Unlit vs lit shaders in Unity - Interactive Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to declare an unlit shader in Unity.

Unity

Shader "Custom/UnlitShader" {
  SubShader {
    Pass {
      CGPROGRAM
      #pragma vertex vert
      #pragma fragment [1]
      ENDCG
    }
  }
}

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Alight

Bvert

Csurf

Dfrag

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'vert' instead of 'frag' for the fragment shader.

Confusing surface shaders with unlit shaders.

The fragment shader function is declared with #pragma fragment frag to handle pixel colors in an unlit shader.

2fill in blank

medium

Complete the code to add lighting support in a lit shader.

Unity

Shader "Custom/LitShader" {
  SubShader {
    Tags { "RenderType" = "Opaque" }
    CGPROGRAM
    #pragma surface [1] Standard
    ENDCG
  }
}

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Afrag

Bvert

Csurf

Dlight

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'frag' or 'vert' instead of 'surf' for surface shaders.

Omitting the lighting model like 'Standard'.

Surface shaders use #pragma surface surf Standard to enable lighting and standard shading models.

3fill in blank

hard

Fix the error in the unlit shader code by completing the missing pragma directive.

Unity

Shader "Custom/ErrorUnlit" {
  SubShader {
    Pass {
      CGPROGRAM
      #pragma vertex vert
      #pragma [1] frag
      ENDCG
    }
  }
}

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Afragment

Bsurface

Cfrag

Dvertex

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'frag' alone instead of 'fragment'.

Using 'surface' which is for surface shaders.

The correct pragma directive for the fragment shader is #pragma fragment frag. Using 'fragment' specifies the fragment shader function.

4fill in blank

hard

Fill both blanks to complete the surface shader function signature and return type.

Unity

struct Input {
  float2 uv_MainTex;
};

[1] surf (Input IN, inout SurfaceOutputStandard [2]) {
  [2].Albedo = float3(1, 0, 0);
}

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Avoid

Bo

CSurfaceOutputStandard

DIN

Attempts:

3 left

💡 Hint

Common Mistakes

Returning a struct instead of void.

Using incorrect parameter names.

The surface shader function returns void and uses an inout parameter named o to modify the surface output.

5fill in blank

hard

Fill all three blanks to complete the unlit shader fragment function that outputs a fixed color.

Unity

fixed4 [1] (v2f i) : SV_Target {
  return [2];
}

struct v2f {
  float4 pos : SV_POSITION;
};

fixed4 fixedColor = fixed4([3], 1.0);

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Afrag

Bfloat4(0.0, 1.0, 0.0, 1.0)

C0.0, 1.0, 0.0

Dvert

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'vert' as the fragment function name.

Returning a float4 literal without fixed4 type.

Incorrect RGB values format.

The fragment function is named 'frag', returns a fixed4 color, and the fixedColor uses RGB values '0.0, 1.0, 0.0' for green.