Fast rotator limb darkening at critical speed

[AdlanSADOU]

Limb darkening on a fast rotator at critical speed produces undesired dark line near equator.

ocaVR/Assets/Shaders/LinearLD.shader

Lines 311 to 312 in dc39b0c

	float cosTheta = dot(cameraLookDirection * -1, OUT.normal);
	float4 darkening = granule * (1-(u)*(1-abs(cosTheta)));