NOTE: this is a direct dump of https://wiki.blender.org/index.php/Dev:Source/Development/Todo/Import_Export (without cherrypicking the [still] valid items)
== Blender files and Library linking ==
 Mixing "direct" and "indirect" data not well supported T26706
 Making local data which is still used in libraries, causes problems T44321
== All Formats ==
Currently negative scales will flip faces for formats which don't store object transformations (obj, ply, stl ... etc). T35892
== FBX ==
== Alembic ==
 While Alembic exports particles as points and supports ParticleInstance modifiers it could also support particle duplication (dupliobjects etc.), see T54703
== OpenCollada ==
Moving opencollada bugs to TODO has been done since this has so far not yet been effectively maintained.
This is not a step to remove collada support, however if in the next year there is little work done in this area we may have to reconsider.
I propose the first goal to get blender exporting armatures, animation & geometry to 1 application successfully as a first goal.
Since the 2.4x python script was capable of this, it should not be so hard.
Export to SecondLife can be our first target, this has the advantage that secondlife is opensource therefor easier to get hold of for testing.
=== Plans ===
==== Short term goals (Blender 2.64) ====
 Make export and Import more robust. Idealy reimport of an exported collada file should recreate the original data.
 Organize module testing. Please feel free to provide test cases and results on the Export page (dead link)
==== Long term goals ====
 Investigate in ways to improve the Collada module. Currently 3 possible approaches are investigated:
 Fix the current Bugs and make the OpenCollada based module stable and fit for purpose
 Refactor/Rewrite the module based on OpenCollada
 Create a Python based solution. ([[ https://wiki.blender.org/index.php/Dev_talk:Ref/Release_Notes/2.62/Collada | some comments ]])
=== Feature set on the GUI ===
Curent state (june 2012)
Planned (to be approved)
 Selection Only
 Include Children (regardless of selection state)
 Include Armatures
 Use Object instantiation
 Export for Second Life
=== Application Support ===
Here we collect which Apps Work, Which have issues.
Currently the list is in relation to Blender revision
43930 (pre 2.62)
==== Collada compatibility ====
| Target System | Static Meshes | Armatures | Animation | Comment
| ----- | ----- | ----- | -----
| Blender | OK | Error| ? | Import issues will be fixed after 2.62
| Second Life | OK | OK | n.a. | in depth tests in progress
| Maya 2012 | ? | ? | ?. | Waiting for response from Tester
====Test files ====
=== Tracker Reports ===
Reports which have been verified by the reporter as "resolved", will be removed from this list.
=== Export: Bugs ===
 T29672 export bone to collada file, the transform matrix is not right
 T29345 Collada exported files including bones do not work if imported into Vue...
: needs access to Vue
 T28662 Collada export, broken animation track name IDs
: "name" attributes of nodes are not properly escaped
 T25527 COLLADA export issues
 T40410 [Collada Animation Exporter] Consider armature's world matrix as identity
 T42327 Collada exporter transformation "both" option is wrong
 T43297 Unicode Breaks Collada Export
==== Export: missing features or not a Collada issue ====
 T29465 Collada - Armature Export Bug
: export skinned mesh with constraints not supported
 T22388 Collada Export assigns improper ids to skin controllers when more than one.
: request for IK export support and a <b>user option</b> for switching between sampled and interpolated animation
 T27789 B258 > Collada Export > library linked groups not exported
 T27161 COLLADA: Export problem when activating transparency
 T27389 Collada exporter ignores bones affected by IK
 T24759 Export of armature with multiple objects creates invalid .dae
 T35499 Collada exporter: Redundancy in UV coordinating.
 T36675 COLLADA import : normal map material binding doesn't work.
 T39224 Scale problem in exporting files
 T39681 Collada exporter does not support more than one action
 T39837 Collada Export writes Material Alpha Chanel data, but does not reads it
 T43298 Collada Export does not include Vertex Binormals
=== Import: Bugs ===
 T32652 Import from Lightwave creates Error when rendering with LuxRender
 T32392 import fails for transparency and reflectivity
 T31682 Collada ex- and reimport, textures gets lost, some errors (export part resolved in version 50556)
 T31728 Collada crash after import
 T31089 Collada crash after import
 T30301 Collada import data leak?
 T30008 COLLADA Import: Visual scene node hierarchy / root not handled correctly
 T29013 Import Collada causes Blender not responding
 T28894, T29058 COLLADA import crash
 T38343 Import of non-specular materials not working correct.
: validation errors
: fails to import in FXComposer-2.5
: fails to validate in GoogleSketchup, but imports well there
: segfault (probably due to wrong memory writes)
: complex. needs lots of time to debug
 T28887 COLLADA import and texture paths
 T28762 COLLADA import transparency
 T28378 Importing COLLADA file not importing as expected.
 T28242 Collada import changes units to Metric
 T27629 COLLADA import does wrong transofrmations
: transformation errors (non-skin), nice attachments
: single chair imports well in Meshlab and FXComposer-2.5
: the chair now imports well
: <node id="ID2045"> - the wheel - contains multiple <instance_geometry>s - test case
 T27128 Collada files from this camera tracking app for iPhone are not being imported correctly
 T26012 Import Collada: instance_node incorrectly handled
 T25754 COLLADA skinned animation import error
: animated avatar imports well in FXComposer-2.5
 T25432 Collada - up_axis not processed
 T22689 Collada import not importing animations if skins do not exist
 T22495 Collada importer bugs
 T39099 Collada/Mixamo Importing Bug
 T39379 Collada Cannot Import
 T40127 Newly inserted keyframes dont work in animated COLLADA models
 T40374 Collada Import - Bone Duplication
==== Import: missing features ====
 T29014 Import Collada: cannot load dae referencing other dae
 T34447 camera data broken (missing softimage support)
=== Round trip issues (reimport to blender broken) ===
 T32549 Collada don't export properly
 T28215 blender 2.59rc - Export collada - import collada - armature bones with inverted axis
=== Resolved & closed ===
 T30724 COLLADA export material name is wrong
 T28424 Blender >= 2.57 crashing when importing collada files created using GoogleSketchUp (ver 8)
: no crash as of r. 44615
: validation errors in both files (OpenCollada compiled with expat parser)
: crash on first file when testing on Linux
 T27640 COLLADA - Issue exporting geometries with just points or lines.
 T22891 Collada exports bezier keyframes as linear
 T20634 Collada export exporting -tive z scale as wrong x rotation
 T32843 AFTER 2.65 - Collada Spotlight angle animation is in radians not degrees