Fix bug 600 kspacefirstorder3d input modification #615
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…sensor The kspaceFirstOrder3D simulation function was unintentionally modifying the input `source` and `sensor` objects. This occurred because the internal `kWaveSimulation` object and its helper functions were operating directly on these mutable input objects. This commit addresses the issue by: 1. Modifying `kWaveSimulation.__init__` to create deep copies of the input `source` and `sensor` objects. All internal operations within `kWaveSimulation` and its helper functions (like `save_to_disk_func` and `retract_transducer_grid_size`) now use these copies. The original objects you passed remain unchanged. 2. Adding a regression test (`tests/test_kspaceFirstOrder3D_state.py`). This test verifies that critical attributes of the `source` and `sensor` objects (e.g., `source.p0`, `sensor.mask`) are not altered after calls to `kspaceFirstOrder3D`, and that the function can be called multiple times with the same input objects without error or state corruption. This ensures that the `source` and `sensor` states remain consistent, allowing them to be reused for multiple simulations or checkpointing without unexpected side effects, resolving bug #600.
…der3d-input-modification
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