Function skeletal_animation::math::col_mat4x3_transform_pos3

pub fn col_mat4x3_transform_pos3<T>(mat: [[T; 3]; 4], a: [T; 3]) -> [T; 3] where
    T: Copy + Add<T, Output = T> + Mul<T, Output = T>, 

Transforms a 3D position through matrix.