Import and init cleanup

All imports made explicit
All redundant and unused imports removed
All circular import errors resolved

Imports alphabetized and sorted by source, in the following order: 
- Python Standard Library
- pip Packages
- Blender Libraries
- cam Modules (from .)

init split into multiple files:
New:
- cam_operation
- chain
- engine
- machine_settings
- preset_managers

Existing:
- pack
- slice
- ui
- utils

Rewrote get_panels to remove legacy panels and updated to follow Blender's guide: https://docs.blender.org/api/current/bpy.types.RenderEngine.html

scripts/addons/cam/opencamlib/oclSample.py

@@ -1,18 +1,21 @@
-import os
+from math import (
+    radians,
+    tan
+)
+
 try:
     import ocl
 except ImportError:
     try:
         import opencamlib as ocl
     except ImportError:
         pass
-import tempfile
 
 from io_mesh_stl import blender_utils
 import mathutils
-import math
+
 from ..simple import activate
-from ..exception import *
+from ..exception import CamException
 from ..async_op import progress_async
 
 OCL_SCALE = 1000.0
@@ -50,9 +53,9 @@ async def ocl_sample(operation, chunks, use_cached_mesh=False):
     op_cutter_type = operation.cutter_type
     op_cutter_diameter = operation.cutter_diameter
     op_minz = operation.minz
-    op_cutter_tip_angle = math.radians(operation.cutter_tip_angle)/2
+    op_cutter_tip_angle = radians(operation.cutter_tip_angle)/2
     if op_cutter_type == "VCARVE":
-        cutter_length = (op_cutter_diameter/math.tan(op_cutter_tip_angle))/2
+        cutter_length = (op_cutter_diameter/tan(op_cutter_tip_angle))/2
     else:
         cutter_length = 10
 

scripts/addons/cam/opencamlib/opencamlib.py

@@ -1,25 +1,24 @@
 # used by OpenCAMLib sampling
+import os
+from subprocess import call
+import tempfile
 
-import bpy
+import numpy as np
 try:
     import ocl
 except ImportError:
     try:
         import opencamlib as ocl
     except ImportError:
         pass
-import os
-import tempfile
-import numpy as np
 
-from subprocess import call
-from ..collision import BULLET_SCALE
-from .. import simple
+import bpy
+
+from ..constants import BULLET_SCALE
+from ..simple import activate
 from .. import utils
-from ..chunk import camPathChunk
-from ..simple import *
+from ..cam_chunk import camPathChunk
 from ..async_op import progress_async
-from shapely import geometry as sgeometry
 from .oclSample import (
     get_oclSTL,
     ocl_sample
@@ -146,12 +145,12 @@ def oclWaterlineLayerHeights(operation):
     return layers
 
 
-def oclGetMedialAxis(operation, chunks):
-    oclWaterlineHeightsToOCL(operation)
-    operationSettingsToOCL(operation)
-    curvesToOCL(operation)
-    call([PYTHON_BIN, os.path.join(bpy.utils.script_path_pref(), "addons", "cam", "opencamlib", "ocl.py")])
-    waterlineChunksFromOCL(operation, chunks)
+# def oclGetMedialAxis(operation, chunks):
+#     oclWaterlineHeightsToOCL(operation)
+#     operationSettingsToOCL(operation)
+#     curvesToOCL(operation)
+#     call([PYTHON_BIN, os.path.join(bpy.utils.script_path_pref(), "addons", "cam", "opencamlib", "ocl.py")])
+#     waterlineChunksFromOCL(operation, chunks)
 
 
 async def oclGetWaterline(operation, chunks):