how to get the ID of the X,Y picked object in 3D ?

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MikeMax

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Posted: 11th Nov 2012 22:02 Edited at: 14th Nov 2012 17:29

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Hello,

Not sure how to use the Get3DVectorXFromScreen,Get3DVectorYFromScreen,Get3DVectorZFromScreen functions ...

I have tried to cast the object between the normalized vector and the same vector*10 ... and between camera and vector*10 ... It seems it doesn't work ...

But i certainly make a mistake ...

any code to help ?

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MikeMax

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Posted: 14th Nov 2012 17:28

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up ?

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Alpha Mike

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Posted: 17th Nov 2012 10:22

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Did you ever figure this out?

I was mucking about with it last night.

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Jimmanator

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Posted: 19th Nov 2012 00:58 Edited at: 19th Nov 2012 01:02

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Do you mean like this,
it returns the x,y and z values of the surface of the cube

+ Code Snippet




createobjectbox(1,100,100,100)
movecameralocalz(1,-300)

do

 worldX# = Get3DVectorXFromScreen( GetPointerX(), GetPointerY() ) * 800
    worldY# = Get3DVectorYFromScreen( GetPointerX(), GetPointerY() ) * 800
    worldZ# = Get3DVectorZFromScreen( GetPointerX(), GetPointerY() ) * 800

    worldX# = worldX# + GetCameraX( 1 )
    worldY# = worldY# + GetCameraY( 1 )
    worldZ# = worldZ# + GetCameraZ( 1 )

 obj=ObjectRayCast(1,getcamerax(1),getcameray(1),getcameraz(1), worldx#,worldy#,worldz#)
if obj

print ("object: "+str(obj))
print ( "X: "+str(GetObjectRayCastX(0)) )
print ( "Y: "+str(GetObjectRayCasty(0)))
print ( "Z: "+str(GetObjectRayCastz(0)))
endif
    sync()


    loop

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MikeMax

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Posted: 21st Nov 2012 01:40

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Thanks Jimmanator,

i forgotten to add camera position in the "target" ray coords (...).

But for some reason i had to make some changes to get it working :

+ Code Snippet


   worldX# = Get3DVectorXFromScreen( GetPointerX(), GetPointerY() ) * 800
    worldY# = Get3DVectorYFromScreen( GetPointerX(), GetPointerY() ) * 800
    worldZ# = Get3DVectorZFromScreen( GetPointerX(), GetPointerY() ) * 800

    worldX# = worldX# + GetCameraX( 1 )
    worldY# = worldY# + GetCameraY( 1 )
    worldZ# = worldZ# + GetCameraZ( 1 )

   
   // ObjectSphereCast (with a very small radius) instead of ObjectRayCast which doesn't work in my case (why ? i don't know)
    ObjectSphereCast(0,getcamerax(1),getcameray(1),getcameraz(1), worldX#,worldY#,worldZ#,0.001)


    if (GetObjectRayCastNumHits()>0)
        // I have to get the last ID to get the nearest (first) object (why Hit indexes are reversed ? due to 3D Screen transformation or raycast parameters inversion maybe ?...)
        DebugLog(str(GetObjectRayCastHitID( GetObjectRayCastNumHits()-1 )))
        // make it red :)
        SetObjectColor(GetObjectRayCastHitID( GetObjectRayCastNumHits()-1 ),255,0,0,255)
    endif

And then ... everything work as expected

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