Object is only visible to the left eye

user_7847355 0
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I have a Unity project using MRTK.

After I changed the MRTK/Standard shader with the following shader, it only renders the object to the left eye.

How can I render the object to both eyes?

Shader "HoloUS/BrightnessContrast"
{
    Properties
    {
        _MainTex("Texture", 2D) = "white" {}
        _Width("Width", Float) = 1
        _Center("Center", Float) = 0.5
    }
    
    SubShader
    {
        Tags { "RenderType" = "Opaque" }
        LOD 100

        Pass
        {
            CGPROGRAM
            
            #pragma vertex vert
            #pragma fragment frag
            
            #include "UnityCG.cginc"

            struct VInp
            {
                float4 vertex : POSITION;
                float2 uv : TEXCOORD0;
            };

            struct VOut
            {
                float2 uv : TEXCOORD0;
                float4 vertex : SV_POSITION;
            };

            sampler2D _MainTex;
            float4 _MainTex_ST;
            float _Center;
            float _Width;

            VOut vert(VInp inp)
            {
                VOut o;
                o.vertex = UnityObjectToClipPos(inp.vertex);
                o.uv = TRANSFORM_TEX(inp.uv, _MainTex);
                return o;
            }

            fixed4 frag(VOut inp) : SV_Target
            {
                float min = _Center - _Width / 2;
                return tex2D(_MainTex, inp.uv) * _Width + min;
            }
            
            ENDCG
        }
    }
}
mrtk hololens unity3d augmented-reality shader
2 Answers

For shaders with Hololens and MRTK2, there is an upgrade path perhaps that needs to be clicked through: https://docs.microsoft.com/en-us/windows/mixed-reality/mrtk-unity/mrtk2/features/rendering/mrtk-standard-shader?q=shader&view=mrtkunity-2022-05

Also, Unity defines following on stereo rendering for HoloLens for shader script requirements: https://docs.unity3d.com/Manual/SinglePassStereoRenderingHoloLens.html

From version of Unity, could not tell the specific version and MRTK version using in sample above. If have further details, perhaps can assist further too with community.

user_60045700

If you are using single pass vr, there are few changes in shader declaration, in order to recognise stereo texture input in single pass.

//add this in struct appdata
UNITY_VERTEX_INPUT_INSTANCE_ID

//add this in struct v2f
UNITY_VERTEX_OUTPUT_STEREO

//replace sampler2D
UNITY_DECLARE_SCREENSPACE_TEXTURE(_MainTex);

//add these inside v2f vert()
UNITY_SETUP_INSTANCE_ID(v);
UNITY_INITIALIZE_OUTPUT(v2f, o);
UNITY_INITIALIZE_VERTEX_OUTPUT_STEREO(o);

Additional link: Single Pass Instanced rendering

user_128794250
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