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If there are N values in the ranges array, the LOD group should have N+1 children.
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Specifying too few children will result in the last child being used repeatedly for the lowest levels of detail;
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if too many children are specified, the extra children will be ignored.
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Each value in the range array should be less than the previous value, otherwise results are undefined.
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FILE FORMAT/DEFAULTS
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LOD {
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range [ ] # MFFloat
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center 0 0 0 # SFVec3f
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}
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VRML2.0 has additional level field whose value is an array of nodes which are object at lebvels of detail specified
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