GBufferFilm about pbrt-v4 HOT 3 CLOSED

Sorry for the lack of documentation.. Just do:

Film "gbuffer" "string filename" "foo.exr" "integer xresolution" 1234 # etc...

You'll get a "deep" EXR file, where all of that additional stuff is in additional image channels.

from pbrt-v4.

Thanks for your quick response.

It seems the Albedo channel in EXR file seems strange.
It should not be affected by the number of pixel samples. (I expected the original Kd reflectance)

"""
Integrator "path"
"integer maxdepth" [ 3 ]
Sampler "halton"
"integer pixelsamples" [ 2 ]
PixelFilter "box"
"float xradius" [ 0.5 ]
"float yradius" [ 0.5 ]

Film "gbuffer"
"string filename" [ "cornell-box.exr" ]
"integer yresolution" [ 512 ]
"integer xresolution" [ 512 ]

Camera "perspective"
"float fov" [ 45 ]

WorldBegin
AttributeBegin
AreaLightSource "diffuse"
"rgb L" [ 10 10 10 ]
NamedMaterial "Light"
Shape "trianglemesh"
"point2 uv" [ 0 0 1 0 1 1 0 1
]
"normal N" [ -8.74228e-8 -1 1.86006e-7 -8.74228e-8 -1 1.86006e-7 -8.74228e-8
-1 1.86006e-7 -8.74228e-8 -1 1.86006e-7 ]
"point3 P" [ -0.24 1.98 -0.22 0.23 1.98 -0.22 0.23 1.98 0.16 -0.24 1.98 0.16 ]
"integer indices" [ 0 1 2 0 2 3 ]
AttributeEnd
MakeNamedMaterial "LeftWall"
"string type" [ "diffuse" ]
"rgb reflectance" [ 1 0 0 ]
MakeNamedMaterial "RightWall"
"string type" [ "diffuse" ]
"rgb reflectance" [ 0 1 0 ]
MakeNamedMaterial "Floor"
"string type" [ "diffuse" ]
"rgb reflectance" [ 1 1 1 ]
MakeNamedMaterial "Ceiling"
"string type" [ "diffuse" ]
"rgb reflectance" [ 1 1 1 ]
MakeNamedMaterial "BackWall"
"string type" [ "diffuse" ]
"rgb reflectance" [ 1 1 1 ]
MakeNamedMaterial "ShortBox"
"string type" [ "diffuse" ]
"rgb reflectance" [ 1 1 1 ]
MakeNamedMaterial "TallBox"
"string type" [ "diffuse" ]
"rgb reflectance" [ 1 1 1 ]
MakeNamedMaterial "Light"
"string type" [ "diffuse" ]
"rgb reflectance" [ 0 0 0 ]
NamedMaterial "Floor"
Shape "trianglemesh"
"point2 uv" [ 0 0 1 0 1 1 0 1
]
"normal N" [ 4.37114e-8 1 1.91069e-15 4.37114e-8 1 1.91069e-15 4.37114e-8 1 1.91069e-15
4.37114e-8 1 1.91069e-15 ]
"point3 P" [ -1 1.74846e-7 -1 -1 1.74846e-7 1 1 -1.74846e-7 1 1 -1.74846e-7 -1 ]
"integer indices" [ 0 1 2 0 2 3 ]
NamedMaterial "Ceiling"
Shape "trianglemesh"
"point2 uv" [ 0 0 1 0 1 1 0 1
]
"normal N" [ -8.74228e-8 -1 -4.37114e-8 -8.74228e-8 -1 -4.37114e-8 -8.74228e-8
-1 -4.37114e-8 -8.74228e-8 -1 -4.37114e-8 ]
"point3 P" [ 1 2 1 -1 2 1 -1 2 -1 1 2 -1 ]
"integer indices" [ 0 1 2 0 2 3 ]
NamedMaterial "BackWall"
Shape "trianglemesh"
"point2 uv" [ 0 0 1 0 1 1 0 1
]
"normal N" [ 8.74228e-8 -4.37114e-8 -1 8.74228e-8 -4.37114e-8 -1 8.74228e-8 -4.37114e-8
-1 8.74228e-8 -4.37114e-8 -1 ]
"point3 P" [ -1 0 -1 -1 2 -1 1 2 -1 1 0 -1 ]
"integer indices" [ 0 1 2 0 2 3 ]
NamedMaterial "RightWall"
Shape "trianglemesh"
"point2 uv" [ 0 0 1 0 1 1 0 1
]
"normal N" [ 1 -4.37114e-8 1.31134e-7 1 -4.37114e-8 1.31134e-7 1 -4.37114e-8
1.31134e-7 1 -4.37114e-8 1.31134e-7 ]
"point3 P" [ 1 0 -1 1 2 -1 1 2 1 1 0 1 ]
"integer indices" [ 0 1 2 0 2 3 ]
NamedMaterial "LeftWall"
Shape "trianglemesh"
"point2 uv" [ 0 0 1 0 1 1 0 1
]
"normal N" [ -1 -4.37114e-8 -4.37114e-8 -1 -4.37114e-8 -4.37114e-8 -1 -4.37114e-8
-4.37114e-8 -1 -4.37114e-8 -4.37114e-8 ]
"point3 P" [ -1 0 1 -1 2 1 -1 2 -1 -1 0 -1 ]
"integer indices" [ 0 1 2 0 2 3 ]
"""

from pbrt-v4.

Ah, the joys of spectral rendering. It is expected that there will be some noise at low sampling rates here since at each pixel sample, pbrt picks 4 random wavelengths and does all of its computations at those wavelengths. Then, when the image is output, the RGB spectral matching functions are used to compute back to RGB. So, there's some inherent Monte Carlo noise in that round-trip from the original RGB colors. This is moderately annoying, but I think worth it for the advantages of doing the spectral stuff properly.

from pbrt-v4.