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Maniphest T42041

Cycles: Camera’s focus point can be set to itself proving out of focus image.
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Description

System Information
Operating system and graphics card
Windows 7 x64
Two GTX 580

Blender Version
blender-2.70a win64 hash f93bc76 same result
blender-2.72 rc1 win64 hash eb464ee same result

Short description of error
Not so much a bug, rather an minor oversight?
While using a shallow depth of field, it is possible to select the active camera from a list of focal point objects, providing a completely out of focus image.

Removing the active camera from the list of available objects may help someone in the future by preventing confusion if the wrong object is mistakenly selected.

Exact steps for others to reproduce the error
Open Cameras focus point can be set to itself.blend
Begin Viewport render (Shift Z)
In the Camera tab, under Focus, switch between 'Cube' and 'Camera'

Cameras_focus_point_can_be_set_to_itself.blend87 KBDownload

Thank you,

David

Related Objects

Event Timeline

David Black (david_black) created this task.Oct 1 2014, 9:57 PM
David Black (david_black) raised the priority of this task from to 90.
David Black (david_black) updated the task description. (Show Details)
David Black (david_black) added a project: BF Blender.
David Black (david_black) edited a custom field.
David Black (david_black) added a subscriber: David Black (david_black).
Sergey Sharybin (sergey) claimed this task.Oct 2 2014, 10:56 AM
Sergey Sharybin (sergey) lowered the priority of this task from 90 to Normal.
Sergey Sharybin (sergey) changed the task status from Unknown Status to Unknown Status.Oct 3 2014, 11:46 AM

Just don't do this ;)

i'ts not trivial to detect what "itself" is in this context -- you can have multiple camera objects sharing the same camera datablock.

Thanks for the report, it's something which could be potentially improved but it's not a bug really.

David Black (david_black) added a comment.Oct 4 2014, 11:57 PM

Thanks Sergey for making me smile and for your feedback. In reply, I do not intend too but someone may by mistake. :)

Know you are extremely clever, so apologies in advance for the following simplistic overview. Could one solution be to replicate the real world. Imagine holding a camera parallel to a mirror, camera's selected focal point would be the cameras front lens element rather than sensor plane? Only exception, (excluding major camera faults :) ), if the camera back/front focused or the camera was manually focused at a point representing the sensor plane.

Illustrated below by placement of an Empty

Cameras_focus_point_can_be_set_to_itself_(possible_solution).blend90 KBDownload

Have a great weekend,

David