Slight Lens Flare Problem ???
Blitz3D Forums/Blitz3D Programming/Slight Lens Flare Problem ???
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| Hi, I have a lens flare system the works fine when the camera moves and the light source is fixed. However, it doesn't work in reverse. That is, when the camera is static and the light source orbits around it. Does anyone know how to code around this? Cheers, RV |
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| you need to be more specific... otherwise I have to make a lot of assumptions. I assume you're using the lens flare that comes with one of the Blitz demos, I assume you're probably moving the wrong thing... if I remember correctly there's a sun flare and a sun pivot, you have to move the pivot. If you post an example (code that will compile to show the problem) I could be a lot more specific. |
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| Okay, here's my code: ;Load in Flare images Function LoadLenses() ;Load 2D lens flare images LensFOrig1 = LoadSprite( "Resources\Sprites\lens1.jpg" ) If LensFOrig1 = 0 Then RuntimeError "file 'lens1.jpg' does not exist!" HideEntity LensFOrig1 ;hide as these entitys only used for CopyEntity() LensFOrig2 = LoadSprite( "Resources\Sprites\lens2.jpg" ) If LensFOrig2 = 0 Then RuntimeError "file 'lens2.jpg' does not exist!" HideEntity LensFOrig2 LensFOrig3 = LoadSprite( "Resources\Sprites\lens3.jpg" ) If LensFOrig3 = 0 Then RuntimeError "file 'lens3.jpg' does not exist!" HideEntity LensFOrig3 LensFOrig4 = LoadSprite( "Resources\Sprites\lens4.jpg" ) If LensFOrig4 = 0 Then RuntimeError "file 'lens4.jpg' does not exist!" HideEntity LensFOrig4 End Function ;Create the Lens Flares Function CreateLensFlares() LensFlare1 = CopyEntity( LensFOrig1, hud_overlay ) ;primary flare ScaleSprite LensFlare1, .35, .35 ;scale according to screen size and size of sprite picture EntityAlpha LensFlare1, .3 ;set alpha blend amount EntityOrder LensFlare1, -2 ;place in front of other entitys HideEntity LensFlare1 ;hide initially LensFlare2 = CopyEntity( LensFOrig3, hud_overlay ) ;first halo ScaleSprite LensFlare2, .25, .25 ;scale is 1/2 of lens flare #1 EntityAlpha LensFlare2, .3 EntityOrder LensFlare2, -3 ;place in front of previous lens flare HideEntity LensFlare2 LensFlare3 = CopyEntity( LensFOrig3, hud_overlay ) ;small burst ScaleSprite LensFlare3, .125, .125 ;scale is 1/4 of lens flare #1 EntityAlpha LensFlare3, .2 EntityOrder LensFlare3, -4 ;place in front of previous lens flare HideEntity LensFlare3 LensFlare4 = CopyEntity( LensFOrig2, hud_overlay ) ;next halo ScaleSprite LensFlare4, .27, .27 ;same scale as lens flare #1 EntityAlpha LensFlare4, .2 EntityOrder LensFlare4, -5 ;place in front of previous lens flare HideEntity LensFlare4 LensFlare5 = CopyEntity( LensFOrig4, hud_overlay ) ;next burst ScaleSprite LensFlare5, .25, .25 ;scale is 1/2 of lens flare #1 EntityAlpha LensFlare5, .15 EntityOrder LensFlare5, -6 ;place in front of previous lens flare HideEntity LensFlare5 LensFlare6 = CopyEntity( LensFOrig2, hud_overlay ) ;next halo ScaleSprite LensFlare6, .125, .125 ;scale is 1/4 of lens flare #1 EntityAlpha LensFlare6, .2 EntityOrder LensFlare6, -7 ;place in front of previous lens flare HideEntity LensFlare6 LensFlare7 = CopyEntity( LensFOrig3, hud_overlay ) ;next burst ScaleSprite LensFlare7, .125, .125 ;scale is 1/4 of lens flare #1 EntityAlpha LensFlare7, .2 EntityOrder LensFlare7, -8 ;place in front of previous lens flare HideEntity LensFlare7 LensFVisible% = False ;lens flares are hidden by default FreeEntity LensFOrig1 FreeEntity LensFOrig2 FreeEntity LensFOrig3 FreeEntity LensFOrig4 End Function Function UpdateLensFlares(sun, cam, d_height, d_width) If LensFlareON=False HideEntity LensFlare1 HideEntity LensFlare2 HideEntity LensFlare3 HideEntity LensFlare4 HideEntity LensFlare5 HideEntity LensFlare6 HideEntity LensFlare7 Else ;-- is the sun in view? and make sure it's not blocked by other blocking entities If EntityInView( sun, cam ) = True And EntityVisible( cam, sun ) = True ;determine sun visible x/y coords using camera 3d to 2d conversion CameraProject cam, EntityX(sun,True), EntityY(sun,True), EntityZ(sun,True) lx = ProjectedX() ;position on 2d screen ly = ProjectedY() ;determine center of screen cx = d_width / 2 cy = d_height / 2 ;determine vector from center to sun's x/y screen position vx = cx - lx vy = cy - ly If vx = 0 And vy = 0 distance# = 1.0 ;to fix sqr(0) fail Else distance# = Sqr( (vx*vx)+(vy*vy) ) ;determine length of vector (pythagoras) EndIf ;normalise vector (determine 1 unit size in x and y coordinates) nx# = vx / distance# ny# = vy / distance# ;== calculate lens flare positions ;calculate lens flare 1 position (maximum distance) f1x = cx - (nx# * distance) f1y = cy - (ny# * distance) ;calculate lens flare 2 position (half distance) f2x = cx - (nx# * (distance/2)) ;could optimize but leaving as divide for readability f2y = cy - (ny# * (distance/2)) ;calculate lens flare 3 position (one third of distance) f3x = cx - (nx# * (distance/3)) f3y = cy - (ny# * (distance/3)) ;calculate lens flare 4 position (one eight distance) f4x = cx - (nx# * (distance/8)) f4y = cy - (ny# * (distance/8)) ;calculate lens flare 5 position f5x = cx - (nx# * (-distance/2)) f5y = cy - (ny# * (-distance/2)) ;calculate lens flare 6 position f6x = cx - (nx# * (-distance/4)) f6y = cy - (ny# * (-distance/4)) ;calculate lens flare 7 position f7x = cx - (nx# * (-distance/5.5)) f7y = cy - (ny# * (-distance/5.5)) ;=== position lens flares entities (relative to camera hud fixed pivot) PositionEntity LensFlare1, f1x, f1y, 1 PositionEntity LensFlare2, f2x, f2y, 1 PositionEntity LensFlare3, f3x, f3y, 1 PositionEntity LensFlare4, f4x, f4y, 1 PositionEntity LensFlare5, f5x, f5y, 1 PositionEntity LensFlare6, f6x, f6y, 1 PositionEntity LensFlare7, f7x, f7y, 1 ;make flares visible? (if not already visible) If LensFVisible% = False ShowEntity LensFlare1 ShowEntity LensFlare2 ShowEntity LensFlare3 ShowEntity LensFlare4 ShowEntity LensFlare5 ShowEntity LensFlare6 ShowEntity LensFlare7 LensFVisible% = True EndIf ;sun not visible from camera Else ;lens flares previously visible? then hide them If LensFVisible% = True HideEntity LensFlare1 HideEntity LensFlare2 HideEntity LensFlare3 HideEntity LensFlare4 HideEntity LensFlare5 HideEntity LensFlare6 HideEntity LensFlare7 LensFVisible% = False EndIf EndIf EndIf End Function ;Example Usage ------------------------------------------ ;Sun = CreatePivot() ;PositionEntity Sun, -199.0, 1000.0, -220.0 ;LoadLenses() ;CreateLensFlares() ;EntityParent Sun, SkyBox ;Main Loop ;Repeat ;. ;. ;TurnEntity SkyBox, 0, -4*g_DeltaT, 0 ;UpdateLensFlares(Sun, g_cam, g_scrheight, g_scrwidth) ;. ;. ;UpdateWorld() ;Renderworld() ;Flip ;Until KeyHit(1)=True ;------------------------------------------------------- Cheers, RV |
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