How to import obj model and how to use color alpha

[swipisParticipant]

Hello, I tried to import model (obj file made in blender) I did:

Monkey

Local shipmesh := Mesh.Load("test.obj") Local shipmat := New PbrMaterial(New Color(1,0,0)) ship = New Model(shipmesh, shipmat)

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Local shipmesh := Mesh.Load("test.obj") Local shipmat := New PbrMaterial(New Color(1,0,0)) ship = New Model(shipmesh, shipmat)

but I can’t see my model at run time.

Second question is how to use color alpha?

Monkey

New Color(1,0,0, ?)

1	New Color(1,0,0, ?)

And last question can make an empty object and make it parent (in some other game engine can be called Position node, in unity – GameObject)?

 

Thank you!

[HezkoreParticipant]

For OBJ loading you’ll have to do #Import “<mojo3d-loaders>”
But I would recommend exporting to GLTF or GLB using Blender, as those are supported by Mojo3D directly.
Other formats are loaded using “assimp”

Alpha is just as you wrote it.
canvas.Color=New Color(1,0,0,0.5) where the last parameter is alpha.
Though I don’t think Mojo3D supports it?

Mojo3D entities has “Parents” if that’s what you mean?

[swipisParticipant]

Thank you for answers

Alpha looks like not working (at least for me, no matter alpha = 0 or =1 result the same).

I loaded GLTF model but still can’t see in my scene… What can be wrong?

[HezkoreParticipant]

Head over to your Monkey2 folder, then go to ” modules/mojo3d/tests/ ”
You’ll have a bunch of examples there and some of them load models, so you could just copy that.

[swipisParticipant]

Than you, will look at these examples!

[EthernautParticipant]

It’s possible that your model is too small or too big. Try using “ship.Mesh.FitVertices( New Boxf )” to fit everything into a 1x1x1 box, then place your camera accordingly ( moving to “0,2,5” is a good starting point, then “camera.PointAt( ship )” to point at model ).

[swipisParticipant]

OK when I did as you told but still can’t see my model and no errors what so ever… sometimes I getting “Memory access violation” here is code:

Monkey

mycamera.Move(0,10,25) ship=Model.Load( "asset::test2.gltf" ) ship.Mesh.FitVertices(New Boxf(1,1),False) mycamera.PointAt(ship)

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mycamera.Move(0,10,25)   ship=Model.Load( "asset::test2.gltf" ) ship.Mesh.FitVertices(New Boxf(1,1),False)   mycamera.PointAt(ship)

Any ideas what is wrong?

[Mark SiblyKeymaster]

This is often a sign that your model isn’t loading properly.

What you can do is put ‘Assert( model )’ after the Model.Load call to verify it did in fact load correctly.

Can you post the entire sourcec code? It’s generally much easier for us to spot problems if we can see the entire progam.

[swipisParticipant]

Hi Mark, Assert(model) did not output anything, anyway here is all code:

Monkey

Namespace test3 #Import "<std>" #Import "<mojo>" #Import "<mojo3d>" #Import "assets/" Using std.. Using mojo.. Using mojo3d.. 'The new mojo 3d module.

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Namespace test3 #Import "<std>" #Import "<mojo>" #Import "<mojo3d>"   #Import "assets/"     Using std.. Using mojo.. Using mojo3d.. 'The new mojo 3d module.

 

 

Monkey

Class MyWindow Extends Window Field myscene:Scene Field mycamera:Camera Field mylight:Light Field ship:Model Field yawEntity:Entity Field pitchEntity:Entity Method New( title:String="Simple mojo app",width:Int=640,height:Int=480,flags:WindowFlags=WindowFlags.Resizable ) Super.New( title,width,height,flags ) ' Get the current scene myscene=Scene.GetCurrent() 'create camera ' mycamera = New Camera mycamera.Viewport=Rect mycamera.Near = 1 '?? mycamera.Far = 1000 'how far should we render mycamera.FOV = 60 'create light ' mylight = New Light mylight.RotateX(Pi/2) 'aim directional light 'down' - Pi/2=90 degrees. ship=Model.Load( "asset::test2.gltf" ) Assert(ship) ship.Mesh.FitVertices(New Boxf(1,1),False) mycamera.Move(0,10,25) 'move the camera to position x,y,z mycamera.PointAt(ship) 'ship = Model.Load( "asset::test.gltf" ) yawEntity = New Entity pitchEntity = New Entity pitchEntity.Parent = yawEntity mycamera.Parent = pitchEntity End Method ' This method is the main loop. Method OnRender( canvas:Canvas ) Override RequestRender() myscene.Update() UpdateInput() mycamera.Render( canvas ) 'myscene.Render( canvas,mycamera ) 'render the 3d scene If Keyboard.KeyReleased(Key.Escape) Then App.Terminate() canvas.DrawText("FPS = " + App.FPS,0,0) End Method End Class Function Main() New AppInstance New MyWindow App.Run() End Function

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Class MyWindow Extends Window Field myscene:Scene Field mycamera:Camera Field mylight:Light Field ship:Model Field yawEntity:Entity Field pitchEntity:Entity   Method New( title:String="Simple mojo app",width:Int=640,height:Int=480,flags:WindowFlags=WindowFlags.Resizable )   Super.New( title,width,height,flags ) ' Get the current scene myscene=Scene.GetCurrent() 'create camera ' mycamera = New Camera mycamera.Viewport=Rect mycamera.Near = 1 '?? mycamera.Far = 1000 'how far should we render mycamera.FOV = 60 'create light ' mylight = New Light mylight.RotateX(Pi/2) 'aim directional light 'down' - Pi/2=90 degrees.   ship=Model.Load( "asset::test2.gltf" ) Assert(ship) ship.Mesh.FitVertices(New Boxf(1,1),False) mycamera.Move(0,10,25) 'move the camera to position x,y,z mycamera.PointAt(ship) 'ship = Model.Load( "asset::test.gltf" ) yawEntity = New Entity pitchEntity = New Entity pitchEntity.Parent = yawEntity mycamera.Parent = pitchEntity End Method ' This method is the main loop. Method OnRender( canvas:Canvas ) Override RequestRender() myscene.Update() UpdateInput() mycamera.Render( canvas ) 'myscene.Render( canvas,mycamera ) 'render the 3d scene If Keyboard.KeyReleased(Key.Escape) Then App.Terminate() canvas.DrawText("FPS = " + App.FPS,0,0) End Method   End Class   Function Main()   New AppInstance New MyWindow App.Run() End Function

[Mark SiblyKeymaster]

It’s missing the #imports at the top! Please post again…

[swipisParticipant]

ohh sorry, here is full code

Monkey

Namespace test3 #Import "<std>" #Import "<mojo>" #Import "<mojo3d>" #Import "assets/" Using std.. Using mojo.. Using mojo3d.. 'The new mojo 3d module. Class MyWindow Extends Window ' What are we going to use. Field myscene:Scene Field mycamera:Camera Field mylight:Light Field ship:Model Field yawEntity:Entity Field pitchEntity:Entity Method New( title:String="Simple mojo app",width:Int=640,height:Int=480,flags:WindowFlags=WindowFlags.Resizable ) Super.New( title,width,height,flags ) ' Get the current scene myscene=Scene.GetCurrent() 'create camera ' mycamera = New Camera mycamera.Viewport=Rect mycamera.Near = 1 '?? mycamera.Far = 1000 'how far should we render mycamera.FOV = 60 'create light ' mylight = New Light mylight.RotateX(Pi/2) 'aim directional light 'down' - Pi/2=90 degrees. ship=Model.Load( "asset::test2.gltf" ) Assert( ship ) ship.Mesh.FitVertices(New Boxf(1,1),False) mycamera.Move(0,10,250) 'move the camera to position x,y,z mycamera.PointAt(ship) 'ship = Model.Load( "asset::test.gltf" ) yawEntity = New Entity pitchEntity = New Entity pitchEntity.Parent = yawEntity mycamera.Parent = pitchEntity 'testing FMOD function (METHOD) End Method ' This method is the main loop. Method OnRender( canvas:Canvas ) Override RequestRender() myscene.Update() UpdateInput() 'mybox.Rotate(3,3,3) 'rotate the box (x,y,z) mycamera.Render( canvas ) 'myscene.Render( canvas,mycamera ) 'render the 3d scene If Keyboard.KeyReleased(Key.Escape) Then App.Terminate() canvas.DrawText("FPS = " + App.FPS,0,0) End Method Method UpdateInput() Local mousePos:Vec2f = Mouse.Location mousePosDelta.x = mousePos.x - previousMousePos.x mousePosDelta.y = mousePos.y - previousMousePos.y previousMousePos = mousePos 'Print mousePosDelta.x + " -- " + mousePos.x If Mouse.ButtonDown(MouseButton.Right) Then 'Local yaw:Float = mousePosDelta.x 'Local pitch:Float = mousePosDelta.y Print mousePosDelta.x 'Mouse.PointerVisible = False mouseX = Mouse.X 'FMOD(pitch - mouseX * 0.3 * 0.05, 360) 'yaw = FMOD(yaw - mouseX * 0.3 * 0.05, 360) 'pitch = pitch * (Pi/180) 'Print FMOD(pitch - Mouse.X * 0.05, 360) + " -- " + RAD2DEG(pitch) yawEntity.Rotate(0,yaw,0) 'pitchEntity.Rotate(-pitch,0,0) mousePosDelta = New Vec2f(0) mouseX = 0 Endif End Method Method FMOD:Float(x:Float, y:Float) Local d:Float d = x / y d = Floor(d) 'd = Round(d) d = d * y d = x - d Return d End Method Method DEG2RAD:Float (r:Float) r = (r * Pi) / 180 Return r End Method Method RAD2DEG:Float (r:Float) r = (r * 180) / Pi Return r End Method End Class Function Main() New AppInstance New MyWindow App.Run() End Function

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Namespace test3 #Import "<std>" #Import "<mojo>" #Import "<mojo3d>"   #Import "assets/"   Using std.. Using mojo.. Using mojo3d.. 'The new mojo 3d module.   Class MyWindow Extends Window ' What are we going to use. Field myscene:Scene Field mycamera:Camera Field mylight:Light Field ship:Model Field yawEntity:Entity Field pitchEntity:Entity   Method New( title:String="Simple mojo app",width:Int=640,height:Int=480,flags:WindowFlags=WindowFlags.Resizable )   Super.New( title,width,height,flags ) ' Get the current scene myscene=Scene.GetCurrent() 'create camera ' mycamera = New Camera mycamera.Viewport=Rect mycamera.Near = 1 '?? mycamera.Far = 1000 'how far should we render mycamera.FOV = 60 'create light ' mylight = New Light mylight.RotateX(Pi/2) 'aim directional light 'down' - Pi/2=90 degrees.   ship=Model.Load( "asset::test2.gltf" ) Assert( ship ) ship.Mesh.FitVertices(New Boxf(1,1),False) mycamera.Move(0,10,250) 'move the camera to position x,y,z mycamera.PointAt(ship) 'ship = Model.Load( "asset::test.gltf" ) yawEntity = New Entity pitchEntity = New Entity pitchEntity.Parent = yawEntity mycamera.Parent = pitchEntity 'testing FMOD function (METHOD) End Method ' This method is the main loop. Method OnRender( canvas:Canvas ) Override RequestRender() myscene.Update() UpdateInput() 'mybox.Rotate(3,3,3) 'rotate the box (x,y,z) mycamera.Render( canvas ) 'myscene.Render( canvas,mycamera ) 'render the 3d scene If Keyboard.KeyReleased(Key.Escape) Then App.Terminate() canvas.DrawText("FPS = " + App.FPS,0,0) End Method Method UpdateInput() Local mousePos:Vec2f = Mouse.Location mousePosDelta.x = mousePos.x - previousMousePos.x mousePosDelta.y = mousePos.y - previousMousePos.y previousMousePos = mousePos 'Print mousePosDelta.x + " -- " + mousePos.x If Mouse.ButtonDown(MouseButton.Right) Then 'Local yaw:Float = mousePosDelta.x 'Local pitch:Float = mousePosDelta.y Print mousePosDelta.x 'Mouse.PointerVisible = False mouseX = Mouse.X 'FMOD(pitch - mouseX * 0.3 * 0.05, 360) 'yaw = FMOD(yaw - mouseX * 0.3 * 0.05, 360) 'pitch = pitch * (Pi/180) 'Print FMOD(pitch - Mouse.X * 0.05, 360) + " -- " + RAD2DEG(pitch) yawEntity.Rotate(0,yaw,0) 'pitchEntity.Rotate(-pitch,0,0) mousePosDelta = New Vec2f(0) mouseX = 0 Endif End Method Method FMOD:Float(x:Float, y:Float) Local d:Float d = x / y d = Floor(d) 'd = Round(d) d = d * y d = x - d Return d End Method Method DEG2RAD:Float (r:Float) r = (r * Pi) / 180 Return r End Method Method RAD2DEG:Float (r:Float) r = (r * 180) / Pi Return r End Method   End Class   Function Main()   New AppInstance New MyWindow App.Run() End Function

[Mark SiblyKeymaster]

ship.Mesh.FitVertices(New Boxf(1,1),False)

This looks wrong. New Boxf( 1,1 ) will create a 0 volume box as min and max are both 1. Try New Boxf( -1,1 ) instead.

[swipisParticipant]

OK now my model is on the screen thank you!

[Author]

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