[3D][Changed] Downloaded 3D models are no longer discarded

- They are stored in ~/.cache/kibot/3d
- You can change the directory using KIBOT_3D_MODELS

CHANGELOG.md

@@ -64,6 +64,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   - Problems when trying to use groups of layers (i.e. copper)
 - Report:
   - Computed size when using circles and some arcs in the PCB edge (#375)
+### Changed
+- Downloaded 3D models are no longer discarded.
+  They are stored in ~/.cache/kibot/3d
+  You can change the directory using KIBOT_3D_MODELS
 
 ## [1.5.1] - 2022-12-16
 ### Fixed

kibot/out_base_3d.py

@@ -6,7 +6,6 @@
 from fnmatch import fnmatch
 import os
 import requests
-import tempfile
 from .misc import W_MISS3D, W_FAILDL, W_DOWN3D, DISABLE_3D_MODEL_TEXT
 from .gs import GS
 from .optionable import Optionable
@@ -86,12 +85,11 @@ class Base3DOptions(VariantOptions):
         if self._tmp_dir is None:
             self._tmp_dir = os.environ.get('KIBOT_3D_MODELS')
             if self._tmp_dir is None:
-                self._tmp_dir = tempfile.mkdtemp()
-                self._files_to_remove.append(self._tmp_dir)
+                self._tmp_dir = os.path.join(os.path.expanduser('~'), '.cache', 'kibot', '3d')
             else:
                 self._tmp_dir = os.path.abspath(self._tmp_dir)
             rel_dirs.append(self._tmp_dir)
-            logger.debug('Using `{}` as temporal dir for downloaded files'.format(self._tmp_dir))
+            logger.debug('Using `{}` as dir for downloaded 3D models'.format(self._tmp_dir))
         dest = os.path.join(self._tmp_dir, fname)
         os.makedirs(os.path.dirname(dest), exist_ok=True)
         # Is already there?