Use red circle for calibration

Assets/RedMaterial.mat

@@ -0,0 +1,81 @@
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Assets/RedMaterial.mat.meta

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Assets/Scenes/Calibration.unity

@@ -159,7 +159,7 @@ Camera:
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@@ -349,7 +349,7 @@ MeshRenderer:
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@@ -388,7 +388,7 @@ Transform:
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