doubt about configuration values of lightmap

[QQfoolsorellina]

I'm making a similar undersea cave map( such as iz_dun00 ), when I put lightmap on map ,it appears ladder-like lightmap and shadow as shown in figure below,
who know the reason why? if it's a issue of lightmap, can someone tell me what the value of lightmap should i input on an undersea cave map?

Edited December 6, 2016 by QQfoolsorellina

[Azura Skyy]

1 hour ago, QQfoolsorellina said:

I'm making a similar undersea cave map( such as iz_dun00 ), when I put lightmap on map ,it appears ladder-like lightmap and shadow as shown in figure below,
who know the reason why? if it's a issue of lightmap, can someone tell me what the value of lightmap should i input on an undersea cave map?

Change the 'Light Falloff' value to 0.1

Hope this helps,
~Azura Skyy