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Depth of Field?

BlitzMax Forums/MiniB3D Module/Depth of Field?

ima747(Posted 2007) [#1]
Just getting started with minib3d and I have limited 3d coding experience so appologies if I'm newbish.

Is there any way to impliment a depth of field effect in minib3d? either easily (some magical "setcameraDoF" function I'm missing) or to fudge it in a more complex fashion (some objects I could attack to the camera at various distances that would blur to varying degrees everything past them...)


ksalomao(Posted 2007) [#2]
HI,
Since minib3d is inspired in blitz3d, you should check out blitz3d forum for more info. If you want a fade effect you could use "EntityAutoFade" to set the alpha accoding with the distance from the camera.
But If you want a blur effect, you should try a filter in front of the camera or render twice, there are some codes in the archive and in the blitz3d forum:
DreamFilter
Montion Blur FX
Motion blur
3d blur


ima747(Posted 2007) [#3]
very cool, I was affraid it might be a little too simple to support something like that. It looks like I can find some way to do it, or atleast fudge it, in there somewhere.


bradford6(Posted 2007) [#4]
as far as i know, depth of field effects are done (or can be done) via Shaders. a Shader is a program that runs on the video cards GPU.

miniB3D does not support shaders by default but user Klepto2 has created an extended version of minib3d that supports GLSL (OpenGL Shader Language)

fish around these forums and you will find some stuff.

check this out
http://ati.amd.com/developer/gdc/Scheuermann_DepthOfField.pdf


IceVAN(Posted 2007) [#5]
Hello

ima747 try this code.

The original code is for blitz3d. I have modified it for minib3d

';
'; Depth of Field
';
'; Created by Mikkel Fredborg
'; Use as you please!
';
' Modified for Blitzmax by IceVAN/Purples Studios

Import sidesign.minib3d


Graphics3D 800,600,32,True
'SetBuffer BackBuffer()

HideMouse

';
'; Create a camera...
camera = CreateCamera()
CameraRange camera,0.1,1000.0
CameraFogMode camera,True
CameraFogRange camera,100,1000
CameraClsColor camera,220,220,220

';
'; create some cubes
For i = 0 To 300
	cube = CreateCube()
	PositionEntity cube,Rnd(-200,200),Rnd(-200,200),Rnd(-200,200)
	RotateEntity cube,Rnd(-180,180),Rnd(-180,180),Rnd(-180,180)
	ScaleEntity cube,Rnd(1,20),Rnd(1,20),Rnd(1,20)
	EntityColor cube,Rand(0,255),Rand(0,255),Rand(0,255)
Next
			
';
'; Light
light = CreateLight()
RotateEntity light,90,0,0

'; Depth of Field setup
Type DepthOfField
	Field layers
	Field layer[99]
	Field texture:ttexture
	Field tsize
	Field tbuffer:ttexture
	Field near#,far#
	Field camera
End Type

dof:DepthOfField = DOF_Create(camera,10,2.0)

Repeat
	RotateEntity camera,MouseY(),MouseX(),0
	MoveEntity camera,KeyDown(KEY_RIGHT)-KeyDown(KEY_LEFT),0,KeyDown(KEY_UP)-KeyDown(KEY_DOWN)

	DOF_Update(dof)
	
	RenderWorld
	
	Flip False

Until KeyHit(KEY_ESCAPE)

End

Function DOF_Update(dof:depthoffield)

	HideEntity dof.layer[0]

	CameraRange dof.camera,dof.near*.95,1000
	CameraViewport dof.camera,0,0,dof.tsize,dof.tsize
	RenderWorld
'	CopyRect 0,0,dof.tsize,dof.tsize,0,0,BackBuffer(),dof.tbuffer
	BackBufferToTex(dof.tbuffer)

	
	ShowEntity dof.layer[0]

	CameraRange dof.camera,0.1,1000
	CameraViewport dof.camera,0,0,GraphicsWidth(),GraphicsHeight()
	
End Function

Function DOF_Create:DepthOfField(camera,layers,spread#=0.0)

	dof:depthoffield = New depthoffield

	dof.camera = camera

	dof.layers = layers

	dof.tsize	 = 512
	dof.near	 = 100.0
	dof.far		 = 200.0
	
	ClearTextureFilters
	dof.texture = CreateTexture(dof.tsize,dof.tsize,1+256+16+32)
'	dof.tbuffer = TextureBuffer(dof.texture)
	dof.tbuffer = dof.texture
	
	ang# = 360.0/Float(dof.layers)
	For i = 0 To dof.layers-1
		dof.layer[i] = CreateFace(1)
			
		EntityAlpha dof.layer[i],1.0/Float(dof.layers)
		EntityFX	dof.layer[i],1+8+16
	
		ps# = dof.near+(i*((dof.far-dof.near)/Float(dof.layers)))

		px# = Sin(i*ang)*(i/Float(dof.layers))*spread
		py# = Cos(i*ang)*(i/Float(dof.layers))*spread
		
		PositionEntity dof.layer[i],px,py,ps
		ScaleEntity dof.layer[i],ps,ps,1.0		
	
		EntityTexture dof.layer[i],dof.texture
		
		If i = 0
			EntityParent dof.layer[i],dof.camera,True
		Else
			EntityParent dof.layer[i],dof.layer[i-1],True
		End If
	Next

	Return dof

End Function

Function CreateFace(segs=1,parent=0)

	mesh=CreateMesh( parent )
	surf=CreateSurface( mesh )
	stx#=-1.0
	sty#=stx
	stp#=Float(2)/Float(segs)
	y#=sty
	For a=0 To segs 
		x#=stx
		v#=a/Float(segs)
		For b=0 To segs
			u#=b/Float(segs)
			AddVertex(surf,x,y,0,u,v) ; 'swap these For a different start orientation
			x=x+stp
		Next
		y=y+stp
	Next
	For a=0 To segs-1
		For b=0 To segs-1
			v0=a*(segs+1)+b
			v1=v0+1
			v2=(a+1)*(segs+1)+b+1
			v3=v2-1
			AddTriangle( surf,v0,v2,v1 )
			AddTriangle( surf,v0,v3,v2 )
		Next
	Next
	
	FlipMesh mesh
	
	UpdateNormals mesh
	'EntityFX(mesh,17)
	Return mesh
	
End Function



ima747(Posted 2007) [#6]
Just gave it a try and works great. I've gotta tear it apparet and A) figure out what you did and B) tweak it so it works just right for my needs but yea, code archives for this perhaps?