Adding a stereoscopic Image within a VR Scene?

Unity Engine
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1

Hi Everyone! I am creating a virtual art gallery in Unity for the Oculus Quest headset and I am trying to figure out how to add a stereoscopic image to my scene. Like add it to a room that already has photos on the walls. meaning i want the stereoscopic image to be a part of the room, like hanging on the wall. It seems to me this should be possible. maybe a custom shader? or a script that switches shaders quickly back and forth between the two sides (left right images) of the stereoscopic image.

Any thoughts?

Mark

2

Hi,

It depends on which render pipe line you are using, and if its single pass or multi pass rendering.
Then you need a shader that support vr images, like side by side, or two textures, one for each eye for that environment.

3

Iā€™m using the URP Pipeline. with MultiPass (If I remember correctly).

The more I think about it the more it must be a custom shader.

4

There is a node in the shadergraph to get the current eyeIndex, use it to toggle between 2 textures in your material

1 Like
5

here is the stereoscopic shader i created if anyone is interested:

Shader "Custom/Stereoscopic Image" {
    Properties
    {
        [NoScaleOffset] _MainTex("Left Eye Texture", 2D) = "white" {}
    [NoScaleOffset] _MainTex2("Right Eye Texture", 2D) = "white" {}
    }
        SubShader
    {
        Pass
        {
            // indicate that our pass is the "base" pass in forward
            // rendering pipeline. It gets ambient and main directional
            // light data set up; light direction in _WorldSpaceLightPos0
            // and color in _LightColor0
            Tags {"LightMode" = "ForwardBase"}

            CGPROGRAM
            #pragma vertex vert
            #pragma fragment frag
            #include "UnityCG.cginc" // for UnityObjectToWorldNormal
            #include "UnityLightingCommon.cginc" // for _LightColor0

            struct v2f
            {
                float2 uv : TEXCOORD0;
                //float2 uv2 : TEXCOORD0;
                fixed4 diff : COLOR0; // diffuse lighting color
                float4 vertex : SV_POSITION;
                UNITY_VERTEX_OUTPUT_STEREO
            };

            v2f vert(appdata_base v)
            {
                v2f o;
                UNITY_SETUP_INSTANCE_ID(v);
                UNITY_INITIALIZE_VERTEX_OUTPUT_STEREO(o);
                o.vertex = UnityObjectToClipPos(v.vertex);
                o.uv = v.texcoord;

                // get vertex normal in world space
                half3 worldNormal = UnityObjectToWorldNormal(v.normal);
                // dot product between normal and light direction for
                // standard diffuse (Lambert) lighting
                half nl = max(0, dot(worldNormal, _WorldSpaceLightPos0.xyz));
                // factor in the light color
                o.diff = nl * _LightColor0;
                o.diff.rgb += ShadeSH9(half4(worldNormal, 1));
                return o;
            }



            sampler2D _MainTex;
            sampler2D _MainTex2;

            fixed4 frag(v2f i) : SV_Target
            {



                UNITY_SETUP_STEREO_EYE_INDEX_POST_VERTEX(i);

                    //half4 tex;
                    //half3 c;

                    if (unity_StereoEyeIndex == 0) {
                        // Left Eye
                        fixed4 col = tex2D(_MainTex, i.uv);
                        //c = DecodeHDR(tex, _TexRight_HDR);
                        col *= i.diff;
                        return col;
                    }
         else {
                        // Right Eye
                        fixed4 col = tex2D(_MainTex2, i.uv);
                        //tex = half4(1,0,0,1);
                        //c = DecodeHDR(tex, _TexRight_HDR);
                        col *= i.diff;
                        return col;
                    }



                // sample texture
                //fixed4 col = tex2D(_MainTex2, i.uv);
            // multiply by lighting

            //  col *= i.diff;
            //return col;
        }
        ENDCG
    }
    }
}
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