "RenderFX/Skybox", 1 }
To animate between one texture and the next:
private var thisMaterial : Material; private var fadeSpeed : float = 0.4;
function Start (){ thisMaterial = RenderSettings.skybox; thisMaterial.color.a = 0.0; }
function Update () { thisMaterial.color.a += (fadeSpeed * Time.deltaTime); thisMaterial.color.a = Mathf.Clamp(thisMaterial.color.a, 0.0, 1.0); }
To fade from the second skybox to the first skybox start with thisMaterial.color.a=1.0; and use -= instead of +=
To change what you are fading to and from simply change the material variables. Eg, to fade from black to the second skybox texture:
public var blackTexture : Texture2D;
function Start (){ thisMaterial = RenderSettings.skybox; thisMaterial.color.a = 0.0;
thisMaterial.SetTexture("_FrontTex", blackTexture);
thisMaterial.SetTexture("_BackTex", blackTexture);
thisMaterial.SetTexture("_LeftTex", blackTexture);
thisMaterial.SetTexture("_RightTex", blackTexture);
thisMaterial.SetTexture("_UpTex", blackTexture);
thisMaterial.SetTexture("_DownTex", blackTexture);
} function Update () { thisMaterial.color.a += (fadeSpeed * Time.deltaTime); thisMaterial.color.a = Mathf.Clamp(thisMaterial.color.a, 0.0, 1.0); }
To fade between different skyboxes set the different textures like we did above, but this time with your skybox textures, not a single black texture. For the second set of textures use
thisMaterial.SetTexture("_FrontTex2", textureVariable);
etc
how sad that none of our newer answers get the attention they deserve... :)
to crossfade between two skyboxes, you could create two skyboxes, one slightly bigger than the other so that it encompasses the other. Then you could fade the inner one's alpha to make it fade in or out.
This way works for me:
alphaFadeValue -= Mathf.Clamp01(Time.deltaTime / 5);
GUI.color = new Color(alphaFadeValue, alphaFadeValue, alphaFadeValue, alphaFadeValue);
GUI.DrawTexture( new Rect(0, 0, Screen.width, Screen.height ), blackTexture );
Thanks for the solution, Duck. Just wanted to add that $$anonymous$$athf.Clamp01 should be outside of the incrementing/decrementing or else alphaFadeValue will exceed the range of 0-1:
alphaFadeValue = $$anonymous$$athf.Clamp01(alphaFadeValue - (Time.deltaTime / fadeTime));
