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\[
C_{pri} = m_e + m_a * s_a + \sum_{i = 0}^{\#lights} a * SpotlightLut[d_0] * f_i * o * (m^{(a)} * l_i^{(a)} + m^{(d)} * l_i^{(d)} * (L_i \cdot N))
\]

\[
C_{sec} = \sum_{i = 0}^{\#lights} a * SpotlightLut[d_0] * f_i * o * (m^{(s)}LutD_0[d_1]*G_i^{(0)} + ReflectionLutsRGB[d_2]*LutD_1[d_3]*G_i^{(1)})*l_i^{(s)}
\]

\[
C_{alpha} = FresnelLut[d_4]
\]
Outputs:

* $C_{pri}$ - GPU primary color
* $C_{sec}$ - GPU secondary color 
* $C_{alpha}$ - Primary and/or secondary alpha, target is selectable (fresnel alpha pri / sec)

Inputs, per-fragment:

* $N$ - Interpolated normal
* $V$ - View direction vector (fragment <-> camera)
* $T$ - Tangent direction vector
* $a$ - Distance attenuation factor. I am not sure how that one works. It maybe goes through a LUT also.

Inputs, per-pass:

* $d_{0...4}$ - Selectable LUT inputs - one of the following: $N \cdot H$, $V \cdot H_i$, $N \cdot V$, $L_i \cdot N$, $-L_i \cdot P$, $\cos \phi_i$.
* $s^{(a)}$ - Scene ambient color
* $o$ - Shadow attenuation from the shadow map (if there is one)

Inputs, per-material:

* $m^{(e)}$ - Material emission color
* $m^{(a)}$ - Material ambient color
* $m^{(d)}$ - Material diffuse color
* $m^{(s)}$ - Material specular color

Inputs, Per-Light:

* $P_i$ - Spotlight direction
* $L_i$ - Light direction vector (fragment <-> light)
* $H_i$ - Half-vector between $L$ and $V$
* $\phi_i$ - Angle between the projection of $H_i$ into the tangent plane and $T$
* $f_i$ - 0 if $N \cdot L < 0$ and negative lighting = false, otherwise 1
* $l_i^{(a)}$ - Light ambient color
* $l_i^{(d)}$ - Light diffuse color
* $l_i^{(s)}$ - Light specular color
* $G_i^{(0)}, G_i^{(1)}$ - Cook-Torrance geometric factor, or 1 when disabled

Sun, 22 Jul 2018 16:38 GMT