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Z depth / normal render passe with volume material is wrong
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Description

System Information
Ubuntu 14.04 / Windows 7 - 64bits

Blender Version
Broken: Any

Short description of error
The Z depth and normal passes of a Cycles volume material displays only the domain of the volume instead of the volume shape (density).

http://img11.hostingpics.net/pics/284023zdepthvolume.png

I know this is not possible to get the real depth of a volume unless deep image are supported but at least it would be possible to get something closer to the volume shape. For example : a Z depth with non transparent values, only the first "hit" that the camera see.

This is not correct but something like that : http://img11.hostingpics.net/pics/378248depthnotransparency.png

Exact steps for others to reproduce the error
Just create any volume material and activate the Z passes

Event Timeline

Vincent Girès (VincentG) raised the priority of this task from to 90.
Vincent Girès (VincentG) updated the task description. (Show Details)
Vincent Girès (VincentG) edited a custom field.

Pretty sure this will not be considered a bug, but let's see what Sergey says here.

Bastien Montagne (mont29) lowered the priority of this task from 90 to Normal.Feb 28 2015, 2:32 PM
Sergey Sharybin (sergey) changed the task status from Unknown Status to Unknown Status.Mar 9 2015, 1:03 PM

That'd be indeed much more useful if depth was measured to non-zero density point of the smoke, but it's not totally trivial and not considered a bug. It goes to our TODO list there: http://wiki.blender.org/index.php/Dev:2.6/Source/Render/Cycles/ToDo#Smaller_Features

Thanks for the report anyway!