batFINGER · April 27, 2023 15:34 · Nov 8, 2016 · Nov 8, 2016
diff --git a/Drop to ground → drop_to_ground.py b/Drop to ground → drop_to_ground.py
diff --git a/Drop to ground b/Drop to ground
@@ -0,0 +1,220 @@
+# ##### BEGIN GPL LICENSE BLOCK #####
+#
+#  This program is free software; you can redistribute it and/or
+#  modify it under the terms of the GNU General Public License
+#  as published by the Free Software Foundation; either version 2
+#  of the License, or (at your option) any later version.
+#
+#  This program is distributed in the hope that it will be useful,
+#  but WITHOUT ANY WARRANTY; without even the implied warranty of
+#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#  GNU General Public License for more details.
+#
+#  You should have received a copy of the GNU General Public License
+#  along with this program; if not, write to the Free Software Foundation,
+#  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+#
+# ##### END GPL LICENSE BLOCK #####
+
+bl_info = {
+    'name': 'Drop to Ground',
+    'author': 'Unnikrishnan(kodemax), Florian Meyer(testscreenings)',
+    'version': (1,2.5),
+    'blender': (2, 71, 0),
+    'location': '3D View -> Tool Shelf -> Object Tools Panel (at the bottom)',
+    'description': 'Drop selected objects on active object',
+    'warning': 'Before using it do :- ctrl+a -> apply rotation on the object to be dropped',
+    'wiki_url': 'http://wiki.blender.org/index.php/Extensions:2.6/Py/Scripts/Object/Drop_to_ground',
+    'tracker_url': 'http://projects.blender.org/tracker/?func=detail&atid=25349',
+    'category': 'Object'}
+
+import bpy, bmesh
+from mathutils import *
+from bpy.types import Operator
+from bpy.props import *
+
+def get_align_matrix(location, normal):
+    up = Vector((0,0,1))
+    angle = normal.angle(up)
+    axis = up.cross(normal)
+    mat_rot = Matrix.Rotation(angle, 4, axis)
+    mat_loc = Matrix.Translation(location)
+    mat_align = mat_rot * mat_loc
+    return mat_align
+
+def transform_ground_to_world(sc, ground):
+    tmpMesh = ground.to_mesh(sc, True, 'PREVIEW')
+    tmpMesh.transform(ground.matrix_world)
+    tmp_ground = bpy.data.objects.new('tmpGround', tmpMesh)
+    sc.objects.link(tmp_ground)
+    sc.update()
+    return tmp_ground
+
+def get_lowest_world_co_from_mesh(ob, mat_parent=None):
+
+    bme = bmesh.new()
+    bme.from_mesh(ob.data)
+    mat_to_world = ob.matrix_world.copy()
+    if mat_parent:
+        mat_to_world = mat_parent * mat_to_world
+    lowest=None
+    #bme.verts.index_update() #probably not needed
+    for v in bme.verts:
+        if not lowest:
+            lowest = v
+        if (mat_to_world * v.co).z < (mat_to_world * lowest.co).z:
+            lowest = v
+    lowest_co = mat_to_world * lowest.co
+    bme.free()
+    return lowest_co
+
+def get_lowest_world_co(context, ob, mat_parent=None):
+
+    if ob.type == 'MESH':
+        return get_lowest_world_co_from_mesh(ob)
+
+    elif ob.type == 'EMPTY' and ob.dupli_type == 'GROUP':
+        if not ob.dupli_group:
+            return None
+
+        else:
+            lowest_co = None
+            for ob_l in ob.dupli_group.objects:
+                if ob_l.type == 'MESH':
+                    lowest_ob_l = get_lowest_world_co_from_mesh(ob_l, ob.matrix_world)
+                    if not lowest_co:
+                        lowest_co = lowest_ob_l
+                    if lowest_ob_l.z < lowest_co.z:
+                        lowest_co = lowest_ob_l
+
+            return lowest_co
+
+def drop_objects(self, context):
+
+    ground = context.object
+    obs = context.selected_objects
+    obs.remove(ground)
+    tmp_ground = transform_ground_to_world(context.scene, ground)
+    down = Vector((0, 0, -10000))
+
+    for ob in obs:
+        if self.use_origin:
+            lowest_world_co = ob.location
+        else:
+            lowest_world_co = get_lowest_world_co(context, ob)
+        if not lowest_world_co:
+            print(ob.type, 'is not supported. Failed to drop', ob.name)
+            continue
+        hit, hit_location, hit_normal, hit_index = tmp_ground.ray_cast(lowest_world_co, lowest_world_co + down)
+        if not hit:
+            print(ob.name, 'didn\'t hit the ground')
+            continue
+
+        # simple drop down
+        to_ground_vec =  hit_location - lowest_world_co
+        ob.location += to_ground_vec
+
+        # drop with align to hit normal
+        if self.align:
+            to_center_vec = ob.location - hit_location #vec: hit_loc to origin
+            # rotate object to align with face normal
+            mat_normal = get_align_matrix(hit_location, hit_normal)
+            rot_euler = mat_normal.to_euler()
+            mat_ob_tmp = ob.matrix_world.copy().to_3x3()
+            mat_ob_tmp.rotate(rot_euler)
+            mat_ob_tmp = mat_ob_tmp.to_4x4()
+            ob.matrix_world = mat_ob_tmp
+            # move_object to hit_location
+            ob.location = hit_location
+            # move object above surface again
+            to_center_vec.rotate(rot_euler)
+            ob.location += to_center_vec
+
+    #cleanup
+    bpy.ops.object.select_all(action='DESELECT')
+    tmp_ground.select = True
+    bpy.ops.object.delete('EXEC_DEFAULT')
+    for ob in obs:
+        ob.select = True
+    ground.select = True
+
+class OBJECT_OT_drop_to_ground(Operator):
+
+    """Drop selected objects on active object"""
+    bl_idname = "object.drop_on_active"
+    bl_label = "Drop to Ground"
+    bl_options = {'REGISTER', 'UNDO'}
+    bl_description = "Drop selected objects on active object"
+
+    align = BoolProperty(
+            name="Align to ground",
+            description="Aligns the object to the ground",
+            default=True)
+    use_origin = BoolProperty(
+            name="Use Center",
+            description="Drop to objects origins",
+            default=False)
+
+    ##### POLL #####
+    @classmethod
+    def poll(cls, context):
+        return len(context.selected_objects) >= 2
+
+    ##### EXECUTE #####
+    def execute(self, context):
+        print('\nDropping Objects')
+        drop_objects(self, context)
+        return {'FINISHED'}
+
+#################################################################
+class drop_help(bpy.types.Operator):
+
+    bl_idname = 'help.drop'
+    bl_label = ''
+
+    def draw(self, context):
+        layout = self.layout
+        layout.label("To use:")
+        layout.label("Name the base object 'Ground'")
+        layout.label("Select the object/s to drop")
+        layout.label("Then Shift Select 'Ground'")
+
+    def execute(self, context):
+        return {'FINISHED'}
+
+    def invoke(self, context, event):
+        return context.window_manager.invoke_popup(self, width = 300)
+
+class Drop_Operator_Panel(bpy.types.Panel):
+
+    bl_label = "Drop To Ground"
+    bl_region_type = "TOOLS" #UI possible too
+    bl_space_type = "VIEW_3D"
+    bl_options = {'DEFAULT_CLOSED'}
+    bl_context = "objectmode"
+    bl_category = "Tools"
+
+    def draw(self,context):
+        sce = context.scene
+        layout = self.layout
+        row = layout.row()
+        row = layout.split(0.80)
+        row.operator(OBJECT_OT_drop_to_ground.bl_idname, text="Drop to Ground")
+        row.operator('help.drop', icon = 'INFO')
+
+# Register the class:
+def register():
+
+    bpy.utils.register_module(__name__)
+
+    pass
+
+def unregister():
+
+    bpy.utils.unregister_module(__name__)
+
+    pass
+
+if __name__ == "__main__":
+
+    register()
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