bloom

Romanski

(Posted 2009) [#1]

hey folks,

does anybody know how to create the bloom-effect with minib3d? does anyone have the code?

Ked	(Posted 2009) [#2]

I don't have any code for you, but here's how you would do it. :)

1. Create a fullscreen quad (I have the code somewhere on this forum)
2. Set EntityFX to (I think) 3, and EntityAlpha to about 0.75.
2. Every loop grab the backbuffer to a texture of about half the screen dimensions (640x480 -> 320x240)
3. Texture the fullscreen quad with the grabbed texture.

Should work like you want. :)

Romanski

(Posted 2009) [#3]

thanks for the tutorial, ked!

so this is the basic code(work in progress):

'paste this after graphics3d:

Global itexblend:Int = 1
Global fsqblend:Int = 1
Global fsqblend2:Int = 1

Global FSTex:TTexture = CreateTexture(800,800)
Global FSQuad:Tmesh = CreateFullScreenQuad(Camera)

'paste this into the loop:

hideentity fsquad

CameraViewport camera,0,0,1280/10,800/10

Renderworld

BackBufferToTex(FStex)

CameraViewport camera,0,0,1280,800
scaletexture fstex,1.635*4.75,-1.6354*4.75
EntityTexture FSQuad,fstex,0,0

showentity fsquad
cameraclsmode(camera,True,True)

renderworld

If KeyHit(key_q) Then
textureblend fstex,itexblend + 1
If itexblend >= 6 Then
itexblend = 0
Else
itexblend = itexblend + 1
End If
End If

If KeyHit(key_e) Then
EntityFX fsquad,fsqblend + 1
If fsqblend >= 6 Then
fsqblend = 0
Else
fsqblend = fsqblend + 1
End If
End If

If KeyHit(key_w) Then
entityblend fsquad,fsqblend2 + 1
If fsqblend2 >= 6 Then
fsqblend2 = 0
Else
fsqblend2 = fsqblend2 + 1
End If
End If

BeginMax2D()
SetColor(255,255,255)
DrawText "itexblend: "+ itexblend,screenwidth - 200,0
DrawText "fsqfx: "+ fsqblend,screenwidth - 200,30
DrawText "fsqblend2"+fsqblend2,screenwidth - 200, 60
EndMax2D()

'paste this after wend:

Function CreateFullScreenQuad:TMesh(parent:TCamera)
Local gwidth:Int=1280,gheight:Int=800

Local mesh:TMesh=CreateMesh(parent)
Local surf:TSurface=CreateSurface(mesh)

AddVertex(surf,-1,1,0,0,0)
AddVertex(surf,3.2,1,0,1,0)
AddVertex(surf,-1,-3.2,0,0,1)
AddVertex(surf,3.2,-3.2,0,1,1)

AddTriangle(surf,0,1,2)
AddTriangle(surf,3,2,1)

PositionEntity mesh,-0.518,0.137,1.009
scaleentity mesh,0.5,0.5,1
'ScaleEntity mesh,1.0,(gwidth/gheight)*1.0,1.0

EntityOrder mesh,-10000
EntityAlpha mesh,0.2
Return mesh
EndFunction

Kryzon

(Posted 2009) [#4]

I think you are scaling your mesh wrong.

It should be...

ScaleEntity mesh,1.0,(gheight*1.0/gwidth),1.0

Off-Topic: boy if that is really functional MiniBlitz3D code (even if the results are undesired), than the thing is simpler than I thought, huh? I mean, most of the B3D functionality is kept; the biggest difference is the Object Orientation.

Romanski

(Posted 2009) [#5]

ok. i think i'm pretty close. I updated the code above. I spent most of the time adjusting the entity and it's texture. I know it's not perfect but it does the job. this is optimized for my screenresolution: 1280x800.

I also added some keyshots(q, w and e) in order to give you the opportunity to play around with the texturesettings.

it looks like this. bloom activated on the left side.

ima747

(Posted 2009) [#6]

Haven't gotten a chance to play with this, but it looks like fun. One thought I had

CameraViewport camera,0,0,1280/10,800/10
could be
CameraViewport camera,0,0,GraphicsWidth()/10,GraphicsHeight()/10
and similarly with the other viewport call

would be resolution independent then I think...

might need some more touches to the FSQuad position or something, haven't really dug into it yet.

Romanski

(Posted 2009) [#7]

yeah and it would be nice to have a "real" blur algorythm for the texture.

SLotman

(Posted 2009) [#8]

bleh

Last edited 2010