Hello, people. I have a problem with Z-Buffering in Direct3D 8 (duh). I have two polygons, one red and the other green. I have a rotation matrix that rotates the polygons around the x-axis. However, when the polygons rotate, the red polygon always appears! I''ve tried a lot of things, including switching to w-buffering and setting the testing mode of the z-buffer, and I know that the z-buffer is created successfully because when switching the mode of the z-buffer to D3DCMP_GREATER the green triangle always appears instead. If it helps you out, I have disabled culling. Here is my triangle init code:

	COLORED_VERTEX temp_tri[6];
	void *data;

	// set the triangles up
	temp_tri[0].x=0.5f;
	temp_tri[0].y=0.0f;
	temp_tri[0].z=-.433f;
	temp_tri[0].color=D3DCOLOR_XRGB(255,255,255);

	temp_tri[1].x=-0.5f;
	temp_tri[1].y=0.0f;
	temp_tri[1].z=-.433f;
	temp_tri[1].color=D3DCOLOR_XRGB(0,0,255);

	temp_tri[2].x=0.0f;
	temp_tri[2].y=0.0f;
	temp_tri[2].z=.433f;
	temp_tri[2].color=D3DCOLOR_XRGB(0,255,0);

	temp_tri[3].x=-0.5f;
	temp_tri[3].y=0.0f;
	temp_tri[3].z=-.433f;
	temp_tri[3].color=D3DCOLOR_XRGB(0,0,255);

	temp_tri[4].x=0.0f;
	temp_tri[4].y=0.0f;
	temp_tri[4].z=.433f;
	temp_tri[4].color=D3DCOLOR_XRGB(0,255,0);

	temp_tri[5].x=0.0f;
	temp_tri[5].y=-0.433f;
	temp_tri[5].z=0.0f;
	temp_tri[5].color=D3DCOLOR_XRGB(255,0,0);


	// now create the vertex buffer
	if(FAILED(d3d_device->CreateVertexBuffer(6*sizeof(COLORED_VERTEX),0,COLORED_VERTICES,D3DPOOL_DEFAULT,&temp_vertex_buffer)))
		return(0);

	// now fill the vertex buffer
	if(FAILED(temp_vertex_buffer->Lock(0,0,(BYTE**)&data,D3DLOCK_DISCARD)))
		return(0);
	memcpy(data,temp_tri,6*sizeof(COLORED_VERTEX));
	if(FAILED(temp_vertex_buffer->Unlock()))
		return(0);
 

Here is my rotation code:

	// zero out the world transform
	D3DMATRIX translate, rotate;
	SetToIdentityMatrix(&world_transform);
	SetToIdentityMatrix(&translate);
	SetToIdentityMatrix(&rotate);

	// set the rotate axis thing
	rotate._22=rotate._33=(float)cos(DEGREE_TO_RADIAN(x));
	rotate._23=(float)sin(DEGREE_TO_RADIAN(x));
	rotate._32=-rotate._23;

	// set the transform
	translate._43=2.0f;

	// now set the world transform
	MultiplyMatrices(&rotate,&translate,&world_transform);
	d3d_device->SetTransform(D3DTS_WORLD,&world_transform);
 

And finally, here is the rendering code:

	// clear the surfaces
	d3d_device->Clear(0,NULL,D3DCLEAR_ZBUFFER | D3DCLEAR_TARGET,D3DCOLOR_XRGB(0,0,0),1.0f,0);

	// begin the scene!
	d3d_device->BeginScene();

	d3d_device->SetRenderState(D3DRS_LIGHTING,FALSE);
	d3d_device->SetRenderState(D3DRS_ZENABLE,D3DZB_TRUE);
	d3d_device->SetRenderState(D3DRS_CULLMODE,D3DCULL_NONE);
	d3d_device->SetStreamSource(0,temp_vertex_buffer,sizeof(COLORED_VERTEX));
	d3d_device->SetVertexShader(COLORED_VERTICES);
	d3d_device->DrawPrimitive(D3DPT_TRIANGLELIST,0,2);

	// end the scene
	d3d_device->EndScene();

	// now flip the primary surface and the backbuffer
	d3d_device->Present(NULL,NULL,NULL,NULL);
 

Please help me as soon as possible! Thank you in advance.

Come on, there must have been SOMEONE to encounter this error!