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标题: away3D 碰撞问题 [打印本页]

作者: yeu1233 时间: 2012-9-12 15:31
标题: away3D 碰撞问题
这个是限制相机的移动范围。

下图为相机的移动的限制图。红色部分为可移动范围。

属性：
  [Embed(source="dd.jpg")]

  private var CollisionBitmap:Class;

  private var collisionBitmap:BitmapData;

  private var sampleBitmap:BitmapData;

  private var sampleRect:Rectangle = new Rectangle();

  private var samplePoint

oint = new Point();

  private var collisionRect:Rectangle;

  private var cameraX:Number;

  private var cameraY:Number;

  private var collisionShape:Shape = new Shape();

  private var collisionVector

oint = new Point();

  private var collisionMatrix:Matrix = new Matrix();

  private var collisionDot:Number;

  private var collisionDistance:Number = 30;

  读取图片
  private function initCollisionBitmap():void

  {

collisionBitmap = Cast.bitmap(CollisionBitmap);

sampleBitmap = new BitmapData(collisionDistance*2, collisionDistance*2, false, 0);



sampleRect = new Rectangle(0, 0, collisionDistance*2, collisionDistance*2);

  }

检测方法
private function checkCollisionData():void

  {

//get camera position on collision map

cameraX = 350 - camera.x*1.87;

cameraY = 510 + camera.z*1.87;

//determine position of sample data

sampleRect.x = int(cameraX - collisionDistance);

sampleRect.y = int(cameraY - collisionDistance);

//check for collision

var i:int = collisionDistance + 1;

do {

i--;

collisionRect = sampleBitmap.getColorBoundsRect(0xFFFFFF, 0x000000);

collisionShape.graphics.clear();

collisionShape.graphics.beginFill(0x660000);

collisionShape.graphics.drawCircle(collisionDistance, collisionDistance, i);

collisionShape.graphics.endFill();

sampleBitmap.copyPixels(collisionBitmap, sampleRect, samplePoint);

sampleBitmap.draw(collisionShape, null, null, BlendMode.MULTIPLY);

} while (sampleBitmap.getColorBoundsRect(0xFFFFFF, 0x000000).width && i > 1)

//resolve collision

if (i < collisionDistance) {

//calculate collision normal

collisionVector.x = collisionRect.x + collisionRect.width/2 - collisionDistance;

collisionVector.y = collisionRect.y + collisionRect.height/2 - collisionDistance;

collisionVector.normalize(1);

//update camera position on collision map

cameraX -= collisionVector.x*(collisionDistance - i);

cameraY -= collisionVector.y*(collisionDistance - i);

//updata camrea position

camera.x = (350 - cameraX)/1.87;

camera.z = (cameraY - 510)/1.87;

//determin collision vector in camera-space

collisionMatrix.identity();

collisionMatrix.rotate(panangle * toRADIANS);

collisionVector.x = -collisionVector.x;

collisionVector = collisionMatrix.deltaTransformPoint(collisionVector);

//update camera speed

collisionDot = cameraRightSpeed*collisionVector.x + cameraForwardSpeed*collisionVector.y;

cameraRightSpeed -= collisionDot*collisionVector.x;

cameraForwardSpeed -= collisionDot*collisionVector.y;

//re-check collision data

checkCollisionData();

}

  }

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