Texture as a background and other vertex drawing: problem.

Hello,

I have a little problem in DirectX 9 (using CSharp). I need to put a background(texture) to my scene. Everything work fine, my bitmap appear without problems. Im using a Quad to draw my texture on.

The problem appear when I try to draw other primitive (triangle) in front of my Quad (background).

There is some code:

// The quad buffer.

vertexTexture = new VertexBuffer( typeof(CustomVertex.TransformedColoredTextured), 4, device, Usage.WriteOnly, CustomVertex.TransformedColoredTextured.Format, Pool.Default);

 

// Note: Im assigning my vertices correctly, I'll not post the code here.

device.BeginScene();

 

// There im trying to write some colored triangle.

for (int i = 0; i < LVRTSDisplay.SectorNumber;i++)

{

device.SetStreamSource( 0, vertexBuffer1, 0);

device.VertexFormat = CustomVertex.TransformedColored.Format;

device.DrawPrimitives(PrimitiveType.TriangleList, 0, (2 * LVRTSDisplay.ArcNumber));

}

 

device.SetStreamSource( 0, vertexTexture, 0);

device.VertexFormat = CustomVertex.TransformedColoredTextured.Format;

device.SetTexture(0, textureBackground);

device.DrawPrimitives(PrimitiveType.TriangleFan, 0, 2);

 

device.EndScene();

device.Present();

The first time that I render this, I can see my first drawed triangles and after I can see my background. But the second time I render it, it's like if my triangles are now drawed. It seem to be the result of:

device.SetTexture(0, textureBackground);

device.DrawPrimitives(PrimitiveType.TriangleFan, 0, 2);

If I switch my code and draw my background first, I'll never see my triangles.

I really dont know what,s the problem there.

Thank for your help/hints about this problem.

Salutations,

Rectification!

there his my illustrated problem:

Before:

After

After:

I'm no expert, not by a long shot:( But the line in your render code;

device.SetStreamSource( 0, vertexBuffer1, 0);

Why are you using an array subscript and not simply;

device.SetStreamSource( 0, vertexBuffer1, 0);

Hello!

Becose I have an array of VertexMatric(this array is in reallity the green spots on the image.)

Salutations,

just a thought, have you got the ZBuffer enabled?

device.RenderState.ZBufferEnable = true;

the zbuffer contains the flip screens pixels with a depth number ( z ) assigned to every pixel so as to draw layer apon layer while taking care of the problem of drawing with depth.