make sun_position an optional addon for bbim

src/blenderbim/blenderbim/bim/module/light/decorator.py

@@ -21,7 +21,12 @@ import blf
 import gpu
 import bmesh
 import blenderbim.tool as tool
-import sun_position.sun_calc
+
+try:
+    import sun_position.sun_calc
+except ImportError:
+    sun_position = None
+
 from bpy.types import SpaceView3D
 from math import radians
 from mathutils import Vector, Matrix

src/blenderbim/blenderbim/bim/module/light/prop.py

@@ -20,7 +20,12 @@ import bpy
 import pytz
 import tzfpy
 import datetime
-import sun_position.sun_calc
+
+try:
+    import sun_position.sun_calc
+except ImportError:
+    sun_position = None
+
 import blenderbim.tool as tool
 from math import radians, pi
 from mathutils import Euler, Vector, Matrix, Quaternion

src/blenderbim/blenderbim/bim/module/light/ui.py

@@ -18,7 +18,12 @@
 
 import bpy
 from blenderbim.bim.module.light.data import SolarData
-from sun_position.sun_calc import format_time, format_hms, sun
+
+try:
+    import sun_position
+    from sun_position.sun_calc import format_time, format_hms, sun
+except ImportError:
+    sun_position = None
 
 
 class BIM_PT_radiance_exporter(bpy.types.Panel):
@@ -35,6 +40,10 @@ class BIM_PT_radiance_exporter(bpy.types.Panel):
         layout = self.layout
         scene = context.scene
 
+        if sun_position is None:
+            layout.label(text="Enable 'Sun Position' addon to continue.")
+            return
+
         props = scene.radiance_exporter_properties
         
         row = layout.row()
@@ -78,6 +87,10 @@ class BIM_PT_solar(bpy.types.Panel):
     bl_options = {"HIDE_HEADER"}
 
     def draw(self, context):
+        if sun_position is None:
+            self.layout.label(text="Enable 'Sun Position' addon to continue.")
+            return
+
         if not SolarData.is_loaded:
             SolarData.load()