visual-studio-2010 - 如何在 XNA 上移动 3D 模型？

Question

我想控制我的 3D 模型，向各个方向移动它，但我不知道怎么做。有人知道吗？

Answer 1

您只需提供模型的世界变换效果。

 Matrix World = Matrix.CreateWorld(position, forward, up);

在您的更新方法中，您可以修改位置：

  LastPosition = Position;  

  if (IsKeyDonw(Left)  Position -= Vector3.UnitX * Speed * ElapsedTime; ForwardDirty = true;     
  if (IsKeyDonw(Right)  Position += Vector3.UnitX * Speed * ElapsedTime; ForwardDirty = true;     
  if (IsKeyDonw(Up)  Position -= Vector3.UnitZ * Speed * ElapsedTime;  ForwardDirty = true;     
  if (IsKeyDonw(Down)  Position += Vector3.UnitZ * Speed * ElapsedTime; ForwardDirty = true;     


// the forward is the direction where will point your model.

if (ForwardDirty) {
     Forward = Position - LastPosition;
     Forward.Normalize();
     ForwardDirty = false;
}

您还可以将运动基于前向矢量，或平滑角度变化，将最终前向与当前进行插值，...