# Tangents & Binormals not generated by PVRGeoPOD

**URL:** <https://forums.imgtec.com/t/tangents-binormals-not-generated-by-pvrgeopod/1439>\
**Category:** PowerVR Insider\
**Tags:** pvrgeopod, pvrshaman\
**Created:** [June 7, 2012, 5:38pm UTC](https://forums.imgtec.com/t/tangents-binormals-not-generated-by-pvrgeopod/1439 "2012-06-07T17:38:44Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![bootstrapper-2](https://sea1.discourse-cdn.com/flex015/user_avatar/forums.imgtec.com/bootstrapper-2/32/145_2.png) [@bootstrapper-2](https://forums.imgtec.com/u/bootstrapper-2)\
**Post date:** [June 7, 2012, 5:38pm UTC](https://forums.imgtec.com/t/tangents-binormals-not-generated-by-pvrgeopod/1439/1 "2012-06-07T17:38:44Z")

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Hi There,  
  
I’m using the PVRGeoPOD Blender export.   
  
I create a basic UV Sphere with all the standard defaults (i’ve also tried this with the torus mesh with same result). I then export with PVRGeoPOD.   
  
I leave all the options as default (generate tangent space is ticked)  
  
The Vertex Vector Format has Position, Normal, Tangent, Binormal (a0,a1,a2 ticked) and all the UVW0 to 7 are selected (a0, a1 ticked)  
  
I’m not sure about the UVWx values (I assume they are texture coordinates) - I left them at their default values for the export   
  
I haven’t added any textures in Blender as I was going to do all that in PVRShaman with materials.  
  
After the export I open the result in PVRShaman - I see the geometry but when I open the Data Viewer screen there is no Tangent or Binormal data in the POD.  
  
(i’ve tested this with Blender 2.61, 2.62 and the latest 2.63b versions)  
  
Am I missing something obvious?  
  
Thanks in advance for your help ![Smile]( "Smile")  
  
Andre.

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**Author:** ![Scott](https://sea1.discourse-cdn.com/flex015/user_avatar/forums.imgtec.com/scott/32/256_2.png) [@Scott](https://forums.imgtec.com/u/Scott)\
**Post date:** [June 8, 2012, 1:32pm UTC](https://forums.imgtec.com/t/tangents-binormals-not-generated-by-pvrgeopod/1439/2 "2012-06-08T13:32:13Z")

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Hi,
&nbsp;

The tangent space generation requires UV coordinates for calculating the tangents and binormals. By default, Blender doesn't create meshes with UV coordinates so I assume this is why it isn't working for you. If you add UVs to your mesh the generation should be successful.&nbsp;

&nbsp;

Thanks,

&nbsp;

Scott

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<div class="post-metadata">

**Author:** ![bootstrapper-2](https://sea1.discourse-cdn.com/flex015/user_avatar/forums.imgtec.com/bootstrapper-2/32/145_2.png) [@bootstrapper-2](https://forums.imgtec.com/u/bootstrapper-2)\
**Post date:** [June 8, 2012, 2:58pm UTC](https://forums.imgtec.com/t/tangents-binormals-not-generated-by-pvrgeopod/1439/3 "2012-06-08T14:58:14Z")

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Hi Scott, thanks for the help ![]()