Python bpy_extras.view3d_utils.region_2d_to_location_3d() Examples

def move_bp(self, context, cm, fm):
    em = bpy.data.objects['Empty for BProjection']

    deltax = cm.x - round(fm.x)
    deltay = cm.y - round(fm.y)

    sd = context.space_data
    l = sd.region_3d
    vr = l.view_rotation.copy()
    vr.invert()

    v_init = Vector((0.0, 0.0, 1.0))

    pos = [-deltax, -deltay]
    v = view3d_utils.region_2d_to_location_3d(context.region, l, pos, v_init)
    pos = [0, 0]
    vbl = view3d_utils.region_2d_to_location_3d(context.region, l, pos, v_init)
    loc = vbl - v

    loc.rotate(vr)

    em.custom_location -= loc

    self.first_mouse = cm 

def set_initial_view(self, context, event):
        rv3d = context.region_data
        region = context.region
        self.initial_mouse = Vector((
            event.mouse_region_x,
            event.mouse_region_y))
        self.initial_mouse_location_3d = (
            view3d_utils.region_2d_to_location_3d(
                region, rv3d, self.initial_mouse, Vector()))

        self.initial_mouse_location_2d = (
            space_to_view_vector(
                self.camera_orientation,
                self.initial_mouse_location_3d))

        self.draw_start = self.initial_mouse
        self.draw_end = self.initial_mouse 

def pan(ary):
        #get reference to all the areas
        area = bpy.context.window_manager.windows[0].screen.areas[1]
        viewport = area.regions[4]
        rv3d = area.spaces[0].region_3d
        
        #convert view location's 3D Cords to 2D Cords
        locCord = rv3d.view_location
        cord =  view3d_utils.location_3d_to_region_2d(viewport, rv3d, locCord)
        
        cord[0] += float(ary[1])
        cord[1] += float(ary[2])
        
        #convert 2d cords to 3d Cords and apply
        vec = view3d_utils.region_2d_to_vector_3d(viewport, rv3d, cord)
        loc = view3d_utils.region_2d_to_location_3d(viewport, rv3d, cord, vec)
        rv3d.view_location = loc 

def get_point_under_mouse(context,event):
    viewport_region = context.region
    viewport_region_data = context.space_data.region_3d
    viewport_matrix = viewport_region_data.view_matrix.inverted()
    
    # Shooting a ray from the camera, through the mouse cursor towards the grid with a length of 100000
    # If the camera is more than 100000 units away from the grid it won't detect a point
    ray_start = viewport_matrix.to_translation()
    ray_depth = viewport_matrix @ Vector((0,0,-100000))
    
    # Get the 3D vector position of the mouse
    ray_end = view3d_utils.region_2d_to_location_3d(viewport_region,viewport_region_data, (event.mouse_region_x, event.mouse_region_y), ray_depth )
    
    # A triangle on the grid plane. We use these 3 points to define a plane on the grid
    point_1 = Vector((0,0,0))
    point_2 = Vector((0,1,0))
    point_3 = Vector((1,0,0))
    
    # Create a 3D position on the grid under the mouse cursor using the triangle as a grid plane
    # and the ray cast from the camera
    return mathutils.geometry.intersect_ray_tri(point_1,point_2,point_3,ray_end,ray_start,False ) 

def screen_to_world(context, x, y):
    depth_vector = view3d_utils.region_2d_to_vector_3d(\
        context.region, context.region_data, [x,y])
    vector = view3d_utils.region_2d_to_location_3d(\
        context.region, context.region_data, [x,y], depth_vector)

    return(vector)


# turn 3d world coordinates vector into screen coordinate integers (x,y) 

def invoke(self, context, event):
        em = bpy.data.objects['Empty for BProjection']
        context.window_manager.modal_handler_add(self)
        self.first_mouse = Vector((event.mouse_region_x, event.mouse_region_y))

        sd = context.space_data
        l = sd.region_3d
        v_init = Vector((0.0, 0.0, 1.0))
        context.scene.cursor_location = view3d_utils.region_2d_to_location_3d(
                                                    context.region, l,
                                                    [event.mouse_region_x,
                                                     event.mouse_region_y], v_init
                                                    )

        self.first_location = em.custom_location.copy()

        self.v_offset = Vector((context.region.width, context.region.height)) - Vector((event.mouse_region_x,
                                                                                        event.mouse_region_y))
        move_bp(self, context, Vector((event.mouse_region_x, event.mouse_region_y)) - self.v_offset, self.first_mouse)

        em.custom_c3d = False
        self.alpha = bpy.data.materials['Material for BProjection'].alpha

        em.custom_location.z = -10

        bpy.data.materials['Material for BProjection'].alpha = 0

        bpy.ops.paint.image_paint(stroke=[{"name": "", "location": (0, 0, 0),
                                           "mouse": (event.mouse_region_x, event.mouse_region_y),
                                           "pressure": 1, "pen_flip": False,
                                           "time": 0, "size": 1,
                                           "is_start": False}])
        self.step_prev = Vector((event.mouse_region_x, event.mouse_region_y))
        return {'RUNNING_MODAL'}


# Operator Class toggle the alpha of the plane 

def modal(self, context, event):
        em = bpy.data.objects[BProjection_Empty]
        deltax = event.mouse_region_x - self.first_mouse.x
        deltay = event.mouse_region_y - self.first_mouse.y

        sd = context.space_data
        r3d = sd.region_3d
        vr = r3d.view_rotation.copy()
        vr.invert()

        v_init = Vector((0.0, 0.0, 1.0))

        pos = [deltax, deltay]
        v = view3d_utils.region_2d_to_location_3d(context.region, r3d, pos, v_init)
        pos = [0, 0]
        vbl = view3d_utils.region_2d_to_location_3d(context.region, r3d, pos, v_init)
        loc = vbl - v
        sd.region_3d.view_location += loc
        loc.rotate(vr)
        if not em.custom_style_clone:
            em.custom_location += loc

        self.first_mouse.x = event.mouse_region_x
        self.first_mouse.y = event.mouse_region_y

        if event.type == 'MIDDLEMOUSE'and event.value == 'RELEASE':
            if self.tmp_level > -1:
                for sub in context.object.modifiers:
                    if sub.type in ['SUBSURF', 'MULTIRES']:
                        sub.levels = self.tmp_level
            return {'FINISHED'}

        return {'RUNNING_MODAL'} 

def mouse_coo_to_3d_loc(event, context):
    from bpy_extras.view3d_utils import region_2d_to_vector_3d, region_2d_to_location_3d
    coord = event.mouse_region_x, event.mouse_region_y
    region = context.region
    rv3d = context.space_data.region_3d
    vec = region_2d_to_vector_3d(region, rv3d, coord)
    loc = region_2d_to_location_3d(region, rv3d, coord, vec)
    return loc 

def invoke (self, context, event):
        
        viewport_region = context.region
        viewport_region_data = context.space_data.region_3d
        viewport_matrix = viewport_region_data.view_matrix.inverted()
        
        # Shooting a ray from the camera, through the mouse cursor towards the grid with a length of 100000
        # If the camera is more than 100000 units away from the grid it won't detect a point
        ray_start = viewport_matrix.to_translation()
        ray_depth = viewport_matrix @ Vector((0,0,-100000))
        
        # Get the 3D vector position of the mouse
        ray_end = view3d_utils.region_2d_to_location_3d(viewport_region,viewport_region_data, (event.mouse_region_x, event.mouse_region_y), ray_depth )
        
        # A triangle on the grid plane. We use these 3 points to define a plane on the grid
        point_1 = Vector((0,0,0))
        point_2 = Vector((0,1,0))
        point_3 = Vector((1,0,0))
        
        # Create a 3D position on the grid under the mouse cursor using the triangle as a grid plane
        # and the ray cast from the camera
        position_on_grid = mathutils.geometry.intersect_ray_tri(point_1,point_2,point_3,ray_end,ray_start,False )
        
        # Create an empty for testing
        empty = self.create_test_empty(context)
        # Place the empty on the grid under the mouse cursor
        empty.location = position_on_grid
        
        return {'FINISHED'} 

def mouseTo3d(context, x, y):
	'''Convert event.mouse_region to world coordinates'''
	if context.area.type != 'VIEW_3D':
		raise Exception('Wrong context')
	coords = (x, y)
	reg = context.region
	reg3d = context.region_data
	vec = region_2d_to_vector_3d(reg, reg3d, coords)
	loc = region_2d_to_location_3d(reg, reg3d, coords, vec) #WARNING, this function return indeterminate value when view3d clip distance is too large
	return loc 

def modal(self, context, event):
        context.area.tag_redraw()

        if event.type =='LEFT_ALT' or event.type == 'RIGHT_ALT':
            if event.value == 'PRESS': pt_buf.alt = True
            if event.value == 'RELEASE': pt_buf.alt = False
            return {'RUNNING_MODAL'}

        elif event.type =='LEFT_SHIFT' or event.type == 'RIGHT_SHIFT':
            if event.value == 'PRESS': pt_buf.shift = True
            if event.value == 'RELEASE': pt_buf.shift = False
            return {'RUNNING_MODAL'}

        elif event.type == 'MOUSEMOVE':
            if pt_buf.list_m_loc_2d != []:
                pt_buf_list_m_loc_3d_last_2d = location_3d_to_region_2d(context.region, context.space_data.region_3d, pt_buf.list_m_loc_3d[-1])

                if pt_buf.alt == True:
                    pt_buf.x = pt_buf_list_m_loc_3d_last_2d[0]
                    pt_buf.y = event.mouse_region_y
                elif pt_buf.shift == True:
                    pt_buf.x = event.mouse_region_x
                    pt_buf.y = pt_buf_list_m_loc_3d_last_2d[1]
                else:
                    pt_buf.x = event.mouse_region_x
                    pt_buf.y = event.mouse_region_y
            else:
                pt_buf.x = event.mouse_region_x
                pt_buf.y = event.mouse_region_y

        elif event.type == 'LEFTMOUSE':
            if event.value == 'PRESS':
                mouse_loc_2d = Vector((pt_buf.x, pt_buf.y))
                pt_buf.list_m_loc_2d.append(mouse_loc_2d)

                mouse_loc_3d = region_2d_to_location_3d(context.region, context.space_data.region_3d, mouse_loc_2d, pt_buf.depth_location)
                pt_buf.list_m_loc_3d.append(mouse_loc_3d)

                pt_buf.depth_location = pt_buf.list_m_loc_3d[-1]      # <----- depth location
            elif event.value == 'RELEASE':
                pass
        elif event.type == 'RIGHTMOUSE':
            context.space_data.draw_handler_remove(self._handle_px, 'WINDOW')
            self.execute(context)
            pt_buf.sws = 'off'
            return {'FINISHED'}
        elif event.type == 'ESC':
            context.space_data.draw_handler_remove(self._handle_px, 'WINDOW')
            pt_buf.list_m_loc_2d[:] = []
            pt_buf.list_m_loc_3d[:] = []
            pt_buf.depth_location = Vector((0.0, 0.0, 0.0))
            pt_buf.sws = 'off'
            return {'CANCELLED'}
        return {"PASS_THROUGH"} 

def Picking(context, event):
    # get the context arguments
    scene = context.scene
    region = context.region
    rv3d = context.region_data
    coord = event.mouse_region_x, event.mouse_region_y

    # get the ray from the viewport and mouse
    view_vector = view3d_utils.region_2d_to_vector_3d(region, rv3d, coord)
    ray_origin = view3d_utils.region_2d_to_origin_3d(region, rv3d, coord)

    ray_target = ray_origin + view_vector

    def visible_objects_and_duplis():
        for obj in context.visible_objects:
            if obj.type == 'MESH':
                yield (obj, obj.matrix_world.copy())

            if obj.dupli_type != 'NONE':
                obj.dupli_list_create(scene)
                for dob in obj.dupli_list:
                    obj_dupli = dob.object
                    if obj_dupli.type == 'MESH':
                        yield (obj_dupli, dob.matrix.copy())

            obj.dupli_list_clear()

    def obj_ray_cast(obj, matrix):
        # get the ray relative to the object
        matrix_inv = matrix.inverted()
        ray_origin_obj = matrix_inv * ray_origin
        ray_target_obj = matrix_inv * ray_target
        ray_direction_obj = ray_target_obj - ray_origin_obj
        # cast the ray
        success, location, normal, face_index = obj.ray_cast(ray_origin_obj, ray_direction_obj)
        if success:
            return location, normal, face_index
        else:
            return None, None, None

    # cast rays and find the closest object
    best_length_squared = -1.0
    best_obj = None

    # cast rays and find the closest object
    for obj, matrix in visible_objects_and_duplis():
        if obj.type == 'MESH':
            hit, normal, face_index = obj_ray_cast(obj, matrix)
            if hit is not None:
                hit_world = matrix * hit
                length_squared = (hit_world - ray_origin).length_squared
                if best_obj is None or length_squared < best_length_squared:
                    scene.cursor_location = hit_world
                    best_length_squared = length_squared
                    best_obj = obj
            else:
                if best_obj is None:
                    depthLocation = region_2d_to_vector_3d(region, rv3d, coord)
                    loc = region_2d_to_location_3d(region, rv3d, coord, depthLocation)
                    scene.cursor_location = loc 

def is_point_inside_mesh(p, obj, mult_by_mat_world=False):
    from mathutils import Vector
    p = Vector(p)
    if mult_by_mat_world:
        p = p * get_matrix_world()
    res, point, normal, face = obj.closest_point_on_mesh(p)
    p2 = point-p
    v = p2.dot(normal)
    return not(v < 0.0)


# def mouse_coo_to_3d_loc(event, context):
#     from bpy_extras.view3d_utils import region_2d_to_vector_3d, region_2d_to_location_3d
#     try:
#         # coord = event.mouse_region_x, event.mouse_region_y
#         area, region = get_3d_area_region()
#         coord = (event.mouse_x - area.x, event.mouse_y - area.y)
#         # region = context.region
#         # rv3d = context.space_data.region_3d
#         rv3d = area.spaces.active.region_3d
#         vec = region_2d_to_vector_3d(region, rv3d, coord)
#         pos = region_2d_to_location_3d(region, rv3d, coord, vec)
#     except:
#         pos = None
#         print(traceback.format_exc())
#         print("Couldn't convert mouse coo to 3d loc!")
#     return pos
#

# def mouse_coo_to_3d_loc(event, context):
#     from bpy_extras.view3d_utils import region_2d_to_vector_3d, region_2d_to_location_3d
#
#     mouse_pos = [event.mouse_region_x, event.mouse_region_y]
#
#     # Contextual active object, 2D and 3D regions
#     object = bpy.data.objects['inflated_rh']
#     region = bpy.context.region
#     region3D = bpy.context.space_data.region_3d
#
#     # The direction indicated by the mouse position from the current view
#     view_vector = region_2d_to_vector_3d(region, region3D, mouse_pos)
#     # The 3D location in this direction
#     loc = region_2d_to_location_3d(region, region3D, mouse_pos, view_vector)
#     # The 3D location converted in object local coordinates
#     loc = object.matrix_world.inverted() * loc
#     return loc