[Bf-gamedev] Importing issues

[Bastien Montagne]

Sure! Not unit data per se, though, but a simple scale factor.  From 
what I gathered from a few "official" FBX files and web search, looks 
like reference unit in FBX is the centimeter (so 1.0 for centimeter 
values, 100.0 for meters, 2.54 for inches, etc.). Since a Blender Unit 
is considered as a meter by default in Blender, we then have to use 
'100.0' as scale factor at export time (unless the unit scale settings 
of Blender's scene is not 1.0).

And as I said, import was completely ignoring those data, as well as the 
scene frame rate.

All this was addressed in today's commits, from quick tests here it 
seems to work as expected now, but more tests with external apps are 
more than welcomed (changes will be available tomorrow in our builder 
(http://builder.blender.org/download))! ;)

Cheers,
Bastien

On 09/05/2014 17:13, Lina Halper wrote:
>
> In FBX SDK, which I understand you can’t use, they have unit 
> conversion support via this.
>
> FbxGlobalSettings via FBX Scene has GetSystemUnit that has FbxSystemUnit.
>
> So for example, this is the way to convert scene to different units,
>
> if( FbxScene->GetGlobalSettings().GetSystemUnit().GetScaleFactor() != 
> 1.0 )
>
> {
>
> KFbxSystemUnit::cm.ConvertScene( FbxScene );
>
> }
>
> So in theory, this should convert to correct unit if it was meter to 
> centimeter. But when I read this scale from Blender, it is considered 
> to be same.
>
> From this I suppose there is some way of saving units in FBX.
>
> Thanks,
>
> --Lina,
>
> *From:*bf-gamedev-bounces at blender.org 
> [mailto:bf-gamedev-bounces at blender.org] *On Behalf Of *Bastien Montagne
> *Sent:* Wednesday, May 07, 2014 1:22 PM
> *To:* bf-gamedev at blender.org
> *Subject:* Re: [Bf-gamedev] Importing issues
>
> Hi LIna,
>
> On 07/05/2014 18:46, Lina Halper wrote:
>
>     Hello,
>
>     I have a couple of question about importing part of blender. This
>     test is done using FBXs from UE4 and other sources, and these two
>     seem the biggest hurdle for us to work with blender.
>
>     1.Converting Scene issue
>     - when importing the FBX exported from UE4 to blender, we see mesh
>     is rotated.
>     - when we open this in Maya or FBX review, we don’t see this issue
>     - I’m wondering how you convert scene when imported. Do you read
>     current scene set up and convert?
>     - Now if you modify and export back out, now mesh is rotated
>
>     2.Converting Unit issue
>     - when importing FBX or Collada, if I have “import unit” option
>     off, it imports as very small (1/100^th ). If I have that option
>     on, it imports correctly.
>     - Is this intended?  How do you see your unit conversion with
>     other package?
>
> FBX import does not support units at all currently, afaik… And when 
> there are no units, again different apps have different conventions, 
> so one might export in mm when Blender will import in BlenderUnits 
> (commonly accepted as meters, though this is configurable and 
> ultimately a matter of convention, again). That’s why you have a Scale 
> setting in importers and exporters, to apply some correction if needed.
>
>
> Thanks,
>
> --Lina,
>
>
>
>
> _______________________________________________
> Bf-gamedev mailing list
> Bf-gamedev at blender.org  <mailto:Bf-gamedev at blender.org>
> http://lists.blender.org/mailman/listinfo/bf-gamedev
>
> Cheers,
> Bastien
>
>
>
> _______________________________________________
> Bf-gamedev mailing list
> Bf-gamedev at blender.org
> http://lists.blender.org/mailman/listinfo/bf-gamedev

-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.blender.org/pipermail/bf-gamedev/attachments/20140511/0f0365d1/attachment-0001.htm