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I need to export some .blend files into COLLADA. Unfortunately, all polygons are designed double sided. In order to properly use culling within my 3D application, I need all polygons to face outwards.

Whenever I switch to the "Object Data" menu and uncheck "Double Sided", everything looks fine. But after exporting to collada and re-importing to Blender, "Double Sided" is checked again. Maybe there is another way to let all faces face outwards?

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in Edit Mode press Recalculate Normals in Toolbar (press T to show it): enter image description here

It's usually better not to see backfaces. You can turn them off in 3D View Properties Panel (press N to show it):

enter image description here

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    $\begingroup$ Before doing this, a user needs to select all faces (A hotkey toggles). It's also worth mentioning that this feature is accessible with the Ctrl+N hotkey in Edit mode. $\endgroup$ – Fweeb Nov 6 '13 at 19:18
  • $\begingroup$ Thanks! This helped a lot! Unfortunately, some faces still face in the wrong direction, but this may be because the vertices are defined in the wrong order. $\endgroup$ – Uli Holtmann Nov 6 '13 at 22:37

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