Re: [Openexr-devel] Pixar's EXR from Renderman

[Florian Kainz]

For information about reading and writing files with an
arbitrary set of channels you you may want to read section
3 of http://www.openexr.com/ReadingAndWritingImageFiles.pdf.

For sample code, take a look at the exrmaketiled program
(included with in the OpenEXR source code).  The code in
lines 509 to 553 in file exrmaketiled/makeTiled.cpp reads an
OpenEXR file with an arbitrary number of channels into an Image
object.  Class Image is defined in exrmaketiled/Image.cpp
and exrmaketiled/Image.h.

Florian




ZiZi Zhao wrote:
> Anyone has experience in reading & writing Pixar's EXR from Renderman ?
> I would like to have some documents and sample codes about this 29
> (maybe more) channels EXR ? 
>
> One of the sample EXR images rendered has the following header info. 
>
> exrheader pixarExrSample.exr:
>
> file format version: 2, flags 0x0
> capDate (type string): "2006:05:11 11:56:31"
> channels (type chlist):
>     a, 16-bit floating-point, sampling 1 1
>     aov_diff.b, 16-bit floating-point, sampling 1 1
>     aov_diff.g, 16-bit floating-point, sampling 1 1
>     aov_diff.r, 16-bit floating-point, sampling 1 1
>     aov_diff_tex.b, 16-bit floating-point, sampling 1 1
>     aov_diff_tex.g, 16-bit floating-point, sampling 1 1
>     aov_diff_tex.r, 16-bit floating-point, sampling 1 1
>     aov_mattes[0], 16-bit floating-point, sampling 1 1
>     aov_mattes[1], 16-bit floating-point, sampling 1 1
>     aov_mattes[2], 16-bit floating-point, sampling 1 1
>     aov_mattes[3], 16-bit floating-point, sampling 1 1
>     aov_mv.x, 16-bit floating-point, sampling 1 1
>     aov_mv.y, 16-bit floating-point, sampling 1 1
>     aov_mv.z, 16-bit floating-point, sampling 1 1
>     aov_pos.x, 16-bit floating-point, sampling 1 1
>     aov_pos.y, 16-bit floating-point, sampling 1 1
>     aov_pos.z, 16-bit floating-point, sampling 1 1
>     aov_refl.b, 16-bit floating-point, sampling 1 1
>     aov_refl.g, 16-bit floating-point, sampling 1 1
>     aov_refl.r, 16-bit floating-point, sampling 1 1
>     aov_spec.b, 16-bit floating-point, sampling 1 1
>     aov_spec.g, 16-bit floating-point, sampling 1 1
>     aov_spec.r, 16-bit floating-point, sampling 1 1
>     aov_spec_tex.b, 16-bit floating-point, sampling 1 1
>     aov_spec_tex.g, 16-bit floating-point, sampling 1 1
>     aov_spec_tex.r, 16-bit floating-point, sampling 1 1
>     aov_ssdiff.b, 16-bit floating-point, sampling 1 1
>     aov_ssdiff.g, 16-bit floating-point, sampling 1 1
>     aov_ssdiff.r, 16-bit floating-point, sampling 1 1
> clipFar (type float): 10000
> clipNear (type float): 0.001
> comments (type string): "Created using: Pixar PhotoRealistic RenderMan
> 13.0b3 (gcc333glibc233.iP4)
> Created on: dominic.v10.wvs"
> compression (type compression): piz
> dataWindow (type box2i): (0 0) - (639 479)
> displayWindow (type box2i): (0 0) - (639 479)
> lineOrder (type lineOrder): increasing y
> pixelAspectRatio (type float): 1
> screenWindowCenter (type v2f): (-7.45058e-08 2.61515e-06)
> screenWindowWidth (type float): 0.609601
> utcOffset (type float): 28800
> worldToCamera (type m44f):
>    (0.999976 0.000809668 0.00693415 0
>     -2.57635e-09 0.993252 -0.115977 0
>     0.00698126 -0.115975 -0.993228 0
>     -0.668258 -9.1114 71.5253 1)
> worldToNDC (type m44f):
>    (3.28075 0.00354185 0.00693415 0.00693415
>     -8.45257e-09 4.34493 -0.115977 -0.115977
>     0.0229044 -0.507324 -0.993228 -0.993228
>     -2.19244 -39.8573 71.5243 71.5253)
>
>
> Thanks in advance,
>
> ZiZi Zhao
>
>
>          
>
>
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