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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

Details

Type
Bug

Event Timeline

Vincent Girès (VincentG) raised the priority of this task from to Needs Triage by Developer.
Vincent Girès (VincentG) updated the task description. (Show Details)
Vincent Girès (VincentG) set Type to Bug.

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 Needs Triage by Developer to Normal.Feb 28 2015, 2:32 PM
Sergey Sharybin (sergey) closed this task as Archived.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!