hi all,I am a chinese student, and a beginner of the game program. I want to know how can i render the objects accordding to the depth of objects. It means render the object(depth:0.5f)first,and then render the object(depth:10.0f). the code is here: stD3DVertex objData1[] = { {-0.3f, -0.4f, 0, D3DCOLOR_XRGB(255,255,255), 0, 1}, {0.3f, -0.4f, 0, D3DCOLOR_XRGB(255,255,255), 1, 1}, {0.3f, 0.4f, 0, D3DCOLOR_XRGB(255,255,255), 1, 0}, {0.3f, 0.4f, 0, D3DCOLOR_XRGB(255,255,255), 1, 0}, {-0.3f, 0.4f, 0, D3DCOLOR_XRGB(255,255,255), 0, 0}, {-0.3f, -0.4f, 0, D3DCOLOR_XRGB(255,255,255), 0, 1} }; stD3DVertex objData2[] = { {-0.3f, -0.4f,0.3f, D3DCOLOR_XRGB(255,255,255), 0, 1}, {0.3f, -0.4f, 0.3f, D3DCOLOR_XRGB(255,255,255), 1, 1}, {0.3f, 0.4f, 0.3f, D3DCOLOR_XRGB(255,255,255), 1, 0}, {0.3f, 0.4f, 0.3f, D3DCOLOR_XRGB(255,255,255), 1, 0}, {-0.3f, 0.4f, 0.3f, D3DCOLOR_XRGB(255,255,255), 0, 0}, {-0.3f, -0.4f, 0.3f, D3DCOLOR_XRGB(255,255,255), 0, 1} }; void RenderScene() { // Clear the backbuffer. g_D3DDevice->Clear(0, NULL, D3DCLEAR_TARGET, D3DCOLOR_XRGB(0,0,0), 1.0f, 0); // Begin the scene. Start rendering. g_D3DDevice->BeginScene(); D3DXMatrixRotationY(&g_rotation2,g_angle); // Build the world matrix and update angle. g_worldMatrix =g_rotation2; g_angle += 0.01f; if(g_angle >= 360) g_angle = 0.0f; // Set the world matrix. //g_D3DDevice->SetTransform(D3DTS_WORLD, &g_worldMatrix); // Apply the view (camera). g_D3DDevice->SetTransform(D3DTS_VIEW, &g_ViewMatrix); g_D3DDevice->SetTexture(0, g_Texture); g_D3DDevice->SetStreamSource(0, g_VertexBuffer2, 0, sizeof(stD3DVertex)); g_D3DDevice->SetFVF(D3DFVF_VERTEX); g_D3DDevice->DrawPrimitive(D3DPT_TRIANGLELIST, 0, 2); // Draw square. g_D3DDevice->SetTexture(0, g_Texture); g_D3DDevice->SetStreamSource(0, g_VertexBuffer1, 0, sizeof(stD3DVertex)); g_D3DDevice->SetFVF(D3DFVF_VERTEX); g_D3DDevice->DrawPrimitive(D3DPT_TRIANGLELIST, 0, 2); // End the scene. Stop rendering. g_D3DDevice->EndScene(); // Display the scene. g_D3DDevice->Present(NULL, NULL, NULL, NULL); } thanks for telling me。appreciate it。