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Add backface culling to the way footage geo is baked and rendered.

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Without this you can get artifacts in some situations due to the fact
that the same bake texture is mapped to both sides of a mesh face.
Another way to address this would be to map a different texture to
each side, but it's not clear how to make baking understand that.
This commit is contained in:
Nathan Vegdahl 2023-10-18 19:04:34 +02:00
parent 9e03d1b433
commit 48997d7878
1 changed files with 41 additions and 5 deletions
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46
node_groups.py
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@ -1,6 +1,12 @@
import bpy
import math
def hide_sockets(node):
for input in node.inputs:
input.hide = True
for output in node.outputs:
output.hide = True
# Ensures that the Compify Footage shader group exists.
#
# It will create it if it doesn't exist, and returns the group.
@ -348,30 +354,54 @@ def ensure_footage_group():
# Create the nodes.
mix_input = group.nodes.new(type='NodeGroupInput')
background_mask = group.nodes.new(type='ShaderNodeMixShader')
backfacing1_mask = group.nodes.new(type='ShaderNodeMixShader')
backfacing1_geo = group.nodes.new(type='ShaderNodeNewGeometry')
hide_sockets(backfacing1_geo)
backfacing1_shader = group.nodes.new(type='ShaderNodeBsdfTransparent')
camera_switch = group.nodes.new(type='ShaderNodeMixShader')
bake_switch = group.nodes.new(type='ShaderNodeMixShader')
backfacing2_mask = group.nodes.new(type='ShaderNodeMixShader')
backfacing2_geo = group.nodes.new(type='ShaderNodeNewGeometry')
hide_sockets(backfacing2_geo)
backfacing2_shader = group.nodes.new(type='ShaderNodeBsdfTransparent')
output = group.nodes.new(type='NodeGroupOutput')
# Label the nodes.
mix_input.label = "Mix Input"
background_mask.label = "Background Mask"
backfacing1_mask.label = "Backfacing Mask"
backfacing2_mask.label = "Backfacing Mask"
camera_switch.label = "Camera Switch"
bake_switch.label = "Bake Switch"
# Position the nodes.
hs = 200.0
x = 1400.0
x = 1200.0
y = 300.0
mix_input.location = (x, y)
x += hs
background_mask.location = (x, y - 100.0)
background_mask.location = (x, y - 200.0)
backfacing1_geo.location = (x, y - 450)
backfacing1_shader.location = (x, y - 550)
x += hs
camera_switch.location = (x, y - 100.0)
backfacing1_mask.location = (x, y - 450)
x += hs
camera_switch.location = (x, y - 200.0)
x += 50.0
y = 600.0
backfacing2_geo.location = (x, y)
backfacing2_shader.location = (x, y - 100)
x += hs
backfacing2_mask.location = (x, y)
x += hs
y = 300.0
bake_switch.location = (x, y)
x += hs
@ -386,9 +416,14 @@ def ensure_footage_group():
# Hook up the nodes.
group.links.new(mix_input.outputs['Footage Alpha'], background_mask.inputs['Fac'])
group.links.new(mix_input.outputs['Do Bake'], bake_switch.inputs['Fac'])
group.links.new(background_mask.outputs['Shader'], camera_switch.inputs[1])
group.links.new(backfacing1_geo.outputs['Backfacing'], backfacing1_mask.inputs['Fac'])
group.links.new(background_mask.outputs['Shader'], backfacing1_mask.inputs[1])
group.links.new(backfacing1_shader.outputs[0], backfacing1_mask.inputs[2])
group.links.new(backfacing1_mask.outputs['Shader'], camera_switch.inputs[1])
group.links.new(camera_switch.outputs['Shader'], bake_switch.inputs[1])
group.links.new(bake_switch.outputs['Shader'], output.inputs['Shader'])
group.links.new(backfacing2_geo.outputs['Backfacing'], backfacing2_mask.inputs['Fac'])
group.links.new(backfacing2_shader.outputs[0], backfacing2_mask.inputs[2])
#-------------------------------------------------
# Final hook up of all the groups of nodes above.
@ -398,7 +433,8 @@ def ensure_footage_group():
group.links.new(background_3.outputs['Shader'], background_mask.inputs[1])
group.links.new(footage_2.outputs['Shader'], background_mask.inputs[2])
group.links.new(footage_2.outputs['Shader'], camera_switch.inputs[2])
group.links.new(baking_3.outputs['Shader'], bake_switch.inputs[2])
group.links.new(baking_3.outputs['Shader'], backfacing2_mask.inputs[1])
group.links.new(backfacing2_mask.outputs['Shader'], bake_switch.inputs[2])
return group