Release: PathSample Fixes + Viridis #2444
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Resolve #2446 by falling back to [`linear_color_map`](https://github.com/mikedh/trimesh/blob/d8c75b576bf0c6c5c8e263956332b2e50bc2775e/trimesh/visual/color.py#L841) if `matplotlib` is not available.
- Adds `viridis` from the primary source [here](https://github.com/BIDS/colormap/blob/master/option_a.py) which is available under waived copyright [license](https://github.com/BIDS/colormap/blob/master/LICENSE.txt) and make `viridis` the default color map - Enable `linear_color_map` to support arbitrary `color_range` lengths and interpolate from that, rather than just interpolating between two colors. - fix #2446 - Adds a simple helper `Trimesh.subdivide(iterations: int)` argument to avoid the `mesh.subdivide().subdivide().subdivide()` <img width="1789" height="1429" alt="Screenshot from 2025-08-31 15-23-06" src="https://github.com/user-attachments/assets/dcead8a1-d9b6-4b74-820e-c0c1acfb93e8" />
I hope this makes sense for trimesh as a whole. It would greatly improve ergonomics for me :) This addition will only concatenate vertex and face attributes if all keys are found in all meshes. An alternative is discarding attributes that are not in all meshes and concatenating the rest.
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viridisthe default color map intrimesh.visual.color.interpolateand enables linear interpolation with more than two values intrimesh.visual.color.linear_color_map. This adds a 20kb JSON copy of the lookup table for viridis rather than depending onmatplotlibto avoid the 50mb of added dependencies. Fixes Missingmatplotlibdependency #2446gzipfiles intrimesh.resources.get_json.gzipwon the decompress-speed benchmark by a fair bit on my machine compared tobz2andlzmaalthough it had worse compression.