Adobe Photoshop CS6 User Manual page 701

U3D and KMZ support JPEG or PNG as texture formats.
DAE and OBJ support all Photoshop-supported image formats for textures.
3. (Optional) If exporting to U3D format, choose an encoding option. ECMA 1 is compatible with Acrobat 7.0; ECMA 3 is compatible with
Acrobat 8.0 and later and provides some mesh compression.
4. Click OK to export.
Save a 3D file
To preserve 3D model position, lighting, render mode, and cross sections, save files with 3D layers in PSD, PSB, TIFF, or PDF format.
Choose File > Save or File > Save As, select Photoshop (PSD), Photoshop PDF, or TIFF format, and click OK.
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