something wrong with meshes

From: Jason (
Date: 10/07/04

Date: Thu, 7 Oct 2004 12:14:06 -0700

I'm having a little problem with mesh rendering, it looks almost like stuff
is rendered in backwards order. cullmode seems to have the correct effect,
but still some things appear ontop of other things they should not be. In
the mesh I am using I have a billboard, there are polls along the back that
should be bhind everything, yet they appear ontop of the billboard... but
behind a litte platform in front of the billboard. when the object is
rotated its the same order, platform, poles, billboard last.

I pulled out all the device creation rendering code to put it into one place
thinking it might be something else rendering changing the state a messing
it up but I get the same results. Maybe someone can spot what I am doing

Its c# code, I made a button in a default project, added a button and below
is the button response function... I think you juat need an .x and to add
the direct references to the project.




private void button1_Click(object sender, System.EventArgs e)


System.Windows.Media3D.RenderManager rm =

//create device

Device device;

// Set our presentation parameters

PresentParameters presentParams = new PresentParameters();

presentParams.Windowed = true;

presentParams.SwapEffect = SwapEffect.Discard;

presentParams.AutoDepthStencilFormat = DepthFormat.D16;

presentParams.EnableAutoDepthStencil = true;

presentParams.PresentFlag = Microsoft.DirectX.Direct3D.PresentFlag.None;

/*//no change

presentParams.Windowed = true;

presentParams.BackBufferCount = 0;

presentParams.MultiSample = MultiSampleType.None;

presentParams.MultiSampleQuality = 0;

presentParams.SwapEffect = SwapEffect.Discard;

presentParams.EnableAutoDepthStencil = true;

presentParams.AutoDepthStencilFormat = DepthFormat.D16;

presentParams.PresentFlag = PresentFlag.None;

presentParams.BackBufferWidth = this.Width;

presentParams.BackBufferHeight = this.Height;

presentParams.BackBufferFormat = Format.R5G6B5;

presentParams.FullScreenRefreshRateInHz = 0;

presentParams.PresentationInterval = PresentInterval.Immediate;

presentParams.DeviceWindow = this;


// store our default adapter

int adapterOrdinal =

// get our device capabilities so we can check

Caps caps = Manager.GetDeviceCaps(adapterOrdinal, DeviceType.Hardware);

CreateFlags createFlags;

if (caps.DeviceCaps.SupportsHardwareTransformAndLight)


createFlags = CreateFlags.HardwareVertexProcessing;




createFlags = CreateFlags.SoftwareVertexProcessing;


if (caps.DeviceCaps.SupportsPureDevice)


createFlags |= CreateFlags.PureDevice;


device = new Device(adapterOrdinal, DeviceType.Hardware,


createFlags, // CreateFlags.SoftwareVertexProcessing,



//some default states

device.RenderState.CullMode = Cull.CounterClockwise;

device.RenderState.ZBufferEnable = true;

device.RenderState.ColorVertex = true;

device.RenderState.EmissiveMaterialSource = ColorSource.Material;

device.RenderState.ShadeMode = ShadeMode.Gouraud;

device.RenderState.AmbientMaterialSource = ColorSource.Material;

device.RenderState.AlphaFunction = Compare.GreaterEqual;

device.RenderState.AlphaTestEnable = true;

device.RenderState.ReferenceAlpha = 8;

device.RenderState.SourceBlend =

device.RenderState.AlphaBlendEnable = true;

device.RenderState.DestinationBlend =

device.SamplerState[0].MinFilter = TextureFilter.Linear;

device.SamplerState[0].MagFilter = TextureFilter.Linear;

device.SamplerState[0].MipFilter = TextureFilter.Linear;

device.RenderState.Lighting = true;

device.RenderState.SpecularEnable = true;

device.RenderState.Ambient = Color.Black;


//load the mesh

Mesh m = Mesh.FromFile("BillBoard.X", MeshFlags.SystemMemory, device);

//setup camera

device.Transform.Projection = Matrix.PerspectiveFovLH(





device.Transform.View = Microsoft.DirectX.Matrix.LookAtLH( new Vector3(
0,50,-700), new Vector3( 0,0,0), new Vector3( 0,1,0) );

device.Transform.World = Matrix.Identity;

//default material

Material mat = new Material();

mat.Diffuse = Color.Blue;

mat.Ambient = Color.Red;

device.Material = mat;


Viewport vp = new Viewport();

vp.X = 0;

vp.Y = 0;

vp.Width = this.Width;

vp.Height = this.Height;

device.Viewport = vp;

//default lights

device.Lights[0].Diffuse = Color.White;

device.Lights[0].Type = LightType.Directional;

device.Lights[0].Direction = new Vector3(0,0,1);


device.Lights[0].Enabled = true;


device.Clear(ClearFlags.Target | ClearFlags.ZBuffer, Color.White, 1.0F, 0);







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