How can I optimize shader performance for AR passthrough on mobile devices?

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This question explores Virtual & Augmented Reality and addresses practical considerations related to: How can I optimize shader performance for AR passthrough on mobile devices?

Q&A Network · Accepted Answer

Optimizing shader performance for AR passthrough on mobile devices involves minimizing computational overhead while maintaining visual fidelity. Focus on reducing the complexity of shader operations and leveraging mobile-specific optimizations such as efficient texture sampling and minimal branching.

// Example: Optimize a simple passthrough shader
    Shader "Custom/ARPassthrough" {
      SubShader {
        Tags { "RenderType"="Opaque" }
        Pass {
          CGPROGRAM
          #pragma vertex vert
          #pragma fragment frag
          #include "UnityCG.cginc"

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

struct v2f {
            float2 uv : TEXCOORD0;
            float4 vertex : SV_POSITION;
          };

sampler2D _MainTex;
          float4 _MainTex_ST;

v2f vert (appdata_t v) {
            v2f o;
            o.vertex = UnityObjectToClipPos(v.vertex);
            o.uv = TRANSFORM_TEX(v.uv, _MainTex);
            return o;
          }

half4 frag (v2f i) : SV_Target {
            return tex2D(_MainTex, i.uv);
          }
          ENDCG
        }
      }
    }

ADDITIONAL COMMENT:
- Use half precision where possible to reduce computational load.
- Minimize texture lookups and avoid unnecessary calculations within the fragment shader.
- Profile shader performance using tools like Unity's Frame Debugger or Unreal's Shader Complexity view.
- Consider using shader variants to handle different device capabilities efficiently.
- Ensure that shader code is compatible with the target mobile GPU architecture for optimal performance.

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How can I optimize shader performance for AR passthrough on mobile devices? Pending Review

Asked on Mar 20, 2026

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