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我在WPF中有一個3D透明對象。用於創建對象的畫筆的不透明度值已設置爲0.25。 我必須使用鼠標移動來旋轉關於其中心點的3D對象。 目前,物體的旋轉方向與鼠標移動方向相反。 有沒有人有關於如何在3D空間中旋轉透明對象的想法?WPF中的3D對象旋轉
用於旋轉的代碼是:
public static void DoMouseMoveEvent(object sender, MouseEventArgs e, Transform3DGroup transform3DGroup, System.Windows.Controls.Viewport3D viewport3D, ref Point mLastPos, Point3D centerPoint)
{
var pos = Mouse.GetPosition(viewport3D);
var actualPos = new Point(pos.X - viewport3D.ActualWidth/2,
viewport3D.ActualHeight/2 - pos.Y);
double dx = actualPos.X - mLastPos.X;
double dy = actualPos.Y - mLastPos.Y;
double mouseAngle = 0;
if (dx != 0 && dy != 0)
{
mouseAngle = Math.Asin(Math.Abs(dy)/
Math.Sqrt(Math.Pow(dx, 2) + Math.Pow(dy, 2)));
if (dx < 0 && dy > 0) mouseAngle += Math.PI/2;
else if (dx < 0 && dy < 0) mouseAngle += Math.PI;
else if (dx > 0 && dy < 0) mouseAngle += Math.PI * 1.5;
}
else if (dx == 0 && dy != 0)
{
mouseAngle = Math.Sign(dy) > 0 ? Math.PI/2 : Math.PI * 1.5;
}
else if (dx != 0 && dy == 0)
{
mouseAngle = Math.Sign(dx) > 0 ? 0 : Math.PI;
}
double axisAngle = mouseAngle + Math.PI/2;
var axis = new Vector3D(Math.Cos(axisAngle) * 4, Math.Sin(axisAngle) * 4, 0);
//axis.Normalize();
double rotation = 0.02 * Math.Sqrt(Math.Pow(dx, 2) + Math.Pow(dy, 2));
var r = new QuaternionRotation3D(new Quaternion(axis, rotation * 180/Math.PI));
var rotateTransform = new RotateTransform3D(r, centerPoint);
transform3DGroup.Children.Add(rotateTransform);
mLastPos = actualPos;
}
可否不正確的行爲的原因是該z座標未被捕獲用於上述代碼段計算的旋轉?
感謝您的幫助....