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How to use LEVELS.INI:
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[MIRRORS] section
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The [MIRRORS] section lists all the floor mirrors definitions.
Example:
Nb= 2							<-- There are 2 mirrors definitions in the section
mirror1= 11 0.5					<-- Parameter are; sector ID & reflection coeff
mirror2= 0 0.7

You can find the sector ID with a level editor like DEU or ZETH.
The reflection coeff values are between 0.0 (totally reflective) & 1.0 (no reflection)
...

[<MAP>] sections
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This section allows you to add special effects to a level.
The name of the section is the name of the level.

mirrors= <mirror1> <mirror2> ...
This line lists all the mirrors present in the level.

Example:
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[E1M1]
mirrors= mirror1 mirror2

The floor of E1M1's Sector 11 will be a mirror with a 0.5 reflection coeff.
The floor of E1M1's Sector 0 will be a mirror with a 0.7 reflection coeff.