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Focus_To_Cursor_Blender_Addon.py

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+bl_info = {
+    "name": "Focus to Cursor",
+    "category": "Object",
+    "author": "CodeMaster7000"
+}
+
+import bpy
+import math
+from mathutils import Vector
+
+class FocusToCursor(bpy.types.Operator):
+    """Camera Focus to 3D Cursor"""
+    bl_idname = "object.focus_to_cursor"
+    bl_label = "Camera Focus to Cursor"
+    bl_options ={'REGISTER', 'UNDO'}
+    def execute(self, context):
+        scene = context.scene  
+        debug = False
+        obj_camera = bpy.context.scene.camera
+        if obj_camera is None or obj_camera.type != 'CAMERA' :
+            self.report({'ERROR'}, 'No active camera to set focus for.')
+            return {'CANCELLED'}
+        cameraLocation= obj_camera.location
+        cursorLocation= bpy.context.scene.cursor_location
+        cameraPlaneNormal = obj_camera.matrix_world.to_quaternion() * Vector((0.0, 0.0, -1.0))
+        if debug:
+            print("VectorCamera:")
+            print(cameraPlaneNormal[0])
+            print(cameraPlaneNormal[1])
+            print(cameraPlaneNormal[2])
+            print("LocationCamera:")
+            print(cameraLocation.x)
+            print(cameraLocation.y)
+            print(cameraLocation.z)
+            print("LocationCursor:")
+            print(cursorLocation.x)
+            print(cursorLocation.y)
+            print(cursorLocation.z)
+        d = (cameraPlaneNormal[0]*cameraLocation.x + cameraPlaneNormal[1]*cameraLocation.y + cameraPlaneNormal[2]*cameraLocation.z)
+        distance = (cameraPlaneNormal[0]*cursorLocation.x + cameraPlaneNormal[1]*cursorLocation.y + cameraPlaneNormal[2]*cursorLocation.z - d) / math.sqrt(cameraPlaneNormal[0]**2 + cameraPlaneNormal[1]**2 + cameraPlaneNormal[2]**2)
+        obj_camera.data.dof_distance = distance           
+        return {'FINISHED'}
+def menu_func(self, context):
+    self.layout.operator(FocusToCursor.bl_idname) 
+def register():
+    bpy.utils.register_class(FocusToCursor)
+    bpy.types.VIEW3D_MT_object.append(menu_func) 
+def unregister():
+    bpy.utils.unregister_class(FocusToCursor)
+if __name__ == "__main__":
+    register()