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 reducing computational overhead and ensuring efficient rendering. This can be achieved by simplifying shader logic, minimizing texture lookups, and leveraging mobile-specific optimizations like shader variants and LODs.

// Example: Simple passthrough shader optimization
    Shader "Custom/ARPassthroughOptimized" {
      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 {
            half4 col = tex2D(_MainTex, i.uv);
            return col;
          }
          ENDCG
        }
      }
    }

ADDITIONAL COMMENT:
- Use lower precision types like `half` instead of `float` where possible to reduce computational load.
- Minimize the number of texture lookups and avoid complex mathematical operations in the fragment shader.
- Consider using shader variants to handle different rendering paths efficiently.
- Profile shader performance using tools like Unity's Frame Debugger or RenderDoc to identify bottlenecks.
- Implement Level of Detail (LOD) techniques to reduce shader complexity based on distance from the camera.

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

Asked on May 29, 2026

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