Quad Particles

This I adapted from SimonH example with BMAX.
And want to have the particle effect work with OpenGL. So I firstly wrote it into B3D (which works great), and attempted to implement it with BMAX.

However it behaves very oddly, and I feel im doing allsorts of mistakes. Please could you help me fix it;? thanks.

Const XRES=640
Const YRES=480
Const RRES= 32

bglCreateContext(XRES,YRES,RRES,0,BGL_BACKBUFFER | BGL_DEPTHBUFFER | BGL_FULLSCREEN)
HideMouse


Global texname:Int

Global ParticleList:TList = New TList

'
' Create the Fireworks as a type.
'
Type Fireworks
	
	Field x#,y#,z#
	
	Field vy#
	
	Field xd#,yd#,zd#
	
	Field r#,g#,b#
	
	Field alpha#

End Type

Global ParticleCount

InitOpenGL()

	
While Not KeyHit(KEY_ESCAPE)
	
	If MouseHit(1) Then CreateFireworks()

	RenderOpenGL()
	
	bglSwapBuffers()
Wend



Function RenderOpenGL()

Local Update:Fireworks

glClear 		(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT)					' Clear The Screen And The Depth Buffer
glLoadIdentity	()

glBindTexture	(GL_TEXTURE_2D,Texname)								' Select Our Texture
	
	For Update = EachIn ParticleList
		
		glColor4f( Update.r, Update.g, Update.b, Update.Alpha)

		glTranslatef	(Update.x,Update.y,Update.z)			
	
	
		glBegin		(GL_QUADS)								'Draw using Quads.

			glVertex3f(-1.0,  1.0, 0.0)							'Top Left.
			glVertex3f( 1.0,  1.0, 0.0)							'Top Right.
			glVertex3f( 1.0,- 1.0, 0.0)							'Bottom Right.
			glVertex3f(-1.0,- 1.0, 0.0)							'Bottom Left.

		glEnd()												'Done Drawing The Quad.
	
		
		Update.Alpha = Update.Alpha - .01
		
		If Update.Alpha <0
			ParticleList.Remove Update
		End If
		
		update.x		= update.x 		+ update.xd * 10
		update.y		= update.y 		+ update.yd * 10
		update.z		= update.z 		+ update.zd * 10
		
		update.y		= update.y		+ update.vy
		update.vy		= update.vy		+ 0.02
		
		
	Next
	
End Function



Function CreateFireworks()

'
' Here we go For starters.
'		
Local x#=Rand( -5, 5 )
Local y#=Rand( -5, 5 )
Local z#=-20

'
' Colour scheme For this New batch of fireworks,
'
Local r#=Rand( 2 )
Local g#=Rand( 2 )
Local b#=Rand( 2 )

Local create:Fireworks 

For Local amount=1 To 100

	Local speed# 	= Rand(0.05,0.01)

	Local ang1# 	= Rand( 360 )
	Local ang2# 	= Rand( 360 )

	create		= New Fireworks
	
	create.x		= x#
	create.y		= y#
	create.z		= z#

	create.xd		= Cos( ang1# ) * Cos( ang2# ) * speed#
	create.yd		= Cos( ang1# ) * Sin( ang2# ) * speed#
	create.zd		= Sin( ang1# ) * speed#
	
	create.r		= r
	create.g		= g
	create.b		= b
	
	create.alpha	= 1
	
	ParticleList.Addlast Create

Next

End Function


Function InitOpenGL()

	LoadGLTextures	()
	
	glEnable		(GL_TEXTURE_2D)									' Enable Texture Mapping
	glShadeModel	(GL_SMOOTH)										' Enable Smooth Shading
	
	glClearColor	(0.0, 0.0, 0.0, 0.0)								' Black Background
	glClearDepth	(1.0)											' Depth Buffer Setup
	
	glDisable		(GL_DEPTH_TEST)									' Disable Depth Testing
	glEnable		(GL_BLEND)										' Enable Blending
	
	glBlendFunc	(GL_SRC_ALPHA,GL_ONE)								' Type Of Blending To Perform
	glDepthFunc	(GL_LEQUAL)										' The Type Of Depth Testing To Do
	
	glHint		(GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST)				' Really Nice Perspective Calculations
	
	glViewport	(0,0,XRES,YRES)									' Set viewport
	glMatrixMode	(GL_PROJECTION)									' Select The Projection Matrix
	glLoadIdentity	()												' Reset The Projection Matrix
	
	gluPerspective	(45.0,Float(XRES)/Float(YRES),0.1,100.0)				' Calculate Aspect Ratio 
	glMatrixMode	(GL_MODELVIEW)										' Select The Modelview Matrix
	glLoadIdentity	()

End Function



Function LoadGLTextures()
	
	Local TextureImage:TPixmap
	
	TextureImage:TPixmap=LoadPixmap("media/Spark.png")					' Load Particle Texture
	
	glGenTextures	(1, Varptr Texname)									' Create One Texture
	
	glBindTexture	(GL_TEXTURE_2D, Texname)
	
	glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_LINEAR)
	glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR)
	
	glTexImage2D	(GL_TEXTURE_2D, 0, 3, TextureImage.width, TextureImage.height,..
	 				0, GL_RGB, GL_UNSIGNED_BYTE, TextureImage.pixels)
End Function

Huge Thanks,
Thumbz.