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FTextureSource.GetMipData() won't retrieve Mips other than 0

Hello,

            TArray<uint8> rawData;
             uint32 texSizeX = landscapeTextures[l]->Source.GetSizeX()/ (Mip + 1);
             uint32 texSizeY = landscapeTextures[l]->Source.GetSizeY()/ (Mip + 1);                
             uint32 arraysize = landscapeTextures[l]->Source.GetBytesPerPixel() * (texSizeX*texSizeY);
             
             rawData.AddZeroed(arraysize);   
             
             landscapeTextures[l]->Source.GetMipData(rawData, Mip);
             
             for (int c = 0; c < rawData.Num(); c+=4)
             {
                 //rawdata is BGRA
                 FColor color = FColor(rawData[c + 2], rawData[c + 1], rawData[c], rawData[c + 3]);
                 texColors[l].Add(color);
             }

This code will return proper colors when the Mip variable is 0. Any other value for the Mip level will return 0 for all bytes in the rawData array.

I know I initialize it with AddZeroed, but the array still isn't getting filled with any byte values from the GetMipData function when Mip>0.

I even commented out that Mip bias snippet from the texSizeX and Y lines. Still nothing. Bug?

Product Version: UE 4.9
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asked Oct 04 '15 at 04:16 AM in C++ Programming

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Quantum Theory
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