6. Animate3DTest 动画的播放和切换 小乌龟的demo

(1) 同一个c3b既可以创建sprite也可以创建action
std::string fileName ="Sprite3DTest/tortoise.c3b";
auto sprite = Sprite3D::create(fileName);
sprite->setScale(0.1f);
auto s =Director::getInstance()->getWinSize();
sprite->setPosition(Vec2(s.width *4.f / 5.f,s.height /2.f));
addChild(sprite);
_sprite = sprite;
auto animation = Animation3D::create(fileName);

(2) animation 可以通过 时间来分拆，这个时间是在3Dmax中定义的
if (animation)
{ //2个动画的时间不同，这些在3Dmax中定义
auto animate = Animate3D::create(animation,0.f,1.933f);
_swim = RepeatForever::create(animate);
sprite->runAction(_swim);
_swim->retain();
_hurt = Animate3D::create(animation,1.933f,2.8f);
_hurt->retain();
_state = State::SWIMMING;
}

(3)乌龟游到尽头 调用 reachEndCallBack
通过reverse获得相反的action
auto inverse = (MoveTo*)_moveAction->reverse();
沿y轴180度转向
auto rot = RotateBy::create(1.f,Vec3(0.f,180.f,0.f));

(4)在onTouchesEnded中实现播放乌龟的 hurt动作 ，但是这里没法实现hurt动作的结束回调，所以采用_hurt->getDuration()
来获得其结束时间，并且做一个renewCallBack来回到_swim 动作
auto delay = DelayTime::create(_hurt->getDuration() - Animate3D::getTransitionTime());
auto seq = Sequence::create(delay,CallFunc::create(CC_CALLBACK_0(Animate3DTest::renewCallBack,this)),nullptr);

疑问? Animate3D::getTransitionTime() 用来干嘛

为啥会用void Animate3DTest::update(float dt) 来维护一个中间状态 HURT_TO_SWIMMING 和SWIMMING_TO_HURT

7. AttachmentTest 装武器

获取某个骨骼，Bip001 R Hand是在3Dmax定义的
auto sp = Sprite3D::create("Sprite3DTest/axe.c3b");
sprite->getAttachNode("Bip001 R Hand")->addChild(sp);

点击后去掉附加节点

_sprite->removeAllAttachNode();

8. Sprite3DReskinTest 皮肤换装,动态更换材质(mesh)

(1)字号字体
TTFConfig ttfConfig("fonts/arial.ttf",20);
auto label1 = Label::createWithTTF(ttfConfig,"Hair");

应该是在3dm中定义好了mesh的名称?
_girlPants[0]= "Girl_LowerBody01";
_girlPants[1]= "Girl_LowerBody02";
_girlUpperBody[0] = "Girl_UpperBody01";
_girlUpperBody[1] = "Girl_UpperBody02";
_girlShoes[0] = "Girl_Shoes01";
_girlShoes[1] = "Girl_Shoes02";
_girlHair[0]= "Girl_Hair01";
_girlHair[1]= "Girl_Hair02";

(2) 初始化的时候隐藏备选的部分,点击切换的时候再 交换显示
auto girlPants = sprite->getMeshByName(_girlPants[1]);
if(girlPants)
{
girlPants->setVisible(false);

}

9.Sprite3DWithOBBPerfromanceTest 包围盒与3D模型碰撞的实现

1. decltype 用来获取auto的type 并且作为声明非常适用

autoobbSize =_obb.size();

for(decltype(obbSize) i =0; i < obbSize; i++)

2. ray 来将触摸点转换到3d场景中，判断是否点击到。

Rayray;

calculateRayByLocationInView(&ray,location);

那么ray的射出方向会沿着camera的正中心发射吗？

3.画3d的边框
#include "DrawNode3D.h"
DrawNode3D* _drawDebug;
首先要画一个sprite的外框，比如得到他得obb


_drawDebug->clear();
Mat4 mat = _sprite->getNodeToWorldTransform();
mat.getRightVector(&_obbt._xAxis);
_obbt._xAxis.normalize();
mat.getUpVector(&_obbt._yAxis);
_obbt._yAxis.normalize();
mat.getForwardVector(&_obbt._zAxis);
_obbt._zAxis.normalize();
_obbt._center = _sprite->getPosition3D();
Vec3 corners[8] = {};
_obbt.getCorners(corners);


然后获得corners，调用drawCube()函数
_drawDebug->drawCube(corners,Color4F(0,1,1));


4. obb可以不依赖sprite独立得存在
void Sprite3DWithOBBPerfromanceTest::addNewOBBWithCoords(Vec2 p)
{
Vec3 extents = Vec3(10,10,10);
AABB aabb(-extents,extents);
auto obb = OBB(aabb);
obb._center = Vec3(p.x,p.y,0);
_obb.push_back(obb);
}


5. 对碰撞的判断其实只很简单的一句话
_obbt.intersects(_obb[i])

10.Sprite3DMirrorTest 3D模型的镜像

sprite->setScaleX(-5); 在素材上转换

sprite->setCullFace(GL_FRONT); 在mesh上转换

11. Camera3DTestDemo

Camera3DTest.cpp

camera 可以被添加到任何地方,如果一个sprite or layer想要被camera观察到，
必须要包含其flag(效果也会作用到其child)
auto sprite = Sprite::create("myFile.png");
sprite->setCameraMask(CameraFlag::USER1);
auto camera = Camera::createPerspective(60,winSize.width/winSize.height,1000);
camera->setCameraFlag(CameraFlag::USER1);
scene->addChild(camera);


(1) 缩放，在点击label的时候设置标志位_bZoomOut _bZoomIn

Vec3 lookDir = _camera->getPosition3D() - _sprite3D->getPosition3D();
Vec3 cameraPos = _camera->getPosition3D();
if(lookDir.length() <= 300)
{
cameraPos += lookDir.getNormalized();
_camera->setPosition3D(cameraPos);
}
重新设置camera的位置即可


(2) 左右旋转 实际上就是沿着y轴左右旋转
Vec3 rotation3D= _camera->getRotation3D();
rotation3D.y+= 1;
_camera->setRotation3D(rotation3D);


(3) 视角切换

_cameraType来记录当前camera类型
enum class CameraType
{
FreeCamera=0,
FirstCamera=1,
ThirdCamera=2,
};

[第一人称] 实际上就是把相机放在了 角色头上
Vec3 newFaceDir;
_sprite3D->getWorldToNodeTransform().getForwardVector(&newFaceDir);
newFaceDir.normalize();
_camera->setPosition3D(Vec3(0,35,0) + _sprite3D->getPosition3D());
_camera->lookAt(_sprite3D->getPosition3D() + newFaceDir*50,Vec3(0,0));

[第三人称]
_camera->setPosition3D(Vec3(0,130,130) + _sprite3D->getPosition3D());
_camera->lookAt(_sprite3D->getPosition3D(),0));

(4)让camera 随着角色移动

每一帧都需要更新camera的状态
void Camera3DTestDemo::updateCamera(float fDelta)
-> move3D(fDelta);

先计算出角色需要移动多少：

①得到朝向目标的单位向量
Vec3 newFaceDir = _targetPos - curPos;
newFaceDir.y = 0.0f;
newFaceDir.normalize();

② 获得实际移动向量
Vec3 offset = newFaceDir * 25.0f * elapsedTime;

③ camera随之移动即可
Vec3 cameraPos= _camera->getPosition3D();
cameraPos.x+=offset.x;
cameraPos.z+=offset.z;
_camera->setPosition3D(cameraPos);

常用总结：
1. 3d 纬度的朝向设置
sprite->setRotation3D(Vec3(0,180,0));

2. sprite->setEffect() 添加特效

3.sprite->getAttachNode("Bip001 R Hand") 获取某个骨骼

4. sprite->getMeshByName(_girlPants[1]); 获取材质

5. Vec2 getNormalized() const;

Vec3Vec3::getNormalized()const;

获取向量的标准化形式. 若为零向量,返回(0,0)
也可以理解为获取一个向量的单位向量

参考Cocos2d-x 3.3 的3D开发功能介绍 http://cn.cocos2d-x.org/tutorial/show?id=1582