Possible Particle Subimage bug - GameCreators Forum

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Lavaflyer

12

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Joined: 2nd Jul 2012

Location: Wisconsin, U.S.

Posted: 23rd Dec 2013 22:08

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So I loaded in a spritesheet with a bunch of particles using loadimage (szParentImage). Then I got several images out of the spritesheet by calling loadsubimage (szImage,szParentImage) multiple times. And after testing I found that this method creates ugly white/black lines around all the particles' sprites. In comparison, using the normal method of loading in each particles' image in separately via loadimage, loadimage, loadimage, etc. doesn't have these ugly black lines around all the particles. Just wondering if this is a new bug or is being fixed or what, thanks!

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blastar

11

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Joined: 4th Nov 2013

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Posted: 24th Dec 2013 12:50

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if you use subimages it's better to add an transparent 1-pixel border to each 'tile' to avoid artifacts from resizing.

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Naphier

14

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Joined: 2nd Oct 2010

Location: St Petersburg, Florida

Posted: 24th Dec 2013 15:13

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I've not had any issue like this. What version are you using?
Here's a snippet of my code that sets up my particles for an animation:

imgFile$ = "nutsnbolts.jet"
    atlas = LoadImageEnc(imgFile$)

numParticles = 20
    dim particles[numParticles]

for i = 1 to numParticles
        rndSub = Random(1,6)
        imgName$ = "nb" + str(rndSub) +".png"
        img = LoadSubImage(atlas , imgName$)
        particles[i] = CreateParticles(0 , -10)
        p1 = particles[i]
        SetParticlesAngle(p1 , 45)
        rdmSize = Random(30 , 80)
        r# = rdmSize / 10.0
        SetParticlesVelocityRange(p1 , 0.9 , 1.1)
        SetParticlesSize(p1 , r#)
        SetParticlesDirection(p1 , 0 , particleYdir#)
        SetParticlesImage(p1 , img)
        SetParticlesPosition(p1 , 0 , particleY#)
        SetParticlesStartZone(p1 , 40 , 0 , 60 , 0)
        SetParticlesLife(p1 , 5)
        SetParticlesMax(p1 , 50 / numParticles)
        SetParticlesFrequency(p1 , 8)
        SetParticlesActive(p1 , 0)
        if iInitiator = 0
            AddParticlesForce(p1 , 0.5 , 2 , 0 , 30)
            AddParticlesForce(p1 , 2 , 3 , 0 , 40)
            AddParticlesForce(p1 , 3 , 4 , 0 , 50)
        endif
        SetParticlesDepth(p1 , TOPBAR_DEPTH + 5)
    next i

+ Code Snippet

imgFile$ = "nutsnbolts.jet"
    atlas = LoadImageEnc(imgFile$)

    numParticles = 20
    dim particles[numParticles]

    for i = 1 to numParticles
        rndSub = Random(1,6)
        imgName$ = "nb" + str(rndSub) +".png"
        img = LoadSubImage(atlas , imgName$)
        particles[i] = CreateParticles(0 , -10)
        p1 = particles[i]
        SetParticlesAngle(p1 , 45)
        rdmSize = Random(30 , 80)
        r# = rdmSize / 10.0
        SetParticlesVelocityRange(p1 , 0.9 , 1.1)
        SetParticlesSize(p1 , r#)
        SetParticlesDirection(p1 , 0 , particleYdir#)
        SetParticlesImage(p1 , img)
        SetParticlesPosition(p1 , 0 , particleY#)
        SetParticlesStartZone(p1 , 40 , 0 , 60 , 0)
        SetParticlesLife(p1 , 5)
        SetParticlesMax(p1 , 50 / numParticles)
        SetParticlesFrequency(p1 , 8)
        SetParticlesActive(p1 , 0)
        if iInitiator = 0
            AddParticlesForce(p1 , 0.5 , 2 , 0 , 30)
            AddParticlesForce(p1 , 2 , 3 , 0 , 40)
            AddParticlesForce(p1 , 3 , 4 , 0 , 50)
        endif
        SetParticlesDepth(p1 , TOPBAR_DEPTH + 5)
    next i

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