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Not sure if ObjectRayCast works properly.
It works for one object and not another and also the mode for checking against all objects doesn't work at all.

I don't expect to see this fixed, but it seems a bit weird. Maybe there's something I have done to the second model that means it doesn't work?

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Posted: 20th Feb 2014 15:30

I've not had any problems with the 3D collision commands but didn't realise there was a mode for checking all collisions.

What version of AppGameKit are you using, I'm on V108.2 (but really need to download the latest and greatest), and if you upload an example I should be able to look at it today or tomorrow.

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Markus

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Posted: 20th Feb 2014 20:50

i believe it use the collision list.
are the other objects have SetObjectCollisionMode on?
maybe try ObjectSphereCast with radius.
and be sure your surface normals are correct.
or show us example code with your issue.

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nz0

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Posted: 21st Feb 2014 00:51 Edited at: 21st Feb 2014 00:52

Looked at the SetObjectCollisionMode (I wasn't using it). Set it to 1 and no difference.

Other objects without this set work fine.
How do I know my surface normals are "correct" ?

Spherecast is no good, as it's supposed to be causing a light occlusion.

[edit] I'm using 108.19

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Posted: 21st Feb 2014 22:51

Generally you'd check the normals in some 3D modelling software. However, if they're pointing in the wrong direction you would see this when the model was loaded into AppGameKit (the face would be invisible or the model would look "inside out".

It could be that there are gaps in the model but then you'd see intermittent failure with the collision checks. It could be some weird disconnect between what you seen on the screen and the actual vertex data (I've seen this once where someone had a model that was visually 90 degrees to the actual vertex data).

I know you can't use sphere casting for what you ultimately want to do but it's worth having a go as it would help to narrow the problem down.

Is this just happening with a particular model? Is it possible to upload it for us to have a look at?

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Posted: 22nd Feb 2014 10:27 Edited at: 23rd Feb 2014 12:58

edit:
hmm, i agree, i get only the first object!?
(but setcollisionmode was important.)

rem
rem AGK Application 108 19
rem

SetDisplayAspect( 4.0/3.0 )

//------------------------------------------

cameraID=1
SetCameraRange( cameraID, 1, 1000 )
SetCameraPosition( cameraID, 0,5,-15 ) //+100
SetCameraLookAt( cameraID, 0, 0, 5, 0 )

//------------------------------------------

dim cube[6]

i=0
for y#=0.0 to 5.0
    obj=CreateObjectBox( 1, 1, 1 )
    SetObjectPosition( obj, 0, 0.5+(y#*1.1), 5 )
    //SetObjectCollisionMode( obj, 0 ) //Off
    SetObjectCollisionMode( obj, 1 ) //On

SetObjectColor( obj, random(0,255),random(0,255),random(0,255), 192 )

SetObjectLightMode(obj,1)
    i=i+1
    cube[i]=obj
next

//------------------

do

Print("hello 3d raycast")

if 1=1
     ObjectRayCast(0, 0,100,5 , 0,-1,5)
     n=GetObjectRayCastNumHits()
     print("GetObjectRayCastNumHits "+str(n))
     for i=0 to n-1
      obj = GetObjectRayCastHitID(i)
      print("Obj " +str(obj))
      print(GetObjectRayCastY(i))
     next
 endif

if getpointerpressed()=1
    exit
 endif

Sync()
loop
end

rem
rem AGK Application 108 19
rem

SetDisplayAspect( 4.0/3.0 )

//------------------------------------------

cameraID=1
SetCameraRange( cameraID, 1, 1000 )
SetCameraPosition( cameraID, 0,5,-15 ) //+100
SetCameraLookAt( cameraID, 0, 0, 5, 0 )

//------------------------------------------

dim cube[6]

i=0
for y#=0.0 to 5.0
    obj=CreateObjectBox( 1, 1, 1 )
    SetObjectPosition( obj, 0, 0.5+(y#*1.1), 5 )
    //SetObjectCollisionMode( obj, 0 ) //Off
    SetObjectCollisionMode( obj, 1 ) //On

    SetObjectColor( obj, random(0,255),random(0,255),random(0,255), 192 )

    SetObjectLightMode(obj,1)
    i=i+1
    cube[i]=obj
next

//------------------

do

 Print("hello 3d raycast")

 if 1=1
     ObjectRayCast(0, 0,100,5 , 0,-1,5)
     n=GetObjectRayCastNumHits()
     print("GetObjectRayCastNumHits "+str(n))
     for i=0 to n-1
      obj = GetObjectRayCastHitID(i)
      print("Obj " +str(obj))
      print(GetObjectRayCastY(i))
     next
 endif

 if getpointerpressed()=1
    exit
 endif

 Sync()
loop
end

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nz0

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Posted: 22nd Feb 2014 12:42

SetCollisionMode is probably on by default (I didn't disable it, more like didn't set it to anything).

I also don't mean multiple objects hit in the same raycast (although I did try this); I mean something like this where I check for specific objects:

 rc=ObjectRayCast(Refender.ObjID1,GetObjectX(SunObjID),GetObjectY(SunObjID),GetObjectZ(SunObjID),GetCameraX(1),getCameraY(1),getCameraZ(1))
 rc2=ObjectRayCast(SatelliteOBJ,GetObjectX(SunObjID),GetObjectY(SunObjID),GetObjectZ(SunObjID),GetCameraX(1),getCameraY(1),getCameraZ(1))

 if (rc+rc2)=0
  Vis=((FlareX#>0.0) and (FlareX#<1024.0))
  SetSpriteVisible(AnaMorphID,1)
 else
  Vis=0
  SetSpriteVisible(AnaMorphID,0)
 endif

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Posted: 22nd Feb 2014 19:50 Edited at: 22nd Feb 2014 19:51

maybe try paint the pos. with drawline in 2d,from top or side.
from,to + object the ray should hit.

or print("...") the parameters from raycast on screen.

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nz0

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Posted: 22nd Feb 2014 20:43

I drew a line from the sun to the middle of the screen and it all lines up - can't get this model to work with raycast at all, so I uploaded it now if you can check it?

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Posted: 23rd Feb 2014 03:39 Edited at: 23rd Feb 2014 04:28

I think you may have misunderstood the "GetObjectRayCastNumHits" command. From what I understand it returns the number of calculations performed to come up with collision coordinates and not the number of objects that are intersected by the ray cast.

edit: just having another look at the help files, I don't think that's right and I'm going to say that I don't really know what that's all about or how to use it.

from the help file for "GetObjectRayCastNumHits"

Quote: "Returns the number of collisions that occurred in the last collision check. In the case of ObjectRayCast and ObjectSphereCast this will be 0 or 1. For ObjectSphereSlide this could be anywhere between 0 and 4."

But if ObjectRayCast and ObjectSphereCast only have 0 or 1 "hits" then it doesn't seem to be accounting for multiple objects.

Anyway, moving on:

@ nz0, I tried your model and it work perfectly on v1 V108.2. I've created a couple of examples using it. The first will return the id of the first satalite hit and the second loops through all the satalites:

`detects first collision

for i = 1 to 5
    loadObject(i,"dmarsat.obj")
    setObjectPosition(i,0,i-3,0)
    setObjectRotation(i,0,i*90,0)
next i

createObjectBox(11,0.1,0.1,0.1)
setObjectColor(11,0,255,0,255)
setObjectPosition(11,0.5,3,0)
SetObjectCollisionMode(11,0)

createObjectBox(12,0.1,0.1,0.1)
setObjectColor(12,255,0,0,255)
setObjectPosition(12,0.5,-3,0)
SetObjectCollisionMode(12,0)

setCameraPosition(1,0,1,10)
setCameraLookAt(1,0,0,0,0)

do

    for i = 1 to 5

        setObjectColor(i,255,255,255,255)
        rotateObjectGlobalY(i,0.5)

    next i

    hit = ObjectRayCast(0, getObjectX(11),getObjectY(11),getObjectZ(11), getObjectX(12),getObjectY(12),getObjectZ(12))

    if hit <> 0
        setObjectColor(hit,0,0,255,255)
    endif


    sync()

loop

`loop through all objects

for i = 1 to 5
    loadObject(i,"dmarsat.obj")
    setObjectPosition(i,0,i-3,0)
    setObjectRotation(i,0,i*90,0)
next i

createObjectBox(11,0.1,0.1,0.1)
setObjectColor(11,0,255,0,255)
setObjectPosition(11,0.5,3,0)

createObjectBox(12,0.1,0.1,0.1)
setObjectColor(12,255,0,0,255)
setObjectPosition(12,0.5,-3,0)

setCameraPosition(1,0,1,10)
setCameraLookAt(1,0,0,0,0)

do

    for i = 1 to 5

        setObjectColor(i,255,255,255,255)
        rotateObjectGlobalY(i,0.5)

        if ObjectRayCast(i, getObjectX(11),getObjectY(11),getObjectZ(11), getObjectX(12),getObjectY(12),getObjectZ(12)) <> 0
            setObjectColor(i,0,0,255,255)
        endif

    next i

    sync()

loop

Apart from that I don't know why your code wouldn't work.

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Markus

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Posted: 23rd Feb 2014 12:42 Edited at: 23rd Feb 2014 12:57