0€ *†H†÷  €0€1 0 +0€ *†H†÷  €$€‚Content-Type: multipart/mixed; boundary="----=_NextPart_000_0156_01D0F6DA.404FCF20" X-MS-TNEF-Correlator: 000000004C3095AEEC71924DAA05D2C003FA597007009A4A75F9334F4A44B916A48254764F6C0000014971B10000475AD503384A4C46A372F8837FA72C2700178E7A9E1F0000 This is a multipart message in MIME format. ------=_NextPart_000_0156_01D0F6DA.404FCF20 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Robert While continuing to build a model that results in the problem, I discovered something I didn't see before. The IVE model had an incorrect number of mipmap levels (it had 8) for a 32x32 texture. It makes sense that glTexStorage2D would generate INVALID_OPERATION in this case. Rebuilding the model from a source with uncompressed textures and recompressing the textures worked. The original model was converted with a much older version of OSG, pre OSG 3 for sure. So I was barking up the wrong tree:) That addresses my specific issue without needing a change to OSG 3.4.0. However, I still think it is worth trying for the OSX case. Trajce In osg/Texture.cpp, function applyTexImage2D(), find the line: useTexStorage &= sizedInternalFormat != 0; add the following after the line: if ( useTexStorage && compressed_image && numMipmapLevels > 2 ) { numMipmapLevels -= 2; } This is clearly not production quality as it assumes block size is 4 and complete mipmaps to 1x1. It should be enough to check the approach. You may have to set GL_TEXTURE_MAX_LEVEL if the driver thinks the texture is incomplete, but I didn't have that issue. 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