Function compose_trs_to_mat4_scalar 

pub fn compose_trs_to_mat4_scalar(batch: &TrsBatchSoa, out: &mut [Mat4])

Scalar twin of compose_trs_to_mat4 — identical result, one entity at a time, no SIMD. This is the fallback a caller should prefer for small batches (where the field-split transpose costs more than the vector op saves) and the equivalence oracle the SIMD path is tested against.

Panics

Panics if out.len() != batch.len().