Combined Model with light source attenuation and atmospheric attenuation

I	=	I_amb	+	I_diff
	=	I_at k_a O_dt	+	f_att I_lt k_d (N ^. L) O_dt

where f_att = 1/d_L²	or min( 1 / (C₁ + C₂ d_L + C₃ d_L²), 1) - where d_L is distance to light L

	far from light: little change close to light: much change => accurate physically, but looks wrong

I_t^' = S_o I_t + (1 - S_o) I_dct

where I_dct is the depth cue color
- S_o = S_b + (Z_o - Z_b) (S_f - S_b) / (Z_f - Z_b)

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