tailieunhanh - adobe flash cs5 on demand part 47

Sử dụng Inverse Kinematics Nghịch đảo động học (IK) cho phép bạn căng và uốn cong các đối tượng hình dạng và các nhóm liên kết của các trường hợp biểu tượng để làm cho chúng di chuyển cùng nhau theo những cách tự nhiên bằng cách sử dụng một cấu trúc bên trong của xương để tạo ra nhân vật hoạt hình. | Using Inverse Kinematics Inverse Kinematic IK allows you to stretch and bend shape objects and link groups of symbol instances to make them move together in naturalistic ways using an internal structure of bones to create character animation. You can add bones to the interior of a shape or to separate symbol instances. When you move one bone the other connected bones move in relation to the one that initially moved. A chain of bones is called an armature which is either linear or branched in structure. There are two types of Inverse Kinematic animation those with symbols and those with shapes. For the symbol type you link them together as a chain. For the shape type you add bones inside the shape. When you add bones to a shape or symbol instance Flash creates a new layer called a pose layer. For a shape Flash also converts the selected shapes and bones into an IK shape object. Each pose layer can contain only one armature. The first bone in an armature is the root bone. It appears with a circle around the head of the bone. Each bone has a head the round end and a tail known as the pointed end. After you add bones to an armature you can change the position and length of a bone delete bones and edit objects containing bones. When you re ready to animate an armature all you need to do is add frames to the pose layer and reposition the armature on the Stage to create a keyframe. Keyframes in pose layers are called poses. To insert a frame in a pose layer right-click Win or Optionclick Mac a frame in a pose layer to the right of any existing frames and then click Insert Frame. To add a pose to a frame right-click Win or Option-click Mac the frame in the pose layer and then click Insert Pose. After you insert a pose you can use the Selection tool to change the configuration of the armature. If you want to change the length of the animation drag the last frame of the pose layer to the right or left in the Timeline to add or remove frames. You can adjust the speed of an .