io_scene_3ds/export_3ds.py

@@ -54,6 +54,8 @@ MATSHINESS = 0xA040  # Specular intensity of the object/material (percent)
 MATSHIN2 = 0xA041  # Reflection of the object/material (percent)
 MATSHIN3 = 0xA042  # metallic/mirror of the object/material (percent)
 MATTRANS = 0xA050  # Transparency value (100-OpacityValue) (percent)
+MATXPFALL = 0xA052  # Transparency falloff ratio (percent)
+MATREFBLUR = 0xA053  # Reflection blurring ratio (percent)
 MATSELFILLUM = 0xA080  # # Material self illumination flag
 MATSELFILPCT = 0xA084  # Self illumination strength (percent)
 MATWIRE = 0xA085  # Material wireframe rendered flag
@@ -706,6 +708,7 @@ def make_material_chunk(material, image):
         material_chunk.add_subchunk(make_percent_subchunk(MATSHIN2, wrap.specular))
         material_chunk.add_subchunk(make_percent_subchunk(MATSHIN3, wrap.metallic))
         material_chunk.add_subchunk(make_percent_subchunk(MATTRANS, 1 - wrap.alpha))
+        material_chunk.add_subchunk(make_percent_subchunk(MATXPFALL, wrap.transmission))
         material_chunk.add_subchunk(make_percent_subchunk(MATSELFILPCT, wrap.emission_strength))
         material_chunk.add_subchunk(shading)
 

io_scene_3ds/import_3ds.py

@@ -361,6 +361,7 @@ def process_next_chunk(context, file, previous_chunk, imported_objects, CONSTRAI
     contextColor = None
     contextWrapper = None
     contextMatrix = None
+    contextTransmission = None
     contextMesh_vertls = None
     contextMesh_facels = None
     contextMesh_flag = None
@@ -537,6 +538,7 @@ def process_next_chunk(context, file, previous_chunk, imported_objects, CONSTRAI
         contextWrapper.base_color = contextColor[:]
         contextWrapper.metallic = contextMaterial.metallic
         contextWrapper.roughness = contextMaterial.roughness
+        contextWrapper.transmission = contextTransmission
         contextWrapper.specular = contextMaterial.specular_intensity
         contextWrapper.specular_tint = contextMaterial.specular_color[:]
         contextWrapper.emission_color = contextMaterial.line_color[:3]
@@ -905,6 +907,7 @@ def process_next_chunk(context, file, previous_chunk, imported_objects, CONSTRAI
         # If material chunk
         elif new_chunk.ID == MATERIAL:
             contextAlpha = True
+            contextTransmission = False
             contextColor = mathutils.Color((0.8, 0.8, 0.8))
             contextMaterial = bpy.data.materials.new('Material')
             contextWrapper = PrincipledBSDFWrapper(contextMaterial, is_readonly=False, use_nodes=False)
@@ -993,6 +996,14 @@ def process_next_chunk(context, file, previous_chunk, imported_objects, CONSTRAI
                 contextMaterial.blend_method = 'BLEND'
             new_chunk.bytes_read += temp_chunk.bytes_read
 
+        elif new_chunk.ID == MAT_XPFALL:
+            read_chunk(file, temp_chunk)
+            if temp_chunk.ID == PCTI:
+                contextTransmission = float(read_short(temp_chunk) / 100)
+            else:
+                skip_to_end(file, temp_chunk)
+            new_chunk.bytes_read += temp_chunk.bytes_read
+
         elif new_chunk.ID == MAT_SELF_ILPCT:
             read_chunk(file, temp_chunk)
             if temp_chunk.ID == PCT_SHORT:
@@ -1010,6 +1021,7 @@ def process_next_chunk(context, file, previous_chunk, imported_objects, CONSTRAI
                 contextWrapper.base_color = contextColor[:]
                 contextWrapper.metallic = contextMaterial.metallic
                 contextWrapper.roughness = contextMaterial.roughness
+                contextWrapper.transmission = contextTransmission
                 contextWrapper.specular = contextMaterial.specular_intensity
                 contextWrapper.specular_tint = contextMaterial.specular_color[:]
                 contextWrapper.emission_color = contextMaterial.line_color[:3]

sun_position/__init__.py

@@ -18,7 +18,7 @@
 bl_info = {
     "name": "Sun Position",
     "author": "Michael Martin, Damien Picard",
-    "version": (3, 5, 3),
+    "version": (3, 5, 4),
     "blender": (3, 2, 0),
     "location": "World > Sun Position",
     "description": "Show sun position with objects and/or sky texture",

sun_position/hdr.py

@@ -78,7 +78,19 @@ class SUNPOS_OT_ShowHdr(bpy.types.Operator):
     @classmethod
     def poll(self, context):
         sun_props = context.scene.sun_pos_properties
-        return sun_props.hdr_texture and sun_props.sun_object is not None
+        if sun_props.sun_object is None:
+            self.poll_message_set("Please select a Sun object")
+            return False
+        if not sun_props.hdr_texture:
+            self.poll_message_set("Please select an Environment Texture node")
+            return False
+
+        nt = context.scene.world.node_tree.nodes
+        env_tex_node = nt.get(context.scene.sun_pos_properties.hdr_texture)
+        if env_tex_node is None or env_tex_node.type != "TEX_ENVIRONMENT":
+            self.poll_message_set("Please select a valid Environment Texture node")
+            return False
+        return True
 
     def update(self, context, event):
         sun_props = context.scene.sun_pos_properties

sun_position/properties.py

@@ -116,6 +116,7 @@ class SunPosProperties(PropertyGroup):
         description="Enter coordinates from an online map",
         get=get_coordinates,
         set=set_coordinates,
+        default="00°00′00.00″ 00°00′00.00″",
         options={'SKIP_SAVE'})
 
     latitude: FloatProperty(