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Making unity player / scene background transparent

Discussion in 'Windows' started by DanglingNeuron, Jun 17, 2015.

  1. DanglingNeuron

    DanglingNeuron

    Joined:
    Dec 4, 2012
    Posts:
    37
    Is there any way to make the unity scene background transparent?

    e.g.

    Lets say I only have a cube in the center of my scene. I only want unity to display that and the rest of the player surface be transparent. So in my exported visual studio project, I can render whatever I need natively e.g. a background with text/image. I want to augment unity graphics cube on top of native stuff (background) I do in visual studio.

    I know it may sound crazy :) but I have some good use for it.
     
    DanglingNeuron, Jun 17, 2015
    #1

  2. Tautvydas-Zilys

    Tautvydas-Zilys

    Unity Technologies

    Joined:
    Jul 25, 2013
    Posts:
    10,507
    Are you targeting Windows Store?

    There's a couple of ways to achieve it, the easiest being render your stuff to a texture and use a custom shader that draws your texture instead of the skybox. You could use this one:

    Code (csharp):
    1.  
    2. // Skybox shader that just draws flat texture in the background
    3. Shader "Skybox/Background Texture"
    4. {
    5.    Properties
    6.    {
    7.      _MainTex ("Texture", 2D) = "white" {}
    8.    }
    9.    SubShader
    10.    {
    11.      Tags { "Queue"="Background" "RenderType"="Background" "PreviewType"="Skybox" }
    12.      Cull Off ZWrite Off
    13.  
    14.      Pass
    15.      {
    16.        CGPROGRAM
    17.        #pragma vertex vert
    18.        #pragma fragment frag
    19.        #include "UnityCG.cginc"
    20.  
    21.        void vert (float4 pos : POSITION, out float4 ouv : TEXCOORD0, out float4 opos : SV_POSITION)
    22.        {        
    23.          opos = mul(UNITY_MATRIX_MVP, pos);
    24.          ouv = ComputeScreenPos(opos);
    25.        }
    26.  
    27.        sampler2D _MainTex;
    28.      
    29.        fixed4 frag (float4 uv : TEXCOORD0) : SV_Target
    30.        {
    31.          fixed4 col = tex2Dproj(_MainTex, uv);
    32.          return col;
    33.        }
    34.        ENDCG
    35.      }
    36.    }
    37. }
    38.  
     
    Tautvydas-Zilys, Jun 17, 2015
    #2
    MRCalderon3D likes this.

  3. micla

    micla

    Joined:
    Aug 25, 2015
    Posts:
    1
    great! Unfortunately I'm a novice and am stuck getting this properly wired up. Does anyone have a sample solution they're willing to share?
     
    micla, Aug 25, 2015
    #3

  4. cchacon

    cchacon

    Joined:
    Sep 20, 2015
    Posts:
    18
    hi guys did you get more details on how to do this?
     
    cchacon, Feb 9, 2016
    #4

  5. MRCalderon3D

    MRCalderon3D

    Joined:
    Jan 22, 2013
    Posts:
    7
    Tautvydas Zilys I tried it but can't make it works :( any advise or sample?
     
    MRCalderon3D, Mar 2, 2016
    #5

  6. Tautvydas-Zilys

    Tautvydas-Zilys

    Unity Technologies

    Joined:
    Jul 25, 2013
    Posts:
    10,507
    What exactly did you do and what didn't work?
     
    Tautvydas-Zilys, Mar 2, 2016
    #6