[Bf-committers] Blender Film Plane

[Roger Wickes]

I'm reminded of the little-used Exposure (Exp) slider in world, that is effectively aperture x film speed (ASA) in the fact that it varies the overall amount of light. Film tonal quality is also roughly analogous to exposure's companion slider, Range. Shutter speed is roughly represented by MBlur, which for the default of .5 and a fps of 30 means 1/60th of a second. 

 --Roger


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________________________________
From: Harley Acheson <hacheson at shawnigan.ca>
To: bf-blender developers <bf-committers at blender.org>
Sent: Sat, May 15, 2010 10:37:05 AM
Subject: Re: [Bf-committers] Blender Film Plane

Matt, 

> I've been planning on fixing this stuff up for a little while now.. 
> ... should be done before final 2.5 release I think. 

Wow... that will be really nice! 

I was just a little surprised that a sensor size could be inferred, and that the 
camera “Lens mm” setting actually works in a perfectly physical way -- as 
long as you know it is a camera with a “crop factor” of 1.353. Even just 
knowing that, it is possible to convert the focal length of a real lens to the 
blender camera. 

There are other things that can be added to the camera, even if they are not 
used by the renderer. If “Aperture” (f-stop) is there it would be more convenient 
to use it as input to the Defocus node. It is conceivable that a working DOF 
node group could be inserted without needing a user to tweak it. And it would 
be easy to animate f-stop changes. 

And knowing the f-stop, sensor size, focal length, and focus distance is enough 
to get near focus distance, far focus distance, and the hyperfocal distance, which 
would all be useful to the defocus node itself to get better results. Following is a 
web page that calculates those with javascript: 

http://www.tawbaware.com/maxlyons/calc.htm 

Even a seemingly dumb setting like exposure time would be nice to have as it 
could be used in motion blur calculations 

Thanks again. Love your work... 

-- 

Regards, Harley Acheson 

Virtual Dogsbody 
Info Tech Department 
Shawnigan Lake School 
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