ParticleGenerator Class

    Public Structure Particles
        Public fade As Double
        Public r, g, b, a As Double
        Public x, y, z As Double
        Public xi, yi, zi As Double
        Public xg, yg, zg As Double
    End Structure
    Public Class ParticleGenerator 'By Devintelo 
        Public Shared AssignedTexture As Integer = 0
        Public Shared MaxParticles As Integer = 500
        Public Shared UsePoint As Boolean = True
        Public Shared Life As Single = 1
        Public Shared Source As Vector3 = New Vector3(0, 0, 0)
        Public Shared Direction As Vector3 = New Vector3(0, 100, 0)
        Public Shared Gravity As Vector3 = New Vector3(0, -1, 0)
        Public Shared RandomPos As Single = 1
        Public Shared RandomDir As Single = 10
        Public Shared VecUp As New Vector3(0, 1, 0)
        Public Shared VecDown As New Vector3(0, -1, 0)
        Public Shared Particle(MaxParticles) As Particles
        Public Sub New(ByVal Texture As Integer, ByVal Src As Vector3, ByVal _Direction As Vector3, _
                       ByVal Grvt As Vector3, Optional ByVal RndDir As Integer = 1, _
                       Optional ByVal _Life As Single = 1, Optional ByVal Max As Integer = 500, Optional ByVal _UsePoint As Boolean = True)
 
            AssignedTexture = Texture
            Source = Src
            Direction = _Direction
            Gravity = Grvt
            RandomDir = RndDir
            Life = _Life
            MaxParticles = Max
            UsePoint = _UsePoint
            ReDim Particle(Max)
            InitParticles()
        End Sub
 
        Public Sub InitParticles()
            For i As Integer = 0 To MaxParticles
                With Particle(i)
                    .fade = CDbl(Random(50, 100)) / 3000
                    .r = Random(0, 10) / 10
                    .g = Random(0, 10) / 10
                    .b = Random(0, 10) / 10
                    .a = Life
 
                    .x = Source.X
                    .y = Source.Y
                    .z = Source.Z
 
                    .xi = Direction.X + (Random(-RandomDir * 100, RandomDir * 100) / 100) 'Choisis ton facteur de hazard
                    .yi = Direction.Y + (Random(-RandomDir * 100, RandomDir * 100) / 100)
                    .zi = Direction.Z + (Random(-RandomDir * 100, RandomDir * 100) / 100)' *100 and / 100 is because it returns as integer and we need more probability !
 
                    .xg = Gravity.X
                    .yg = Gravity.Y
                    .zg = Gravity.Z
                End With
            Next
        End Sub
        Public Sub ReviveParticle(ByVal i As Integer)
            With Particle(i)
                .fade = CDbl(Random(50, 100)) / 3000
                .r = Random(0, 10) / 10
                .g = Random(0, 10) / 10
                .b = Random(0, 10) / 10
                .a = Life
 
                .x = Source.X
                .y = Source.Y
                .z = Source.Z
 
                .xi = Direction.X + (Random(-RandomDir * 100, RandomDir * 100) / 100)'Pareil
                .yi = Direction.Y + (Random(-RandomDir * 100, RandomDir * 100) / 100)
                .zi = Direction.Z + (Random(-RandomDir * 100, RandomDir * 100) / 100)'The same
 
                .xg = Gravity.X
                .yg = Gravity.Y
                .zg = Gravity.Z
            End With
        End Sub
        Public Sub DrawParticles()
            GL.Disable(EnableCap.Lighting)
            GL.BindTexture(TextureTarget.Texture2D, Form1.textures(8))
            GL.BlendFunc(BlendingFactorSrc.SrcAlpha, BlendingFactorDest.OneMinusSrcAlpha)
 
            If UsePoint = True Then
                GL.TexEnv(TextureEnvTarget.PointSprite, TextureEnvParameter.CoordReplace, 1)
                GL.PointParameter(PointParameterName.PointDistanceAttenuation, New Single() {0.0, 1 / 5.0, 0.0})
                GL.PointParameter(PointParameterName.PointSizeMax, 50)
                GL.PointParameter(PointParameterName.PointSizeMin, 1)
                GL.Enable(EnableCap.PointSprite)
            End If
 
            For i As Integer = 0 To MaxParticles
                Dim x As Single = Particle(i).x
                Dim y As Double = Particle(i).y
                Dim z As Double = Particle(i).z
 
                GL.PointSize(35)
 
                If UsePoint = True Then
                    GL.Color4(1, 1, 1, Particle(i).a)
                    GL.Begin(BeginMode.Points)
                    GL.Vertex3(x, y, z)
                    GL.End()
                Else
                    GL.Color4(1, 1, 1, Particle(i).a)'Useless , because quads can't rotate (too hard for me)
                    GL.Begin(BeginMode.TriangleStrip)
                    GL.TexCoord2(1, 1) : GL.Vertex3(x + 0.1, y + 0.1, z)
                    GL.TexCoord2(1, 0) : GL.Vertex3(x + 0.1, y - 0.1, z)
                    GL.TexCoord2(0, 1) : GL.Vertex3(x - 0.1, y + 0.1, z)
                    GL.TexCoord2(0, 0) : GL.Vertex3(x - 0.1, y - 0.1, z)
                    GL.End()
                End If
 
                'Deplacement
                Particle(i).x += Particle(i).xi / 50
                Particle(i).y += Particle(i).yi / 50
                Particle(i).z += Particle(i).zi / 50
 
                'Gravité
                Particle(i).xi -= Particle(i).xg / 10
                Particle(i).yi -= Particle(i).yg / 10
                Particle(i).zi -= Particle(i).zg / 10
 
                'Vie
                Particle(i).a -= Particle(i).fade
 
 
                'Si elle est morte , on la régénère
                If Particle(i).a < 0 Then
                    ReviveParticle(i)
                End If
            Next
            GL.Enable(EnableCap.Lighting)
            GL.Color4(1, 1, 1, 0.999)
        End Sub
        Function Random(ByVal min As Integer, ByVal max As Integer) As Integer'The random function used at the reviveparticle sub
            Dim generator As New Random
            Return generator.Next(min, max)
        End Function
    End Class