Multiplies a normals layer by an Axis world matrix to get a simple directional light response.
Normal Light shuffles a normals layer, multiplies it by an Axis2 world_matrix through ColorMatrix, then folds the result to a single-channel light term (replicated to RGB) and clamps.
Rotate the Axis to aim the light. Useful for quick relight / contact shading from a normal AOV without a full 3D light setup.
set cut_paste_input [stack 0]
version 12.1 v5
push $cut_paste_input
Group {
name normalLight
tile_color 0x421010ff
selected true
xpos -14855
ypos 33563
addUserKnob {20 User l normalLight}
addUserKnob {41 in l "normal layer" T Shuffle18.in}
addUserKnob {41 rotate T Axis1.rotate}
addUserKnob {26 ""}
addUserKnob {26 lbl l "" +STARTLINE T "Normal Light v1.0"}
addUserKnob {22 btn l DerekVFX.ca T "nuke.tcl('start', 'https://derekvfx.ca')" +STARTLINE}
}
Axis2 {
inputs 0
rotate {0 229 0}
name Axis1
xpos 612
ypos 316
}
Input {
inputs 0
name Input
xpos 447
ypos 61
}
Shuffle {
name Shuffle18
label "\[value in]"
selected true
xpos 447
ypos 328
}
ColorMatrix {
matrix {
{{parent.Axis1.world_matrix} {parent.Axis1.world_matrix} {parent.Axis1.world_matrix}}
{{parent.Axis1.world_matrix} {parent.Axis1.world_matrix} {parent.Axis1.world_matrix}}
{{parent.Axis1.world_matrix} {parent.Axis1.world_matrix} {parent.Axis1.world_matrix}}
}
name ColorMatrix1
xpos 447
ypos 403
}
Shuffle {
green red
blue red
alpha red
name Shuffle1
label "\[value in]"
xpos 447
ypos 429
}
Clamp {
channels rgb
name Clamp1
xpos 447
ypos 479
}
Output {
name Output1
xpos 447
ypos 1055
}
end_group