Nearest Neighbor mode with Daysim 3.0

Dear all

I am working on different daylight simulations with Daysim 3.0. My interest
is to compare the different methods for calculating contributions from
direct sunliight. I have seen that Daysim give three options to calculate
daylight coefficients as follows:
1. Use original daylight coefficients file format
2. Use DDS file format
3. Use DDS file format with shadow testing

My query is
- Which is the way to calculate the direct luminances with the assignment
mode of 'Nearest Neighbor (NN)'?
Thanks in advance

Abigail Chi