[SceneKit专题]16-Actions动做

说明

本系列文章是对<3D Apple Games by Tutorials>一书的学习记录和体会

此书对应的代码地址

SceneKit系列文章目录

动做能够让你操做节点的位置,缩放,旋转和透明度.好比左滑,场景中的小猪向左转并跳一步. 基本分类有四种:Move(移动), Scale(缩放), Rotate(旋转)和Fade(透明渐变).还有两种特殊的动做:Sequence(序列,即顺序执行)和Group(组,即同时执行).

注意,关于物理形体physics body

当须要物理引擎来控制节点的移动和旋转时,应设置为dynamic.若是不须要移动,但仍能参与物理模拟,应设置为static.若是你既想控制某些节点的移动和旋转,同时仍能参与物理模拟,应设置为kinematic.

Move actions移动动做

• Move Action:在当前位置上移动一段
• MoveTo Action:移动到指定位置,与当前位置无关

  

Scale actions缩放动做

• Scale Action: 在当前缩放基础上缩放.
• ScaleTo Action:缩放到指定比例,与当前比例无关

  

Rotate actions旋转动做

• Rotate Action:在当前旋转基础上再旋转
• RotateTo Action:旋转到指定角度,与当前旋转无关
• RotateTo Action (Shortest):旋转到指定角度,走最短路径
• RotateBy Axis Angle Action:绕某个轴旋转
• RotateTo Axis Angle Action:绕某个轴旋转到指定角度

  

Fade actions褪色动做

• FadeOut Action:淡出,从当前透明度渐渐变彻底透明
• FadeIn Action:淡入,从当前透明度渐渐显示出来,彻底不透明
• FadeOpacityTo Action:改变不透明度到指定值

  

Sequenced and grouped actions序列和组动做

序列和组都是一系列动做的组合,能够让动做更复杂

• Actions:左侧的每个都是一个动做,上跳,下落,右移,右转
• Sequence:蓝色区域内就是序列,上跳动做执行1秒完成后,执行下落动做,按顺序
• Group:红色区域就是组,将会并发同时执行

  

Linear线性,Ease-In渐入,Ease-Out渐出,East-In-Out渐入渐出

The action editor动做编辑器

• Expand/Collapse Action Editor:展开/收缩动做编辑器
• Timeline:时间线
• Time Cursor:时间游标
• Time Zoom:时间缩放
• Drag&Drop Actions:拖放动做

动做建立

拖放一个旋转动做到节点,设置开始时间和持续时长,指定为绕z轴旋转

右击选中Create Loop,建立循环

选中∞无限循环,当它变蓝时就行了. 不要点X,那会取消

拖动游标预览效果

代码添加动做

// 1.时长
let duration = 0.2
// 2.上下移动动做
let bounceUpAction = SCNAction.moveByX(0, y: 1.0, z: 0, duration:
duration * 0.5)
let bounceDownAction = SCNAction.moveByX(0, y: -1.0, z: 0, duration:
duration * 0.5)
// 3.时间模式
bounceUpAction.timingMode = .EaseOut
bounceDownAction.timingMode = .EaseIn
// 4.动做序列
let bounceAction = SCNAction.sequence([bounceUpAction, bounceDownAction])
// 5.四周移动动做
let moveLeftAction = SCNAction.moveByX(-1.0, y: 0, z: 0, duration:
duration)
let moveRightAction = SCNAction.moveByX(1.0, y: 0, z: 0, duration:
duration)
let moveForwardAction = SCNAction.moveByX(0, y: 0, z: -1.0, duration:
duration)
let moveBackwardAction = SCNAction.moveByX(0, y: 0, z: 1.0, duration:
duration)
// 6.旋转动做
let turnLeftAction = SCNAction.rotateToX(0, y: convertToRadians(-90), z:0, duration: duration, shortestUnitArc: true)
let turnRightAction = SCNAction.rotateToX(0, y: convertToRadians(90), z:
0, duration: duration, shortestUnitArc: true)
let turnForwardAction = SCNAction.rotateToX(0, y: convertToRadians(180),
z: 0, duration: duration, shortestUnitArc: true)
let turnBackwardAction = SCNAction.rotateToX(0, y: convertToRadians(0),
z: 0, duration: duration, shortestUnitArc: true)
// 7.动做组
jumpLeftAction = SCNAction.group([turnLeftAction, bounceAction,
moveLeftAction])
jumpRightAction = SCNAction.group([turnRightAction, bounceAction,
moveRightAction])
jumpForwardAction = SCNAction.group([turnForwardAction, bounceAction,
moveForwardAction])
jumpBackwardAction = SCNAction.group([turnBackwardAction, bounceAction,
moveBackwardAction])
复制代码