Fix eye bug

[hhhhkrx]

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• Tests for the changes have been added (for bug fixes / features)
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Summary by CodeRabbit

• New Features

  • Enhanced shader flexibility for scenarios lacking tangent information.
  • Adjusted parallax mapping for improved depth perception.
  • Expanded eye color calculation for richer interaction with surface properties.

• Bug Fixes

  • Corrected height texture calculation for better visual fidelity.

[coderabbitai]

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The pull request is closed.

Walkthrough

The recent changes enhance shader flexibility and visual fidelity by introducing alternative methods for constructing the tangent-binormal matrix when tangents aren't available and refining the eye color calculation to include surface data. These adjustments improve the rendering logic, especially for scenarios lacking detailed tangent information, while also modifying the parallax mapping to alter depth perception in rendered scenes.

Changes

Files	Change Summary
packages/custom-material/src/.../EyeForwardPass.glsl, packages/custom-material/src/.../EyeFunction.glsl	Modifications to the PBRFragment and calculateEyeColor functions. Introduced a new method for tangent-binormal matrix construction and updated color calculations to include surface data. Adjusted parallax mapping logic to affect depth perception.

Sequence Diagram(s)

sequenceDiagram
    participant Shader as Shader
    participant Function as EyeFunction

    Shader->>Function: Call PBRFragment(varyings)
    Function->>Function: getTBNByDerivatives(aoUV, normal, varyings.positionWS, gl_FrontFacing)
    Function->>Function: calculateEyeColor(varyings.uv, tbn, surfaceData)
    Function->>Shader: Return color

Loading

Poem

In a world of shaders, bright and grand,
A rabbit hops with code in hand.
"With tbn and colors, oh what a sight!
Our parallax leaps to new heights!
Surface data dances, a joyful tune,
In the shader's glow, we all shall swoon!" 🐇✨

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