Add offscreen mesh screenshot rendering of exported exodus meshes - #146
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Add offscreen mesh screenshot rendering of exported exodus meshes#146m-frey wants to merge 1 commit into
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Pull request overview
Adds an offscreen (Agg) matplotlib-based renderer to produce PNG screenshots of the current Cubit HEX8 mesh by exporting to a temporary Exodus file, extracting exterior faces, and applying simple shading. This extends CubitPy with a convenient CubitPy.mesh_screenshot(...) helper and exposes a standalone render_mesh_screenshot(...) entry point.
Changes:
- Introduces
cubitpy.mesh_screenshot.render_mesh_screenshot(...)and_get_shaded_exterior_faces(...)to extract/shade exterior HEX8 faces and write a PNG via matplotlib. - Adds
CubitPy.mesh_screenshot(...)to export the current mesh to Exodus and render a screenshot. - Adds tests validating exterior face extraction and end-to-end screenshot generation (with matplotlib optional).
Reviewed changes
Copilot reviewed 4 out of 4 changed files in this pull request and generated 3 comments.
| File | Description |
|---|---|
| tests/test_cubitpy.py | Adds unit/integration tests for shaded exterior face extraction and PNG rendering. |
| src/cubitpy/mesh_screenshot.py | New matplotlib-based offscreen renderer for exported HEX8 meshes. |
| src/cubitpy/cubitpy.py | Adds CubitPy.mesh_screenshot(...) convenience API. |
| src/cubitpy/init.py | Re-exports render_mesh_screenshot at package level. |
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| def test_shaded_exterior_faces(): | ||
| """Check exterior face extraction and face color generation.""" | ||
| coordinates = np.array( |
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| try: | ||
| import matplotlib | ||
| except ModuleNotFoundError as err: # pragma: no cover | ||
| raise ModuleNotFoundError( | ||
| "render_mesh_screenshot needs matplotlib (pip install matplotlib)." | ||
| ) from err | ||
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|
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| matplotlib.use("Agg") | ||
| import matplotlib.pyplot as plt | ||
| from mpl_toolkits.mplot3d.art3d import Poly3DCollection |
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| from cubitpy.mesh_screenshot import render_mesh_screenshot | ||
|
|
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| exo_path = Path(cupy.temp_dir) / "cubitpy_screenshot.exo" | ||
| self.export_exo(exo_path, add_node_set_info=False) | ||
| return render_mesh_screenshot( | ||
| exo_path, png_path, skip_blocks=skip_blocks, **kwargs | ||
| ) |
Collaborator
|
@m-frey what exactly is the purpose of this new functionality? Does this really belong into CubitPy? |
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This exports the current Cubit mesh to a temporary Exodus file and renders hex blocks to PNG using matplotlib. The renderer extracts exterior hex faces, applies simple face shading, supports skipping selected block names, and exposes the functionality through CubitPy.mesh_screenshot(...).