Function gmsh_sys::gmshModelMeshGetJacobians

pub unsafe extern "C" fn gmshModelMeshGetJacobians(
    elementType: c_int, 
    integrationPoints: *mut f64, 
    integrationPoints_n: usize, 
    jacobians: *mut *mut f64, 
    jacobians_n: *mut usize, 
    determinants: *mut *mut f64, 
    determinants_n: *mut usize, 
    points: *mut *mut f64, 
    points_n: *mut usize, 
    tag: c_int, 
    task: usize, 
    numTasks: usize, 
    ierr: *mut c_int
)

Get the Jacobians of all the elements of type elementType classified on the entity of tag tag, at the G integration points integrationPoints given as concatenated triplets of coordinates in the reference element [g1u, g1v, g1w, ..., gGu, gGv, gGw]. Data is returned by element, with elements in the same order as in getElements and getElementsByType. jacobians contains for each element the 9 entries of the 3x3 Jacobian matrix at each integration point. The matrix is returned by column: [e1g1Jxu, e1g1Jyu, e1g1Jzu, e1g1Jxv, ..., e1g1Jzw, e1g2Jxu, ..., e1gGJzw, e2g1Jxu, ...], with Jxu=dx/du, Jyu=dy/du, etc. determinants contains for each element the determinant of the Jacobian matrix at each integration point: [e1g1, e1g2, ... e1gG, e2g1, ...]. points contains for each element the x, y, z coordinates of the integration points. If tag < 0, get the Jacobian data for all entities. If numTasks > 1, only compute and return the part of the data indexed by task.