Hello all, I'm trying a very simple/quick/dirty Managed DirectX 9 (ancient and obsolete, I know) WinForm program on my Win 7 64-bit box just to see if it would run. I'm just clearing the screen to DarkBlue and manually drawing a triangle in screen coordinates. By compiling to "x86" rather than "Any CPU" everything runs...I see the blue client area of the winform but I don't see the triangle. It's been years since I've done any graphics stuff so I don't know if it's my code that's wrong or whether it's some problem running a 32-bit MDX app on 64-bit Windows. Here's what I've got: In "Program.cs": namespace TriangleForm { static class Program { /// <summary> /// The main entry point for the application. /// </summary> [STAThread] static void Main() { Application.EnableVisualstyles(); Application.SetCompatibleTextRenderingDefault(false); Form1 frm = new Form1(); frm.InitializeGraphics(); Application.Run(frm); } } } in "Form1.cs ": namespace TriangleForm { public partial class Form1 : Form { private Device device = null; public Form1() { InitializeComponent(); } public void InitializeGraphics() { PresentParameters presentParams = new PresentParameters(); presentParams.Windowed = true; presentParams.SwapEffect = SwapEffect.Discard; device = new Device(0, DeviceType.Hardware, this, CreateFlags.HardwareVertexProcessing, presentParams); } private void Form1_Paint(object sender, PaintEventArgs e) { device.Clear(ClearFlags.Target, System.Drawing.Color.DarkBlue, 1.0f, 0); device.Present(); CustomVertex.TransformedColored[] verts = new CustomVertex.TransformedColored[3]; verts[0].X = 600.0f; verts[0].Y = 50.0f; verts[0].Color = System.Drawing.Color.Red.ToArgb(); verts[1].X = 300.0f; verts[1].Y = 500.0f; verts[1].Color = System.Drawing.Color.Black.ToArgb(); verts[2].X = 800.0f; verts[2].Y = 500.0f; verts[2].Color = System.Drawing.Color.Purple.ToArgb(); device.BeginScene(); device.VertexFormat = CustomVertex.TransformedColored.Format; device.DrawUserPrimitives(PrimitiveType.TriangleList, 1, verts); device.EndScene(); } } } Anybody see why the triangle should be invisible? Thanks in advance! -L

Hello Mike,

I've moved the "device.Present()" to the end of the OnPaint handler i.e. the next line after "device.EndScene() as in

.
.
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device.BeginScene();
device.VertexFormat = CustomVertex.TransformedColored.Format;
device.DrawUserPrimitives(PrimitiveType.TriangleList, 1, verts);
device.EndScene();
device.Present();


but the triangle still doesn't show up on screen. Anything else you can think of? It should at least appear once shouldn't it?

But I'm using "Transformed" vertices....the Z and W components should be ignored if they are already transformed to screen coordinates, shouldn't they? If not, what are appropriate values to quickly plug-in for Z and W. Basically, I just need to see the triangle on the screen before moving any further.

z = 0.5, w = 1 should be fine. You need at least w = 1 because the pipeline divides by w to get the actual screen coords.

Okay, now I have the following:

device.Clear(ClearFlags.Target, System.Drawing.Color.DarkBlue, 1.0f, 0);

CustomVertex.TransformedColored[] verts = new CustomVertex.TransformedColored[3];

verts[0].X = 600.0f;
verts[0].Y = 50.0f;
verts[0].Z = 0.5f;
verts[0].Rhw = 1.0f;
verts[0].Color = System.Drawing.Color.Red.ToArgb();

verts[1].X = 300.0f;
verts[1].Y = 500.0f;
verts[1].Z = 0.5f;
verts[1].Rhw = 1.0f;
verts[1].Color = System.Drawing.Color.Black.ToArgb();

verts[2].X = 800.0f;
verts[2].Y = 500.0f;
verts[2].Z = 0.5f;
verts[2].Rhw = 1.0f;
verts[2].Color = System.Drawing.Color.Purple.ToArgb();


device.BeginScene();
device.VertexFormat = CustomVertex.TransformedColored.Format;
device.DrawUserPrimitives(PrimitiveType.TriangleList, 1, verts);
device.EndScene();
device.Present();

But still no triangle? Yeesh...

Hi,

I'm using DirectX Managed + Windows 7 RC 64bit and everything is working fine for me. No problems so far...

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Your triangle is probably getting culled; change the renderstate CullMode to Cull.None.