From 97244d19191af786da6de23d869a9a831616048b Mon Sep 17 00:00:00 2001
From: Dion Moult <dion@thinkmoult.com>
Date: Thu, 20 May 2021 12:53:40 +1000
Subject: [PATCH] Revisiting dumb walls - typed dumb walls now auto derive wall
 thickness from the type material

---
 .../blenderbim/bim/module/model/operator.py   | 98 ++++++++++++++++++-
 1 file changed, 96 insertions(+), 2 deletions(-)

diff --git a/src/blenderbim/blenderbim/bim/module/model/operator.py b/src/blenderbim/blenderbim/bim/module/model/operator.py
index 096e213df6..5961a85eb9 100644
--- a/src/blenderbim/blenderbim/bim/module/model/operator.py
+++ b/src/blenderbim/blenderbim/bim/module/model/operator.py
@@ -1,6 +1,9 @@
 import bpy
+import math
 import ifcopenshell
 import ifcopenshell.util.type
+import ifcopenshell.util.unit
+import mathutils.geometry
 from blenderbim.bim.ifc import IfcStore
 from mathutils import Vector
 
@@ -13,6 +16,12 @@ class AddTypeInstance(bpy.types.Operator):
         tprops = context.scene.BIMTypeProperties
         if not tprops.ifc_class or not tprops.relating_type:
             return {"FINISHED"}
+        self.file = IfcStore.get_file()
+        instance_class = ifcopenshell.util.type.get_applicable_entities(tprops.ifc_class, self.file.schema)[0]
+        if instance_class in ["IfcWall", "IfcWallStandardCase"]:
+            obj = DumbWallGenerator(self.file.by_id(int(tprops.relating_type))).generate()
+            if obj:
+                return {"FINISHED"}
         # A cube
         verts = [
             Vector((-1, -1, -1)),
@@ -40,8 +49,93 @@ class AddTypeInstance(bpy.types.Operator):
         collection = bpy.context.view_layer.active_layer_collection.collection
         collection.objects.link(obj)
         collection_obj = bpy.data.objects.get(collection.name)
-        if collection_obj:
-            obj.location[2] = collection_obj.location[2] - min(v[2] for v in obj.bound_box)
         bpy.ops.bim.assign_class(obj=obj.name, ifc_class=instance_class)
         bpy.ops.bim.assign_type(relating_type=int(tprops.relating_type), related_object=obj.name)
+        if collection_obj and collection_obj.BIMObjectProperties.ifc_definition_id:
+            obj.location[2] = collection_obj.location[2] - min([v[2] for v in obj.bound_box])
         return {"FINISHED"}
+
+
+class DumbWallGenerator:
+    def __init__(self, relating_type):
+        self.relating_type = relating_type
+
+    def generate(self):
+        unit_scale = ifcopenshell.util.unit.calculate_unit_scale(IfcStore.get_file())
+        thicknesses = []
+        for rel in self.relating_type.HasAssociations:
+            if rel.is_a("IfcRelAssociatesMaterial"):
+                material = rel.RelatingMaterial
+                if material.is_a("IfcMaterialLayerSet"):
+                    thicknesses = [l.LayerThickness for l in material.MaterialLayers]
+                    break
+        if not thicknesses:
+            return
+
+        self.collection = bpy.context.view_layer.active_layer_collection.collection
+        self.collection_obj = bpy.data.objects.get(self.collection.name)
+        self.width = sum(thicknesses) * unit_scale
+        self.height = 3
+        self.length = 1
+        self.rotation = 0
+        self.location = Vector((0, 0, 0))
+
+        if self.has_sketch():
+            return self.derive_from_sketch()
+        return self.derive_from_cursor()
+
+    def has_sketch(self):
+        return (
+            len(bpy.context.scene.grease_pencil.layers) == 1
+            and bpy.context.scene.grease_pencil.layers[0].active_frame.strokes
+        )
+
+    def derive_from_cursor(self):
+        self.location = bpy.context.scene.cursor.location
+        if self.collection:
+            for sibling_obj in self.collection.objects:
+                if not isinstance(sibling_obj.data, bpy.types.Mesh):
+                    continue
+                if "IfcWall" not in sibling_obj.name:
+                    continue
+                print("checking sibling", sibling_obj)
+                raycast = sibling_obj.closest_point_on_mesh(bpy.context.scene.cursor.location, distance=0.05)
+                print(raycast)
+                if raycast[0]:
+                    print("GOT IT!")
+                    print(raycast)
+                    # Rotate the wall in the direction of the face normal
+                    self.rotation = math.atan2(raycast[2][1], raycast[2][0])
+                    break
+        self.create_wall()
+
+    def create_wall(self):
+        verts = [
+            Vector((0, self.width / 2, 0)),
+            Vector((0, -self.width / 2, 0)),
+            Vector((0, self.width / 2, self.height)),
+            Vector((0, -self.width / 2, self.height)),
+            Vector((self.length, self.width / 2, 0)),
+            Vector((self.length, -self.width / 2, 0)),
+            Vector((self.length, self.width / 2, self.height)),
+            Vector((self.length, -self.width / 2, self.height)),
+        ]
+        faces = [
+            [1, 3, 2, 0],
+            [4, 6, 7, 5],
+            [1, 0, 4, 5],
+            [3, 7, 6, 2],
+            [0, 2, 6, 4],
+            [1, 5, 7, 3],
+        ]
+        mesh = bpy.data.meshes.new(name="Wall")
+        mesh.from_pydata(verts, [], faces)
+        obj = bpy.data.objects.new("Wall", mesh)
+        obj.location = self.location
+        obj.rotation_euler[2] = self.rotation
+        if self.collection_obj and self.collection_obj.BIMObjectProperties.ifc_definition_id:
+            obj.location[2] = self.collection_obj.location[2]
+        self.collection.objects.link(obj)
+        bpy.ops.bim.assign_class(obj=obj.name, ifc_class="IfcWall")
+        bpy.ops.bim.assign_type(relating_type=self.relating_type.id(), related_object=obj.name)
+        return obj