**System Information**
platform: b'Linux'
renderer:'Mesa DRI Intel(R) Sandybridge Mobile '
vendor:'Intel Open Source Technology Center'
**Blender Version**
Broken: version 2.71 (sub 6), branch b'master', commit date b'2014-09-19' b'20:25', hash b'31da725', b'Debug'
Worked: never? (not sure)
**Short description of error**
viewvectors (returned by view3d_utils.region_2d_to_vector_3d) for persp/ortho views are pointing in opposite directions...
(wrong direction in case of ortho imo)
(plus returned vector is not normalized in case of perspective)
- also attached a little patch that hopefully fixes this (not sure if this break existing scripts though...)
**Exact steps for others to reproduce the error**
please see attached blend (has lots more information, script and steps to reproduce)