johnhaddon
commented
3 months ago To me it looks like there are a few different things going on here :
- The EXR file out of Blender has non-standard channel names, with lowercase
.r,.getc where there should be uppercase.R,.Betc. - The EXR file out of Blender has everything nested inside a
ViewLayerlayer for some reason. This isn't technically wrong, but it is unusual in my experience. This also means there is no standardRGBA"beauty" layer. - The Cryptomatte node has a bug when there is no RGBA layer in the input.
If you copy-paste the script below into Gaffer, you should see that things can be made to work if those problems are corrected.
```
import Gaffer
import GafferImage
import GafferScene
import IECore
import imath
Gaffer.Metadata.registerValue( parent, "serialiser:milestoneVersion", 1, persistent=False )
Gaffer.Metadata.registerValue( parent, "serialiser:majorVersion", 4, persistent=False )
Gaffer.Metadata.registerValue( parent, "serialiser:minorVersion", 3, persistent=False )
Gaffer.Metadata.registerValue( parent, "serialiser:patchVersion", 0, persistent=False )
__children = {}
__children["with_z_b41_0001"] = GafferImage.ImageReader( "with_z_b41_0001" )
parent.addChild( __children["with_z_b41_0001"] )
__children["with_z_b41_0001"].addChild( Gaffer.V2fPlug( "__uiPosition", defaultValue = imath.V2f( 0, 0 ), flags = Gaffer.Plug.Flags.Default | Gaffer.Plug.Flags.Dynamic, ) )
__children["Cryptomatte"] = GafferScene.Cryptomatte( "Cryptomatte" )
parent.addChild( __children["Cryptomatte"] )
__children["Cryptomatte"].addChild( Gaffer.V2fPlug( "__uiPosition", defaultValue = imath.V2f( 0, 0 ), flags = Gaffer.Plug.Flags.Default | Gaffer.Plug.Flags.Dynamic, ) )
__children["Shuffle"] = GafferImage.Shuffle( "Shuffle" )
parent.addChild( __children["Shuffle"] )
__children["Shuffle"]["shuffles"].addChild( Gaffer.ShufflePlug( "shuffle0", flags = Gaffer.Plug.Flags.Default | Gaffer.Plug.Flags.Dynamic, ) )
__children["Shuffle"].addChild( Gaffer.V2fPlug( "__uiPosition", defaultValue = imath.V2f( 0, 0 ), flags = Gaffer.Plug.Flags.Default | Gaffer.Plug.Flags.Dynamic, ) )
__children["Expression"] = Gaffer.Expression( "Expression" )
parent.addChild( __children["Expression"] )
__children["Expression"]["__out"].addChild( Gaffer.StringPlug( "p0", direction = Gaffer.Plug.Direction.Out, defaultValue = '', flags = Gaffer.Plug.Flags.Default | Gaffer.Plug.Flags.Dynamic, substitutions = IECore.StringAlgo.Substitutions.NoSubstitutions ) )
__children["Expression"].addChild( Gaffer.V2fPlug( "__uiPosition", defaultValue = imath.V2f( 0, 0 ), flags = Gaffer.Plug.Flags.Default | Gaffer.Plug.Flags.Dynamic, ) )
__children["Constant"] = GafferImage.Constant( "Constant" )
parent.addChild( __children["Constant"] )
__children["Constant"].addChild( Gaffer.V2fPlug( "__uiPosition", defaultValue = imath.V2f( 0, 0 ), flags = Gaffer.Plug.Flags.Default | Gaffer.Plug.Flags.Dynamic, ) )
__children["CopyChannels"] = GafferImage.CopyChannels( "CopyChannels" )
parent.addChild( __children["CopyChannels"] )
__children["CopyChannels"]["in"].addChild( GafferImage.ImagePlug( "in2", flags = Gaffer.Plug.Flags.Default | Gaffer.Plug.Flags.Dynamic, ) )
__children["CopyChannels"].addChild( Gaffer.V2fPlug( "__uiPosition", defaultValue = imath.V2f( 0, 0 ), flags = Gaffer.Plug.Flags.Default | Gaffer.Plug.Flags.Dynamic, ) )
__children["with_z_b41_0001"]["fileName"].setValue( '/home/john/Downloads/cryptomatte/with_z_b41_0001.exr' )
__children["with_z_b41_0001"]["__uiPosition"].setValue( imath.V2f( 18.1511688, 33.2099152 ) )
Gaffer.Metadata.registerValue( __children["Cryptomatte"], 'annotation:user:text', 'With all those fixes applied, the Cryptomatte node can recognise the input and generate a matte appropriately.' )
Gaffer.Metadata.registerValue( __children["Cryptomatte"], 'annotation:user:color', imath.Color3f( 0.150000006, 0.25999999, 0.25999999 ) )
__children["Cryptomatte"]["in"].setInput( __children["CopyChannels"]["out"] )
__children["Cryptomatte"]["layer"].setValue( 'ViewLayer.CryptoObject' )
__children["Cryptomatte"]["matteNames"].setValue( IECore.StringVectorData( [ '/Cube', '' ] ) )
__children["Cryptomatte"]["__uiPosition"].setValue( imath.V2f( 21.1511688, 2.11772776 ) )
Gaffer.Metadata.registerValue( __children["Shuffle"], 'annotation:user:text', 'The EXR from Blender is malformed, with channels using lower-case names `r`, `g`, `b` etc instead of the expected upper-case names `R`, `G`, `B`. The Shuffle node fixes that.' )
Gaffer.Metadata.registerValue( __children["Shuffle"], 'annotation:user:color', imath.Color3f( 0.150000006, 0.25999999, 0.25999999 ) )
__children["Shuffle"]["in"].setInput( __children["with_z_b41_0001"]["out"] )
__children["Shuffle"]["shuffles"]["shuffle0"]["source"].setValue( '*.[rgba]' )
__children["Shuffle"]["shuffles"]["shuffle0"]["deleteSource"].setValue( True )
Gaffer.Metadata.registerValue( __children["Shuffle"]["shuffles"]["shuffle0"]["source"], 'channelPlugValueWidget:isCustom', True )
__children["Shuffle"]["shuffles"]["shuffle0"]["destination"].setInput( __children["Expression"]["__out"]["p0"] )
Gaffer.Metadata.registerValue( __children["Shuffle"]["shuffles"]["shuffle0"]["destination"], 'channelPlugValueWidget:isCustom', True )
__children["Shuffle"]["__uiPosition"].setValue( imath.V2f( 18.1511688, 25.0458527 ) )
__children["Expression"]["__uiPosition"].setValue( imath.V2f( 7.6503315, 25.0460129 ) )
__children["Constant"]["__uiPosition"].setValue( imath.V2f( 36.8500023, 18.4458523 ) )
Gaffer.Metadata.registerValue( __children["CopyChannels"], 'annotation:user:text', 'The Cryptomatte node seems to have a bug triggered by not having RGBA channels in the input. Copy in some channels to keep it happy.' )
Gaffer.Metadata.registerValue( __children["CopyChannels"], 'annotation:user:color', imath.Color3f( 0.150000006, 0.25999999, 0.25999999 ) )
__children["CopyChannels"]["in"][0].setInput( __children["Shuffle"]["out"] )
__children["CopyChannels"]["in"][1].setInput( __children["Constant"]["out"] )
__children["CopyChannels"]["channels"].setValue( '*' )
__children["CopyChannels"]["__uiPosition"].setValue( imath.V2f( 21.1511688, 10.2817898 ) )
__children["Expression"]["__engine"].setValue( 'python' )
__children["Expression"]["__expression"].setValue( 'source = context.get( "source", "" )\ndest = source.replace( ".r", ".R" )\ndest = dest.replace( ".g", ".G" )\ndest = dest.replace( ".b", ".B" )\ndest = dest.replace( ".a", ".A" )\n\nparent["__out"]["p0"] = dest' )
del __children
```
I think it's probably worth us tweaking the ImageReader so that it can conform the non-standard lowercase channels automatically - we already have loads of heuristics for dealing with dodgy EXRs from other sources. And we should fix the Cryptomatte problem too. But ideally you'd be able to get the output from Blender formatted in a more standard way as well...
aditiapratama
Version: Gaffer 1.4.X.X-(linux, windows) Third-party tools: None Third-party modules: None
Description
I have EXR with cryptomatte generated from blender 3.6 LTS and also 4.1.1. Whenever I load it and put cryptomatte node, the
Viewerwill stay black. However I have another EXR with crypto from blender 2.93 LTS, it will load just fine.I attached both exr and blend files.
Steps to reproduce
Debug log
Click to Expand
``` ```