Function find_closest_block 

pub fn find_closest_block(
    blocks: &[Block],
    centroid: [Float; 3],
    direction: &str,
    minvalue: bool,
) -> Option<(usize, Float, Float, Float)>

Find the block whose centroid is closest to an extrapolated target.

Arguments

• blocks - Candidate blocks.
• centroid - Reference centroid for the entire assembly.
• direction - Axis name controlling the search direction.
• minvalue - When true, search toward the minimum extreme; otherwise the maximum.

Returns

The selected block index and the target coordinates used for the comparison.