The addon is updated for Eevee/Cycles - part 1: the atoms get now a useful color

by using nodes (material properties). The color used in the viewport shading
('solid mode') has been removed since it doesn't make sense anymore. Otherwise
one always has to manually choose 'using nodes' in the material properties.

io_mesh_atomic/pdb_import.py

@@ -769,6 +769,9 @@ def draw_sticks_dupliverts(all_atoms,
 
     if use_sticks_color == False:
         stick_material = bpy.data.materials.new(ELEMENTS[-1].name)
+        stick_material.use_nodes = True
+        mat_P_BSDF = stick_material.node_tree.nodes['Principled BSDF']
+        mat_P_BSDF.inputs['Base Color'].default_value = ELEMENTS[-1].color
         stick_material.diffuse_color = ELEMENTS[-1].color
 
     # Sort the sticks and put them into a new list such that ...
@@ -1057,6 +1060,9 @@ def draw_sticks_skin(all_atoms,
     new_stick_mesh.modifiers[1].render_levels = sticks_subdiv_render
 
     stick_material = bpy.data.materials.new(ELEMENTS[-1].name)
+    stick_material.use_nodes = True
+    mat_P_BSDF = stick_material.node_tree.nodes['Principled BSDF']
+    mat_P_BSDF.inputs['Base Color'].default_value = ELEMENTS[-1].color
     stick_material.diffuse_color = ELEMENTS[-1].color
     new_stick_mesh.active_material = stick_material
 
@@ -1112,6 +1118,9 @@ def draw_sticks_normal(all_atoms,
                        coll_molecule):
 
     stick_material = bpy.data.materials.new(ELEMENTS[-1].name)
+    stick_material.use_nodes = True
+    mat_P_BSDF = stick_material.node_tree.nodes['Principled BSDF']
+    mat_P_BSDF.inputs['Base Color'].default_value = ELEMENTS[-1].color
     stick_material.diffuse_color = ELEMENTS[-1].color
 
     up_axis = Vector([0.0, 0.0, 1.0])
@@ -1336,8 +1345,10 @@ def import_pdb(Ball_type,
     # (e.g. hydrogen)
     for atom_type in atom_all_types_list:
         material = bpy.data.materials.new(atom_type[1])
+        material.use_nodes = True
+        mat_P_BSDF = material.node_tree.nodes['Principled BSDF']
+        mat_P_BSDF.inputs['Base Color'].default_value = atom_type[2]
         material.name = atom_type[0]
-        material.diffuse_color = atom_type[2]
         atom_material_list.append(material)
 
     # Now, we go through all atoms and give them a material. For all atoms ...

io_mesh_atomic/xyz_import.py

@@ -487,8 +487,10 @@ def import_xyz(Ball_type,
         # Take the first atom
         atom = atoms_of_one_type[0]
         material = bpy.data.materials.new(atom.name)
+        material.use_nodes = True
+        mat_P_BSDF = material.node_tree.nodes['Principled BSDF']
+        mat_P_BSDF.inputs['Base Color'].default_value = atom.color
         material.name = atom.name
-        material.diffuse_color = atom.color
         atom_material_list.append(material)
 
     # Now, we go through all atoms and give them a material. For all atoms ...