FAnalyzeReferencedContentStat::FLightingOptimizationStats::CalculateLightmapLightingBytesUsed

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References

static int32 CalculateLightmapLightingBytesUsed  
(  
    int32 Width,  
    int32 Height,  
    int32 NumVertices,  
    int32 UVChannelIndex  
)  
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static int32 CalculateLightmapLightingBytesUsed (     int32 Width,     int32 Height,     int32 NumVertices,     int32 UVChannelIndex )

Remarks

Assuming DXT1 lightmaps... 4 bits/pixel * width * height = Highest MIP Level * 1.333 MIP Factor for approx usage for a full mip chain Either 1 or 3 textures if we're doing simple or directional (3-axis) lightmap Most lightmaps require a second UV channel which is probably an extra 4 bytes (2 floats compressed to SHORT)