错误XNA Framework VertexBuffer IndexBuffer使用情况
本文关键字:用情 情况 IndexBuffer VertexBuffer XNA Framework 错误 | 更新日期: 2023-09-27 17:59:54
我在完成XNA 4.0的一本书后正在创建一个游戏。它将是3D的,但我已经陷入了创建地形的困境。。。
更新:从这里开始的一切都是更新。。。地形更新:
public void Update(Matrix view, Matrix projection)
{
View = view;
Projection = projection;
World = Matrix.CreateTranslation(-Width / 2f, 0, Height / 2f);
}
地形绘制:
public void Draw(GraphicsDevice g)
{
effect.CurrentTechnique = effect.Techniques["ColoredNoShading"];
effect.Parameters["xView"].SetValue(View);
effect.Parameters["xProjection"].SetValue(Projection);
effect.Parameters["xWorld"].SetValue(World);
foreach (EffectPass pass in effect.CurrentTechnique.Passes)
{
pass.Apply();
//g.DrawUserIndexedPrimitives(PrimitiveType.TriangleList, vertices, 0, vertices.Length, indices, 0, indices.Length / 3, VertexPositionColorNormal.VertexDeclaration);
g.DrawIndexedPrimitives(PrimitiveType.TriangleList, 0, 0, vertices.Length, 0, indices.Length / 3);
}
}
评论行正在工作,在这两种情况下,我都能看到地形。。。以下代码用于初始化顶点和索引缓冲区:
private void SetUpVertices(GraphicsDevice g)
{
float currentH;
int currentI;
vertices = new VertexPositionColorNormal[Width * Height];
for (int x = 0; x < Width; x++)
{
for (int y = 0; y < Height; y++)
{
currentH = heightData[x,y];
currentI = x + y * Width;
vertices[currentI].Position = new Vector3(x, currentH , -y);
if (currentH < minH + (maxH - minH) / 3)
vertices[currentI].Color = Color.ForestGreen;
else if (currentH < maxH - (maxH - minH) / 3)
vertices[currentI].Color = Color.LawnGreen;
else
vertices[currentI].Color = Color.White;
}
}
SetUpIndices(g);
}
private void SetUpIndices(GraphicsDevice g)
{
indices = new int[(Width - 1) * (Height - 1) * 6];
int counter = 0;
for (int y = 0; y < Height - 1; y++)
{
for (int x = 0; x < Width - 1; x++)
{
int lowerLeft = x + y * Width;
int lowerRight = (x + 1) + y * Width;
int topLeft = x + (y + 1) * Width;
int topRight = (x + 1) + (y + 1) * Width;
indices[counter++] = topLeft;
indices[counter++] = lowerRight;
indices[counter++] = lowerLeft;
indices[counter++] = topLeft;
indices[counter++] = topRight;
indices[counter++] = lowerRight;
}
}
SetUpNormals(g);
}
private void SetUpNormals(GraphicsDevice g)
{
for (int i = 0; i < vertices.Length; i++)
{
vertices[i].Normal = Vector3.Zero;
}
int[] index = new int[3];
Vector3 s1, s2, n;
for (int i = 0; i < vertices.Length / 3; i++)
{
for (int y = 0; y < 3; y++)
index[y] = indices[i * 3 + y];
s1 = vertices[index[0]].Position - vertices[index[2]].Position;
s2 = vertices[index[0]].Position - vertices[index[1]].Position;
n = Vector3.Cross(s1, s2);
for (int y = 0; y < 3; y++)
{
vertices[index[y]].Normal += n;
vertices[index[y]].Normal.Normalize();
}
}
FillBuffers(g);
}
private void FillBuffers(GraphicsDevice g)
{
VertexBuffer = new VertexBuffer(g, VertexPositionColorNormal.VertexDeclaration, vertices.Length, BufferUsage.WriteOnly);
VertexBuffer.SetData(vertices);
IndexBuffer = new IndexBuffer(g, typeof(int), indices.Length, BufferUsage.WriteOnly);
IndexBuffer.SetData(indices);
g.Indices = IndexBuffer;
g.SetVertexBuffer(VertexBuffer);
}
我不认为这是一个错误,因为它正在与另一条线路合作。我使用的.fx文件可能有错误。如果你这么认为的话,我将切换到BasicEffects。。。(您可能会注意到,代码来自http://www.riemers.net/eng/Tutorials/XNA/Csharp/series1.php)
谢谢你的帮助。。。
您的,Florian
(问题原始修订版的答案。)
您没有在图形设备上设置顶点缓冲区和索引缓冲区。这两行代码(未经测试)应该可以满足您的需要:
g.GraphicsDevice.Indices = indexBuffer;
g.GraphicsDevice.SetVertexBuffer(vertexBuffer);
将它们放置在设置效果参数(ef
)之后,循环之前。
顶点缓冲区提供异常消息所要求的顶点声明。
问题更新后编辑:在新版本中,您正在设置顶点和索引缓冲区,但它位于错误的位置。您需要在每帧的图形设备上设置它们。只有在FillBuffers
中设置代码后,没有任何更改,代码才能工作。但我猜这些东西是在你的类的Draw
方法之外绘制的?
如果其他东西是SpriteBatch
,即使,它也可以使用顶点缓冲区和索引缓冲区。所以它会重置你的设置。(值得一提的是,它还设置了渲染状态-在这种情况下,您可能需要查看本文。)