obb碰撞检测

Cocos2d-x
#1

如果有两个矩形图片，如何利用OBB包围盒对图形进行包围。

#2

看着就好心塞，都没人回答我，哎。
pt1 = m_Sprite2->convertToWorldSpace(ccp(0, 0));
pt2 = m_Sprite2->convertToWorldSpace(ccp(64, 0));
pt3 = m_Sprite2->convertToWorldSpace(ccp(64, 64));
pt4 = m_Sprite2->convertToWorldSpace(ccp(0, 64));

obb2._center = Vec3(m_Sprite2->getPosition().x, m_Sprite2->getPosition().y, 0);
obb2._xAxis = Vec3(pt2.x - pt1.x, pt2.y - pt1.y, 0);
obb2._yAxis = Vec3(pt4.x - pt1.x, pt4.y - pt1.y, 0);
obb2._zAxis = Vec3(0, 0, 1);
obb2._extents = Vec3(0.5, 0.5, 1);

if (obb1.intersects(obb2))
{
MessageBox(“碰撞”, “”);
}

对于2d图形利用OBB碰撞检测，注意Z轴不能设为0.

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#3

obb对象怎么创建的？