Hello I found a demo on ati website. http://ati.amd.com/developer/samples/DepthExplosion.html This demo has introduced a way in which we can simulate a 3d explosion rather than 2d explosion(billboarding). this code is in c++. I tried to convert it to c# but i couldn't. Can you help me, please?

It's my converted code :

public partial class ExplosionForm : Form
{
private const float EXPLOSION_SIZE = 40.0f;
private const float Z_NEAR = 1.0f;
private const float Z_FAR = 100.0f;
private const float EYE_Z = 50.0f;

private Device _device;
private Color _backColor;
private Material _mat;

private VertexBuffer _vb;
private VertexDeclaration _vd;

private Texture _depthTexture;
private Texture _nois1Texture;
private Texture _nois2Texture;
private Texture[] _exploTexture;

CustomVertex.PositionTextured[] _billboard;

private VertexShader _vs;
private PixelShader _ps;
private HPTimer _timer;

public ExplosionForm()
{
InitializeComponent();

//OpenFileDialog dialog = new OpenFileDialog();
//dialog.CheckFileExists = true;
//if (dialog.ShowDialog() == DialogResult.Cancel) Application.Exit();

PresentParameters presentParameters = new PresentParameters();
presentParameters.SwapEffect = SwapEffect.Discard;
presentParameters.Windowed = true;

this.Height = 700;
this.Width = 1000;
this.StartPosition = FormStartPosition.CenterScreen;

this.Setstyle(Controlstyles.AllPaintingInWmPaint | Controlstyles.Opaque, true);

_device = new Device(0, DeviceType.Hardware, this, CreateFlags.SoftwareVertexProcessing
, presentParameters);

_backColor = Color.LightSkyBlue;

_device.RenderState.Lighting = true;
_device.RenderState.Ambient = Color.White;

Material material = new Material();
material.Ambient = Color.White;
_device.Material = material;

_device.Lights[0].Ambient = Color.White;
_device.Lights[0].Type = LightType.Directional;
_device.Lights[0].Direction = new Vector3(0, 0, 1);
_device.Lights[0].Enabled = true;
_device.Lights[0].Update();

_vb = new VertexBuffer(typeof(CustomVertex.PositionTextured), 4, _device, Usage.WriteOnly
, CustomVertex.PositionTextured.Format, Pool.Managed);
_vb.Created += new EventHandler(this.OnVertexBufferCreate);
OnVertexBufferCreate(_vb, null);


_depthTexture = TextureLoader.FromFile(_device, Application.StartupPath + @"\depth.tga");
_nois1Texture = TextureLoader.FromFile(_device, Application.StartupPath + @"\noise.tga");
_nois2Texture = TextureLoader.FromFile(_device, Application.StartupPath + @"\noise.tga");

_exploTexture = new Texture[30];
for (int i = 0; i < _exploTexture.Length; i++)
_exploTexture = TextureLoader.FromFile(_device, Application.StartupPath + @"\fireball" + i.ToString("00") + ".tga");

_device.Transform.Projection = Matrix.PerspectiveFovLH((float)Math.PI / 3, this.Width / this.Height, Z_NEAR, Z_FAR);

Matrix mat1 = _device.Transform.World * _device.Transform.View;
Matrix mat2 = Matrix.MultiplyTranspose(mat1 , _device.Transform.Projection);

_device.SetVertexShaderConstant(0, mat2);

_device.SetSamplerState(0, SamplerStageStates.MinFilter, (int)Filter.Linear);
_device.SetSamplerState(0, SamplerStageStates.MagFilter, (int)Filter.Linear);
_device.SetSamplerState(1, SamplerStageStates.MinFilter, (int)Filter.Linear);
_device.SetSamplerState(1, SamplerStageStates.MagFilter, (int)Filter.Linear);
_device.SetSamplerState(2, SamplerStageStates.MinFilter, (int)Filter.Linear);
_device.SetSamplerState(2, SamplerStageStates.MagFilter, (int)Filter.Linear);

// Create the vertexdeclaration
VertexElement[] v = new VertexElement[] {
new VertexElement(0,0,DeclarationType.Float3,DeclarationMethod.Default,DeclarationUsage.Position,0)
, new VertexElement(0,12,DeclarationType.Float2,DeclarationMethod.Default,DeclarationUsage.TextureCoordinate,0)
, VertexElement.VertexDeclarationEnd};

_vd = new VertexDeclaration(_device, v);

string error = "";
GraphicsStream gs = ShaderLoader.FromFile(Application.StartupPath + @"\v.vsh", null, ShaderFlags.None, out error);
//GraphicsStream xs = ShaderLoader.CompileShaderFromFile(Application.StartupPath + @"\v.vsh"
// , "", null, "vs_1_1", ShaderFlags.SkipValidation);
_vs = new VertexShader(_device, gs);

gs = ShaderLoader.FromFile(Application.StartupPath + @"\d.psh", null, ShaderFlags.None, out error);
_ps = new PixelShader(_device, gs);

_timer = new HPTimer();
_timer.Start();
}

private void OnVertexBufferCreate(object sender, EventArgs e)
{
VertexBuffer buffer = (VertexBuffer)sender;

_billboard = new CustomVertex.PositionTextured[4];
_billboard[0] = new CustomVertex.PositionTextured(0, 0, 0, 0, 0);
_billboard[1] = new CustomVertex.PositionTextured(128, 0, 0, 1, 0);
_billboard[2] = new CustomVertex.PositionTextured(128, 128, 0, 1, 1);
_billboard[3] = new CustomVertex.PositionTextured(0, 128, 0, 0, 1);

buffer.SetData(_billboard, 0, LockFlags.None);
}

int _frame1 = 0;

protected override void OnPaint(PaintEventArgs e)
{
_device.Clear(ClearFlags.Target, _backColor, 0, 0);

float size, f;
Vector4 v;

f = (float)Math.IEEERemainder(Math.Max(_timer.Time - 2.0f, 0.0f) / 6.0f, 1.2f);
if (f < 1.0f)
size = EXPLOSION_SIZE * (float)Math.Pow(f, 0.3f);
else
size = 0;

// billboard size
v = new Vector4(size, 0.0f, 0.0f, 1.0f);
_device.SetVertexShaderConstant(9, v);

// billboard position
v = new Vector4(0.0f, -6.0f, 0.0f, 0.0f);
_device.SetVertexShaderConstant(10, v);

// depth bias & scale for sprite
float depthScale = MapDepth(EYE_Z) - MapDepth(EYE_Z - size);
float depthBias = MapDepth(EYE_Z);
v = new Vector4(depthScale, depthBias, 0.0f, 0.0f);
_device.SetVertexShaderConstant(11, v);

// noise texture xform
v = new Vector4(0.1f, 0.1f - (float)Math.IEEERemainder(_timer.Time / 4.0f, 1.0f), 1.5f, 1.0f);
_device.SetVertexShaderConstant(12, v);

// fade between fireball and smoke
float fireFade;
if (f > 0.3f)
fireFade = 0.0f;
else
fireFade = 1.0f - f / 0.3f;

// fade out the explosion
float fade = 1.0f - (float)Math.Pow(f, 5.0f);

v = new Vector4(fireFade, fade, 0.0f, 0.0f);
_device.SetPixelShaderConstant(1, v);

// compute currect frame in fireball animation
_frame1 = (int)(Math.Min(1.0f, f / 0.3f) * (_exploTexture.Length - 1));

try
{
_device.BeginScene();

_device.RenderState.Lighting = false;
_device.RenderState.AlphaBlendEnable = true;
_device.RenderState.SourceBlend = Blend.SourceAlpha;
_device.RenderState.DestinationBlend = Blend.InvSourceAlpha;

_device.SetTexture(0, _depthTexture);
_device.SetTexture(1, _nois1Texture);
_device.SetTexture(2, _nois2Texture);
_device.SetTexture(3, _exploTexture[_frame1]);

_device.PixelShader = _ps;
_device.VertexDeclaration = _vd;
_device.VertexShader = _vs;

//_device.VertexFormat = CustomVertex.TransformedTextured.Format;
//_device.SetStreamSource(0, _vb, 0);
//_device.DrawPrimitives(PrimitiveType.TriangleFan, 0, 2);
_device.DrawUserPrimitives(PrimitiveType.TriangleFan, 2, _billboard);


//_frame1 = (_frame1 + 1) % _exploTexture.Length;
}
finally
{
_device.EndScene();
_device.Present();
}

// Thread.Sleep(10);
this.Invalidate();
}

Awesome but it would have been better if you would of put it in source tags