54 lines
2 KiB
HLSL
54 lines
2 KiB
HLSL
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// For more information, visit -> https://github.com/ColinLeung-NiloCat/UnityURPToonLitShaderExample
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#ifndef Include_NiloOutlineUtil
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#define Include_NiloOutlineUtil
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// If your project has a faster way to get camera fov in shader, you can replace this slow function to your method.
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// For example, you write cmd.SetGlobalFloat("_CurrentCameraFOV",cameraFOV) using a new RendererFeature in C#.
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// For this tutorial shader, we will keep things simple and use this slower but convenient method to get camera fov
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float GetCameraFOV()
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{
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//https://answers.unity.com/questions/770838/how-can-i-extract-the-fov-information-from-the-pro.html
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float t = unity_CameraProjection._m11;
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float Rad2Deg = 180 / 3.1415;
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float fov = atan(1.0f / t) * 2.0 * Rad2Deg;
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return fov;
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}
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float ApplyOutlineDistanceFadeOut(float inputMulFix)
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{
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//make outline "fadeout" if character is too small in camera's view
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return saturate(inputMulFix);
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}
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float GetOutlineCameraFovAndDistanceFixMultiplier(float positionVS_Z)
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{
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float cameraMulFix;
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if(unity_OrthoParams.w == 0)
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{
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////////////////////////////////
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// Perspective camera case
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////////////////////////////////
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// keep outline similar width on screen accoss all camera distance
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cameraMulFix = abs(positionVS_Z);
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// can replace to a tonemap function if a smooth stop is needed
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cameraMulFix = ApplyOutlineDistanceFadeOut(cameraMulFix);
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// keep outline similar width on screen accoss all camera fov
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cameraMulFix *= GetCameraFOV();
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}
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else
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{
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////////////////////////////////
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// Orthographic camera case
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////////////////////////////////
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float orthoSize = abs(unity_OrthoParams.y);
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orthoSize = ApplyOutlineDistanceFadeOut(orthoSize);
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cameraMulFix = orthoSize * 50; // 50 is a magic number to match perspective camera's outline width
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}
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return cameraMulFix * 0.00005; // mul a const to make return result = default normal expand amount WS
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}
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#endif
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