Obvious Ways to Reduce File Size:
Reduce, Reuse, Remove!
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REDUCE the amount of data
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Beware of Textures, Audio, Movies: they can blow your budget instantly!
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A single 128x128 RGB texture is about 50KB uncompressed!
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Shrink your images
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Shorten your sound clips and lower their sample rate
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Compress, but don't rely on compression alone
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Reduce precision to 3-5 significant digits
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REUSE data
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Instance wherever possible, share AudioClips & Textures
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Use defaults instead of explicit normals, texture coords
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REMOVE data
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Get rid of anything that isn't vital to your scene
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Pare your world down to the bare essentials
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Hand-edit the file!