Re: [Openexr-devel] 3dsMax OpenEXR support

[Drew Hess]

Cool.

Greg Ward posted something to the (old Sourceforge-based?) list awhile ago
proposing some standard names and datatypes for some of these attributes.
I think he's already using them in his Photosphere application.  I've
cut-and-pasted them below for reference.

As we get more of these plugins, I think it would be in everyone's
interest if use a standard set of attributes.  Let's start with Greg's
list.  If you have things to add or would like to modify something, post
it to the list so we can get feedback from others who are developing
plugins.  (I realize as I'm writing this that our own Renderman display
driver doesn't use any of these yet.)


thanks!
-dwh-


-----

I don't know if this is the right forum, but I wanted to suggest
 standardizing the following header attributes in OpenEXR:

 "capDate"              a StringAttribute that records the date the image
                        was created/captured in standard Exif format, 
                        i.e., "YYYY:MM:DD HH:MM:SS"

 "sampToNits"           a FloatAttribute that gives the absolute scale to 
                        get from sample values to Nits (cd/m^2) for the 
                        purposes of photometric calibration

 "xDensity"             a FloatAttribute for the standard horizontal
                        output density, in pixels per inch.
                        We could also specify yDensity, but this is
                        redundant (and therefore  dangerous)
                        with respect to the existing "pixelAspect" and
                        image size information

 "xViewAngle"           a FloatAttribute for the horizontal view angle of 
                        a perspective image in degrees.
                        Again, we could have yViewAngle, but this would be
                        redundant as well

 "focus"                a FloatAttribute for the world focus distance, in
                        meters

 "owner"                a StringAttribute giving the content owner's name

 "comments"             a StringAttribute with additional image information

 Of these, the first two are the most critical as far as I'm concerned.
 Any thoughts on others?

 -Greg
 



On Tue, 15 Apr 2003, Steve Blackmon wrote:

> Greetings All,
> 
> I just wanted to drop a note to the list to mention that we are 
> finishing up an OpenEXR 3dsMax Bitmap I/O plugin.  The binary will be 
> freely available via our website in the coming few days, with builds 
> supporting 3dsMax R3,R4, and R5.  Once the plugin is released and any 
> outstanding issues are resolved, we plan to spend some extra time 
> polishing up the code, after which we would like to submit the plugin 
> source for inclusion in the OpenEXR distribution.
> 
> The plugin includes full support for writing all the standard 'g-buffer' 
> channel data from 3dsMax, including z-buffer, object id, material id, 
> velocity data, etc., with user specifiable attribute identifiers to 
> allow for maximum compatability with various compositing applications 
> and other software that supports OpenEXR.  The plugin will also provide 
> the option to embed some scene specific information in the file 
> including camera transform data and projection information such as FoV 
> and Aperture.
> 
> It's been a bit of a bumpy ride getting this working, but we're very 
> happy with the results (thanks to the great work by the folks at ILM.) 
> Great job guys, this format rocks :)
> 
> -Steve Blackmon
> 
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