zhangwc

Q：如何显示2d的sprite？一种呈现在场景中（如粒子），一种固定在屏幕上不动(如GUI/HUD)
A：不同点在于是否需要设置useScreenCoordinates为true。

Q：如何按一定规则贴上纹理？
A：常用	texture.wrapS = texture.wrapT = THREE.RepeatWrapping;
        texture.repeat.set( 10, 10 );
        var material = new THREE.MeshBasicMaterial( { map: texture, side: THREE.DoubleSide } );

zhangwc

// 后台进程（优先级最低）
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_BACKGROUND, 0), ^{
});

// 更新界面（优先级最高）
dispatch_async(dispatch_get_main_queue(), ^{
});

zhangwc

scene = new THREE.Scene();
scene.fog = new THREE.FogExp2( 0xcccccc, 0.002 );

zhangwc

document.addEventListener("onmyevent", function(event){
    alert(event.eventType);
}, false);

var obj = document.getElementById("obj");

var event = document.createEvent('HTMLEvents');
event.initEvent("onmyevent", true, true);
event.eventType = 'message';
document.dispatchEvent(event);

zhangwc

renderer.domElement.addEventListener( 'mousedown', handleMouseDown, false );


function handleMouseDown(event) {

  event.preventDefault();

  var mouseX =((event.clientX - container.offsetLeft )/ container.clientWidth )*2-1;
  var mouseY =-((event.clientY - container.offsetTop )/ container.clientHeight )*2+1;
  

zhangwc

D = d*W/w;
d = (w/2)/tan(fov/2);
===>
D = (W/2)/tan(fov/2);

(D: the distance between camera and 3d-objects
d: the distance between camera and screen
W: 3d-objects size
w: screen size)

zhangwc

{
	var texture = new THREE.ImageUtils.loadTexture( 'images/img.jpg' );
	texture.needsUpdate = true;

	var material = new THREE.SpriteMaterial({ 
		map: texture, 
		useScreenCoordinates: false,
	 	alignment: THREE.SpriteAlignment.center,
	 	transparent: true
	});

zhangwc

UIColor *textDefaultColor = [UIColor blackColor]; 
CGColorRef textDefaultColorRef = textDefaultColor.CGColor; 
NSString *textDefaultColorStr = [CIColor colorWithCGColor:textDefaultColorRef].stringRepresentation;   
NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults]; 
[userDefaults setObject:textDefaultColorStr forKey:@"textColorKey"];

zhangwc

aBook = [[Book alloc] initWithBookNO:@"NO.21342413" bookName:@"清朝秘史" author:@"张家州" price:25.50];
[aBook addObserver:self forKeyPath:@"price" options:NSKeyValueObservingOptionOld|NSKeyValueObservingOptionNew context:nil];

// 观察到变化（收到来自被观察者的消息通知）
- (void)observeValueForKeyPath:(NSString *)keyPath
                      ofObject:(id)object
                        change:(NSDictionary *)change
                       context:(void *)context
{
    if([keyPath isEqual:@"price"]) {

zhangwc

options (如NSKeyValueObservingOptionOld|NSKeyValueObservingOptionNew）与infos的NSDictionary匹配使用 [infos objectForKey:@"old"], [infos objectForKey:@"new"]