XNA初学者：如何将顶点数组合并到单个顶点缓冲区中

Question

我刚刚开始使用XNA，现在我面临初学者问题，性能问题。我绘制的对象具有自己的顶点缓冲区，所以当我有〜50k个对象时，fps显着下降（从60到5-12）。

我得到了我应该合并我顶点成块的小费，但我不知道该怎么做..

希望得到任何帮助，我可以用代码的例子得到。

编辑：这是我想出了与帮助来自布劳

var cubes = newChunk.Where(c => c != null && !badIndex.Contains(c.BlockType)); 
VertexPositionColorTextureNormal[] verts = new VertexPositionColorTextureNormal[cubes.Sum(c => c.Vertices.Count)]; 
int VertexOffset = 0; 
var inTheRightOrder = cubes; 
foreach (var cube in inTheRightOrder) 
{ 
    var cb = cube.Vertices.ToArray(); 
    for (int v = 0; v < cb.Length; v++) 
    { 
     verts[VertexOffset + v] = cb[v]; 
    } 

    VertexOffset += cb.Length; 
} 
VertexBuffer newVB = new VertexBuffer(device, VertexPositionColorTextureNormal.VertexDeclaration, verts.Length, BufferUsage.WriteOnly); 
newVB.SetData(verts); 
var ck = new Cube { Vertices = verts, BoundingBox = BoundingBox.CreateFromPoints(verts.Select(i => i.Position)), Buffer = newVB, Cubes = cubes.Count() }; 
Cubes.Add(ck); 

Answer 1

合并它们，你必须与此类似的代码。

int NumVerts = Objects.Sum(o => o.Vertex.Length); 
int NumIndexes = Objects.Sum(o => o.Index.Length); 

VertexPositionColor[] Vertex = new VertexPositionColor[NumVerts]; 
int[] Index = new int[NumIndexes]; 

int VertexOffset = 0; 
int IndexOffset = 0; 
foreach (Object object in Objects) 
{ 
    for (int v=0; v<object.Vertex.Length; v++) 
    { 
     Vertex[VertexOffset+v] = object.Vertex[v] + VertexOffset; 
    } 

    for (int i=0; i<object.Index.Length; i++) 
    { 
     Index[IndexOffset+i] = object.Index[i] + VertexOffset; 
    } 

    VertexOffset += object.Vertex.Length; 
    IdnexOffset += object.Index.Length; 
}