How to interpret Eigen matrix rows/columns.
Single row → scalar values.
2 rows → complex (row 0 = real, row 1 = imag)
2 rows → glm::vec2
3 rows → glm::vec3
4 rows → glm::vec4
16 rows → glm::mat4 (flattened)
Infer from row count.
Definition at line 12 of file EigenInsertion.hpp.