Align `update_geometry_cache!` with element caches that carry continuum-specific
data and surface scalar basis values needed for mass kernels.
- Remove unused `kernel::AbstractKernel` parameter and narrow `element_cache` to
`ContinuumElementCache`.
- Evaluate `get_basis_functions` each IP, storing `N_data` beside `∇N_data`.
- Rewrite docstring around concrete fields (`X`, `N_data`, `∇N_data`, `detJ_w`)
and zero-allocation guarantees.
Optimize update_geometry_cache! to eliminate iterator allocations and
update to use coords field.
- Add @inline to update_geometry_cache! for better inlining
- Change enumerate loop to indexed loop to avoid iterator allocation
- Add @inbounds annotation for bounds-check elimination
- Change ip.ξ to ip.coords to use new QuadraturePoint API
New file: src/domains/continuum/update_geometry_cache.jl (239 lines)
Features:
- update_geometry_cache!(geometry_cache, mesh, nodes, basis)
- Computes shape function gradients at integration points
- Computes Jacobian determinants with quadrature weights
- Part of three-phase cache update pattern
Phase 2 of assembly (Geometry preprocessing):
- Extract element node coordinates
- Evaluate basis function gradients ∇N at each integration point
- Compute Jacobian matrix J and determinant det(J)
- Multiply det(J) × weight → detJ_w for integration
- Transform ∇N from parent to physical space
This is the SECOND of three cache updates called per element:
1. update_element_cache! (DOF mapping)
2. update_geometry_cache! (Jacobian, gradients) ← THIS FILE
3. update_material_cache! (stress, tangent)
Jukka Aho