[bb] Simple lensflare by Rob [ 1+ years ago ]

[BlitzBot]

Title : Simple lensflare
Author : Rob
Posted : 1+ years ago

Description : Compatible with various 2D in 3D sprite libs and so forth for ease of use.

Code :

Code (blitzbasic) Select Expand

;lensflare example for 2D and 3D
;rob@redflame.net

Graphics3D 640,480,16,2

;required
Global viewx=GraphicsWidth(),viewy=GraphicsHeight()

camera=CreateCamera()
CameraRange camera,1,2000
HidePointer()

;make a sun
sun=CreateSphere()
EntityColor sun,255,255,0
EntityFX sun,1
ScaleEntity sun,100,100,100
PositionEntity sun,800,600,800

;level
p=CreatePlane()
PositionEntity p,0,-10,0

While Not KeyHit(1)

;mouse
mxspd#=MouseXSpeed()*0.25
myspd#=MouseYSpeed()*0.25
MoveMouse viewx/2,viewy/2

;rotate view
pitch#=pitch#+myspd#
If pitch#<-90 Then pitch#=-90
If pitch#>90 Then pitch#=90
yaw#=yaw#-mxspd#
RotateEntity camera,pitch#,yaw#,0


RenderWorld

;update flare (if using 3D, place before renderworld)
updateflare(camera,sun)

Flip
Wend
End

Function updateflare(camera,source)
CameraProject camera,EntityX(source,1),EntityY(source,1),EntityZ(source,1)
x#=ProjectedX()/viewx
y#=ProjectedY()/viewy

;if on screen
If (x>0 And x<=1) And (y>0 And y<=1)

;-1 to 1
xoffset# = (x-0.5)*2
yoffset# = (y-0.5)*2

;notes:

;Flares: (use sprites and a sprite lib to translate from 3D to 2D.
;For now, we use 2D to illustrate. Multiply offsets however you like.
;Oval coords corrected for offset - not needed with 3D sprites.


;flare 1
flare1_x# = (viewx/2) - (xoffset*640)
flare1_y# = (viewy/2) - (yoffset*320)
Oval flare1_x-16,flare1_y-16,32,32,0

;flare 2
flare2_x# = (viewx/2) - (xoffset*64)
flare2_y# = (viewy/2) - (yoffset*32)
Oval flare2_x-100,flare2_y-100,200,200,0

;flare 3
flare3_x# = (viewx/2) - (xoffset*500)
flare3_y# = (viewy/2) - (yoffset*250)
Oval flare3_x-64,flare3_y-64,128,128,0


EndIf
End Function

Comments :


psychicbottle(Posted 1+ years ago)

 huh this is very cool and useful