How Parent/Children works?

[swipisParticipant]

Hello,

I am new to Monkey2 and want to know how can I set object to be a parent and another object to be a child (both objects are Models). And does Parent rotation will apply to its child (if I rotate parent)?

Thank you.

[Mark SiblyKeymaster]

Use the ‘Parent’ property to change an entity’s parent, eg:

Monkey

Local model1:=Model.Load( "blah..." ) Local model2:=Model.Load( "blah..." ) model1.Parent=model2 'make model1 a child of model2

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Local model1:=Model.Load( "blah..." ) Local model2:=Model.Load( "blah..." ) model1.Parent=model2   'make model1 a child of model2

You can also set an entity’s parent to ‘null’, meaning the entity is in ‘world space’.

[swipisParticipant]

Thank you Mark! And how about Parent rotation will it apply to its children automatically?

[Mark SiblyKeymaster]

Yes, it’s very much like blitz3d (if you’ve ever used that)!

A child entity’s position, rotation and scale are all relative to the parent entity. So moving, rotating, scaling the parent will also move, rotate, scale the child.

[swipisParticipant]

Thank you again, I trying to rotate parent but parent and child not rotating did something wrong. And about blitz no I did not use, I heard about Monkey2 2 days ago and I like so far!

 

Thank you again!

[Mark SiblyKeymaster]

Here’s a little demo…

Monkey

Namespace myapp3d #Import "<std>" #Import "<mojo>" #Import "<mojo3d>" Using std.. Using mojo.. Using mojo3d.. Class MyWindow Extends Window Field _scene:Scene Field _camera:Camera Field _light:Light Field _ground:Model Field _donut:Model Method New( title:String="Simple mojo3d app",width:Int=640,height:Int=480,flags:WindowFlags=WindowFlags.Resizable ) Super.New( title,width,height,flags ) 'create (current) scene ' _scene=Scene.GetCurrent() 'create camera ' _camera=New Camera _camera.Viewport=Rect _camera.AddComponent<FlyBehaviour>() _camera.Move( 0,10,-5 ) 'create light ' _light=New Light _light.CastsShadow=True _light.RotateX( 90 ) 'create ground ' Local groundBox:=New Boxf( -50,-1,-50,50,0,50 ) Local groundMaterial:=New PbrMaterial( Color.Green ) _ground=Model.CreateBox( groundBox,1,1,1,groundMaterial ) _ground.CastsShadow=False 'create dount ' Local donutMaterial:=New PbrMaterial( Color.Brown ) _donut=Model.CreateTorus( 2,.5,48,24,donutMaterial ) _donut.Move( 0,10,0 ) 'Add a child! Local child:=Model.CreateBox( New Boxf(-1,1),1,1,1,New PbrMaterial( Color.Red ) ) child.Parent=_donut child.LocalPosition=New Vec3f( 0,-2,0 ) End Method OnRender( canvas:Canvas ) Override RequestRender() _camera.Viewport=Rect _donut.Rotate( .2,.4,.6 ) _scene.Update() _scene.Render( canvas ) canvas.DrawText( "FPS="+App.FPS,0,0 ) End End Function Main() New AppInstance New MyWindow App.Run() End

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Namespace myapp3d   #Import "<std>" #Import "<mojo>" #Import "<mojo3d>"   Using std.. Using mojo.. Using mojo3d..   Class MyWindow Extends Window Field _scene:Scene Field _camera:Camera Field _light:Light Field _ground:Model Field _donut:Model Method New( title:String="Simple mojo3d app",width:Int=640,height:Int=480,flags:WindowFlags=WindowFlags.Resizable )   Super.New( title,width,height,flags ) 'create (current) scene ' _scene=Scene.GetCurrent() 'create camera ' _camera=New Camera _camera.Viewport=Rect _camera.AddComponent<FlyBehaviour>() _camera.Move( 0,10,-5 ) 'create light ' _light=New Light _light.CastsShadow=True _light.RotateX( 90 ) 'create ground ' Local groundBox:=New Boxf( -50,-1,-50,50,0,50 ) Local groundMaterial:=New PbrMaterial( Color.Green ) _ground=Model.CreateBox( groundBox,1,1,1,groundMaterial ) _ground.CastsShadow=False 'create dount ' Local donutMaterial:=New PbrMaterial( Color.Brown ) _donut=Model.CreateTorus( 2,.5,48,24,donutMaterial ) _donut.Move( 0,10,0 ) 'Add a child! Local child:=Model.CreateBox( New Boxf(-1,1),1,1,1,New PbrMaterial( Color.Red ) ) child.Parent=_donut child.LocalPosition=New Vec3f( 0,-2,0 ) End Method OnRender( canvas:Canvas ) Override RequestRender() _camera.Viewport=Rect _donut.Rotate( .2,.4,.6 )   _scene.Update() _scene.Render( canvas ) canvas.DrawText( "FPS="+App.FPS,0,0 ) End End   Function Main()   New AppInstance New MyWindow App.Run() End

[swipisParticipant]

Thank you!

[Author]

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