DirectX 9.0顶点缓冲区更新(DirectX 9.0 vertex buffer updating)
我使用DirectX 9.0制作了一个小型3D查看器应用程序。 现在我想添加一些编辑功能。 假设我想编辑一个大的多边形。 当用户编辑形状时，将添加，删除和移动顶点。 现在，每个多边形都存储为顶点缓冲区。 我的问题是，在用户编辑形状时存储和显示形状的最佳方法是什么？ 如果我每次发生变化时都会破坏并重新创建顶点缓冲区，我相信它会过于耗费资源并且不够理想。
我虽然我也应该在主帖上问我的问题，所以他们在这里：
我有三个不同的任务，其中两个我不知道如何实现：
1）编辑顶点：简单，我将用VB中的新位置更新旧顶点。
2）删除顶点：这里发生了什么？ 如何在不创建新VB的情况下删除它？ 我应该添加一个空白的VB吗？
3）添加顶点：这里怎么样？ 我可以更改动态VB的长度并在末尾添加顶点吗？我认为另一个想法会起作用：
1）编辑很容易
2）删除只意味着我将覆盖已删除的顶点，可能是前一个或下一个顶点的位置，因此它将不可见。
3）Addition将创建一个新的顶点缓冲区，但会像Vector或List一样调整大小。 每次重新创建它的大小都会是这样的
NewSize = OldSize * 1.1（增加10％）
所以连续添加不必重新创建VB。
所以1和2永远不会创建一个新的VB，3有时可能创建一个。 这听起来怎么样？I've made a small 3D viewer application using DirectX 9.0. Now I would like to add some editing functionality. Suppose that I want to edit a large polygon. While the user edits the shape, vertices would be added, deleted and moved. Right now each polygon is stored as a vertex buffer. My question is, what is the best way to store and display the shape while the user edits it? If i destroy and re-create the vertex buffer each time a change happens, I believe it will be too resource intensive and suboptimal.
I though I should ask my questions in the main post as well so here they are :
I have three different tasks, two of which I don't know how to implement :
1) Editing a vertex : Easy, I will just update the old vertex with the new position in the VB.
2) Deleting a vertex : What happens here? How do I remove it without creating a new VB? Should I just add a blank VB?
3) Adding a vertex : What about here? Can I change the length of a dynamic VB and add vertices at the end?Another thought here that I believe would work :
1) Editing is easy
2) Deleting would just mean that I will overwrite the deleted vertex with possibly the position of the previous or the next vertex, so it will not be visible.
3) Addition will create a new vertex buffer, but will resize like a Vector or a List. Each time it's re-created it's size would be something like
NewSize = OldSize * 1.1 (adding 10% more)
so that successive additions do not have to re-create the VB.
So 1 & 2 never create a new VB and 3 might sometimes create one. How does this sound?
原文：https://stackoverflow.com/questions/9537837
最满意答案
您可以从Binding派生一个类来预设ConverterCulture，并使用它来代替原始绑定，例如
Public Class Binding Inherits System.Windows.Data.Binding Public Sub New() MyBase.New() ConverterCulture = System.Globalization.CultureInfo.CurrentCulture End Sub Public Sub New(ByVal path As String) MyBase.New(path) ConverterCulture = System.Globalization.CultureInfo.CurrentCulture End Sub End Class和
<TextBlock Text="{my:Binding TimeTest, StringFormat=t}" />您也可以尝试自定义StringFormat，例如StringFormat ='HH：mm'
You can derive a class from Binding which presets the ConverterCulture, and use this instead of the original binding, like
Public Class Binding Inherits System.Windows.Data.Binding Public Sub New() MyBase.New() ConverterCulture = System.Globalization.CultureInfo.CurrentCulture End Sub Public Sub New(ByVal path As String) MyBase.New(path) ConverterCulture = System.Globalization.CultureInfo.CurrentCulture End Sub End Classand
<TextBlock Text="{my:Binding TimeTest, StringFormat=t}" />You might also try a custom StringFormat, like StringFormat='HH:mm'
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