mojo3d physics… why am I not colliding?

[DruggedBunnyParticipant]

I’m sure I ran into this months ago, but can’t find any trace of it!

The box and ground here don’t collide, though both have default collision group and mask of 1.

See Class PhysBox and CreateArena (“gb = New PhysBox” creates ground).

I’m unsure if I’m missing something, or if it was some kind of timing thing causing the collision to go undetected.

Would really like to see some kind of wrapper for this stuff, which is obviously what I was attempting here…

Also, how do the collision groups/masks work? Using mojo3d\tests\shapes.monkey2 I see CollisionMask is always 127, though these values default to 1 in the definition of New RigidBody (entity).

Something like cubes with collision group 1, spheres with collision group 2, and masks for both being (1 + 2) = 3 would mean cubes and spheres collide, something like that?

Should both values being 1 for ground and box cause collision here?

Monkey

#Import "<std>" #Import "<mojo>" #Import "<mojo3d>" Using std.. Using mojo.. Using mojo3d.. Class PhysBox Field box:Boxf Field model:Model Field collider:BoxCollider Field body:RigidBody Method New (width:Float = 1, height:Float = 1, depth:Float = 1, mass:Float = 1, material:Material = Null, group:Int = 1, mask:Int = 1) box = New Boxf (-width * 0.5, height * 0.5, depth * 0.5, width * 0.5, -height * 0.5, -depth * 0.5) If Not material material = New PbrMaterial (Color.Red) Endif model = Model.CreateBox (box, 8, 8, 8, material) collider = New BoxCollider (model) collider.Box = box body = New RigidBody (model) body.Mass = mass body.CollisionGroup = group body.CollisionMask = mask End Method Move (x:Float, y:Float, z:Float) model.Move (x, y, z) End End Class Game Extends Window Const CAMERA_MOVE:Float = 0.05 Const SHIFT_BOOST:Float = 4.0 Field cam_boost:Float = 1.0 Field scene:Scene Field cam:Camera Field light:Light Field light_model:Model Field ground:Model Field ground_pixels:Pixmap Field heightmap:Pixmap Field terrain_material:PbrMaterial Field gb:PhysBox Field pb:PhysBox Method New (title:String, width:Int, height:Int, flags:WindowFlags) Super.New (title, width, height, flags) CreateArena () pb = New PhysBox () pb.Move (0, 10, 5) End Method CreateArena:Void () cam = New Camera cam.Near = 0.01 cam.Far = 1000 light = New Light light.CastsShadow = True light.Range = 1000 light.Move (0, 50, 10) ' Yes, the sun is 50m above us... light_model = Model.CreateSphere (1, 32, 32, New PbrMaterial (Color.Yellow), light) light_model.CastsShadow = False ground_pixels = New Pixmap (256, 256, PixelFormat.RGBA8) ground_pixels.Clear (Color.Grey) Local pixel_toggle:Int = 0 For Local gp_y:Int = 0 Until ground_pixels.Height For Local gp_x:Int = 0 Until ground_pixels.Width If pixel_toggle Then ground_pixels.SetPixel (gp_x, gp_y, Color.White) pixel_toggle = 1 - pixel_toggle Next pixel_toggle = 1 - pixel_toggle Next #rem heightmap = New Pixmap (4, 4, PixelFormat.RGBA8) heightmap.Clear (Color.Black) terrain_material = New PbrMaterial () terrain_material.ColorTexture = New Texture (ground_pixels, TextureFlags.None) ground = Model.CreateTerrain (heightmap, New Boxf (-256, 0, -256, 256, 0, 256), terrain_material) ground.Move (0, -2, 0) light.PointAt (ground) #end gb = New PhysBox (100, 1, 100, 0, New PbrMaterial (Color.Green)) gb.Move (0, -5, 0) light.PointAt (gb.model) scene = Scene.GetCurrent () scene.AmbientLight = Color.White * 0.75 scene.ClearColor = Color.Sky * 0.75 End Method UpdateGame () If Keyboard.KeyHit (Key.Escape) App.Terminate () Endif If Keyboard.KeyDown (Key.LeftShift) cam_boost = SHIFT_BOOST Else cam_boost = 1.0 Endif If Keyboard.KeyDown (Key.A) cam.Move (0.0, 0.0, CAMERA_MOVE * cam_boost) Endif If Keyboard.KeyDown (Key.Z) cam.Move (0.0, 0.0, -CAMERA_MOVE * cam_boost) Endif If Keyboard.KeyDown (Key.Left) cam.Rotate (0.0, 1.0, 0.0) Endif If Keyboard.KeyDown (Key.Right) cam.Rotate (0.0, -1.0, 0.0) Endif If Keyboard.KeyDown (Key.Up) cam.Rotate (1.0, 0.0, 0.0, True) Endif If Keyboard.KeyDown (Key.Down) cam.Rotate (-1.0, 0.0, 0.0, True) Endif End Method ShadowText:Void (canvas:Canvas, s:String, x:Float, y:Float) canvas.Color = Color.Black canvas.DrawText (s, x + 1, y + 1) canvas.Color = Color.White canvas.DrawText (s, x, y) End Method RenderText (canvas:Canvas) ShadowText (canvas, "FPS: " + App.FPS, 20.0, 20.0) ShadowText (canvas, "A/Z + Cursors to move camera", 20.0, 60.0) End Method OnRender (canvas:Canvas) Override UpdateGame () RequestRender () scene.Update () scene.Render (canvas, cam) RenderText (canvas) End End Function Run3D (title:String, width:Int, height:Int, flags:WindowFlags = WindowFlags.Center) New AppInstance New Game (title, width, height, flags) App.Run () End Function Main () Run3D ("3D Scene", 640, 480, WindowFlags.Center) ' Run3D ("3D Scene", 1920, 1080, WindowFlags.Fullscreen) End

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#Import "<std>" #Import "<mojo>" #Import "<mojo3d>"   Using std.. Using mojo.. Using mojo3d..   Class PhysBox   Field box:Boxf Field model:Model Field collider:BoxCollider Field body:RigidBody   Method New (width:Float = 1, height:Float = 1, depth:Float = 1, mass:Float = 1, material:Material = Null, group:Int = 1, mask:Int = 1)   box = New Boxf (-width * 0.5, height * 0.5, depth * 0.5, width * 0.5, -height * 0.5, -depth * 0.5)   If Not material material = New PbrMaterial (Color.Red) Endif model = Model.CreateBox (box, 8, 8, 8, material)   collider = New BoxCollider (model)   collider.Box = box   body = New RigidBody (model)   body.Mass = mass body.CollisionGroup = group body.CollisionMask = mask   End   Method Move (x:Float, y:Float, z:Float) model.Move (x, y, z) End End   Class Game Extends Window   Const CAMERA_MOVE:Float = 0.05 Const SHIFT_BOOST:Float = 4.0 Field cam_boost:Float = 1.0 Field scene:Scene Field cam:Camera   Field light:Light Field light_model:Model Field ground:Model Field ground_pixels:Pixmap Field heightmap:Pixmap Field terrain_material:PbrMaterial Field gb:PhysBox Field pb:PhysBox Method New (title:String, width:Int, height:Int, flags:WindowFlags)   Super.New (title, width, height, flags)   CreateArena () pb = New PhysBox () pb.Move (0, 10, 5) End Method CreateArena:Void () cam = New Camera   cam.Near = 0.01 cam.Far = 1000 light = New Light light.CastsShadow = True light.Range = 1000 light.Move (0, 50, 10) ' Yes, the sun is 50m above us... light_model = Model.CreateSphere (1, 32, 32, New PbrMaterial (Color.Yellow), light)   light_model.CastsShadow = False ground_pixels = New Pixmap (256, 256, PixelFormat.RGBA8) ground_pixels.Clear (Color.Grey) Local pixel_toggle:Int = 0 For Local gp_y:Int = 0 Until ground_pixels.Height For Local gp_x:Int = 0 Until ground_pixels.Width If pixel_toggle Then ground_pixels.SetPixel (gp_x, gp_y, Color.White) pixel_toggle = 1 - pixel_toggle Next pixel_toggle = 1 - pixel_toggle Next   #rem heightmap = New Pixmap (4, 4, PixelFormat.RGBA8)   heightmap.Clear (Color.Black) terrain_material = New PbrMaterial () terrain_material.ColorTexture = New Texture (ground_pixels, TextureFlags.None)   ground = Model.CreateTerrain (heightmap, New Boxf (-256, 0, -256, 256, 0, 256), terrain_material) ground.Move (0, -2, 0) light.PointAt (ground)   #end   gb = New PhysBox (100, 1, 100, 0,  New PbrMaterial (Color.Green))   gb.Move (0, -5, 0)   light.PointAt (gb.model) scene = Scene.GetCurrent () scene.AmbientLight = Color.White * 0.75 scene.ClearColor = Color.Sky * 0.75   End Method UpdateGame () If Keyboard.KeyHit (Key.Escape) App.Terminate () Endif   If Keyboard.KeyDown (Key.LeftShift) cam_boost = SHIFT_BOOST Else cam_boost = 1.0 Endif If Keyboard.KeyDown (Key.A) cam.Move (0.0, 0.0, CAMERA_MOVE * cam_boost) Endif If Keyboard.KeyDown (Key.Z) cam.Move (0.0, 0.0, -CAMERA_MOVE * cam_boost) Endif If Keyboard.KeyDown (Key.Left) cam.Rotate (0.0, 1.0, 0.0) Endif If Keyboard.KeyDown (Key.Right) cam.Rotate (0.0, -1.0, 0.0) Endif If Keyboard.KeyDown (Key.Up) cam.Rotate (1.0, 0.0, 0.0, True) Endif If Keyboard.KeyDown (Key.Down) cam.Rotate (-1.0, 0.0, 0.0, True) Endif   End   Method ShadowText:Void (canvas:Canvas, s:String, x:Float, y:Float) canvas.Color = Color.Black canvas.DrawText (s, x + 1, y + 1) canvas.Color = Color.White canvas.DrawText (s, x, y) End   Method RenderText (canvas:Canvas) ShadowText (canvas, "FPS: " + App.FPS, 20.0, 20.0) ShadowText (canvas, "A/Z + Cursors to move camera", 20.0, 60.0)   End Method OnRender (canvas:Canvas) Override   UpdateGame () RequestRender () scene.Update () scene.Render (canvas, cam)   RenderText (canvas) End End   Function Run3D (title:String, width:Int, height:Int, flags:WindowFlags = WindowFlags.Center)   New AppInstance New Game (title, width, height, flags)   App.Run ()   End   Function Main () Run3D ("3D Scene", 640, 480, WindowFlags.Center) ' Run3D ("3D Scene", 1920, 1080, WindowFlags.Fullscreen) End

[Mark SiblyKeymaster]

Collision groups/masks are just the way bullet does it and I may yet change it for mojo3d.

Both mask and group are just (16 bit) bitmasks, and both (entity1->mask & entity2->group) AND (entity2->mask & entity1->group) must be non-0 for entities to collide. I think – I find it really confusing myself too!

Safest thing to do is just make mask and group the same for all entities (non-0 though), and all entities can then collide. They default to 1 anyway.

This stuff is very much in flux right now, but I am working on it this week/right now.

[DruggedBunnyParticipant]

Thanks, Mark — thy are both 1 at the moment, but aren’t colliding in this demo. Will be playing again tonight though, no doubt.

[DruggedBunnyParticipant]

Sorted this — turned out to be the order in which I was declaring the Boxf parameters at start of PhysBox.New ()!

Was:

Monkey

box = New Boxf (-width * 0.5, height * 0.5, depth * 0.5, width * 0.5, -height * 0.5, -depth * 0.5)

1	box = New Boxf (-width * 0.5, height * 0.5, depth * 0.5, width * 0.5, -height * 0.5, -depth * 0.5)

… but should be:

Monkey

box = New Boxf (-width * 0.5, -height * 0.5, -depth * 0.5, width * 0.5, height * 0.5, depth * 0.5)

1	box = New Boxf (-width * 0.5, -height * 0.5, -depth * 0.5, width * 0.5, height * 0.5, depth * 0.5)

[DruggedBunnyParticipant]

This is pretty cool, but I can’t figure out how to delete/remove RigidBodies… see KeyHit (Key.Space). I’m trying to clear my stack of PhysBoxes (containing RigidBody and Model references), but they always remain! Perhaps not implemented yet? There is code that looks intended to work in RigidBody.OnDestroy…

Monkey

#Import "<std>" #Import "<mojo>" #Import "<mojo3d>" Using std.. Using mojo.. Using mojo3d.. Class PhysBox Field box:Boxf Field model:Model Field collider:BoxCollider Field body:RigidBody Method New (width:Float = 1, height:Float = 1, depth:Float = 1, mass:Float = 1, material:Material = Null, group:Int = 1, mask:Int = 1) If Not material material = New PbrMaterial (Color.Red) Endif box = New Boxf (-width * 0.5, -height * 0.5, -depth * 0.5, width * 0.5, height * 0.5, depth * 0.5) model = Model.CreateBox (box, 8, 8, 8, material) collider = New BoxCollider (model) body = New RigidBody (model) collider.Box = box body.Mass = mass body.CollisionGroup = group body.CollisionMask = mask End Method Move (x:Float, y:Float, z:Float) model.Move (x, y, z) End Method Rotate (pitch:Float, roll:Float, yaw:Float, localspace:Bool = False) model.Rotate (pitch, roll, yaw, localspace) End End Class Game Extends Window Const CAMERA_MOVE:Float = 0.05 Const SHIFT_BOOST:Float = 4.0 Field cam_boost:Float = 1.0 Field scene:Scene Field cam:Camera Field light:Light Field ground:PhysBox Field boxes:Stack <PhysBox> Method New (title:String, width:Int, height:Int, flags:WindowFlags) Super.New (title, width, height, flags) SwapInterval = 1 CreateArena () End Method CreateArena:Void () SeedRnd (Millisecs ()) scene = Scene.GetCurrent () ground = New PhysBox (100, 1, 100, 0, New PbrMaterial (Color.Green * 0.25)) cam = New Camera light = New Light scene.AmbientLight = Color.White * 0.75 scene.ClearColor = Color.Sky * 0.75 cam.FOV = 100 cam.Move (0, 20, -20) ground.Move (0, -5, 0) cam.Near = 0.01 cam.Far = 1000 light.CastsShadow = True light.Range = 1000 light.Move (0, 50, 10) cam.PointAt (ground.model) light.PointAt (ground.model) SpewBoxes (200) End Method SpewBoxes (num:Int) boxes = New Stack <PhysBox> For Local loop:Int = 1 To num Local scale:Float = Rnd (0.5, 4.0) Local color:Color = New Color (Rnd (0.4, 1.0), Rnd (0.4, 1.0), Rnd (0.4, 1.0)) ' Just for clarity in New below... Local dimension:Float = scale Local mass:Float = scale Local pb:PhysBox = New PhysBox (dimension, dimension, dimension, mass, New PbrMaterial (color)) pb.Move (Rnd (-10, 10), Rnd (100), Rnd (-10, 10)) ' *** Set loop to max 1 and enable this -- physics mesh still appears unturned when settled! ' pb.Rotate (45, 45, 45) Next End Method UpdateGame () If Keyboard.KeyHit (Key.Escape) App.Terminate () Endif If Keyboard.KeyHit (Key.S) light.CastsShadow = Not light.CastsShadow Endif If Keyboard.KeyHit (Key.Space) For Local pb:PhysBox = Eachin boxes ' *** HELP! *** ' pb.body.Destroy () ' er, = Null? OnDestroy? Um... ' How about, per http://monkeycoder.co.nz/forums/topic/cast-object-to-int-handle-and-back/#post-10084 pb.model.Destroy () ' Nope, all there! Next boxes.Clear () ' Nah, bodies remain in Bullet! Prob need to destroy entities too... Print boxes.Length SpewBoxes (200) Endif If Keyboard.KeyDown (Key.LeftShift) cam_boost = SHIFT_BOOST Else cam_boost = 1.0 Endif If Keyboard.KeyDown (Key.A) cam.Move (0.0, 0.0, CAMERA_MOVE * cam_boost) Endif If Keyboard.KeyDown (Key.Z) cam.Move (0.0, 0.0, -CAMERA_MOVE * cam_boost) Endif If Keyboard.KeyDown (Key.Left) cam.Rotate (0.0, 1.0, 0.0) Endif If Keyboard.KeyDown (Key.Right) cam.Rotate (0.0, -1.0, 0.0) Endif If Keyboard.KeyDown (Key.Up) cam.Rotate (1.0, 0.0, 0.0, True) Endif If Keyboard.KeyDown (Key.Down) cam.Rotate (-1.0, 0.0, 0.0, True) Endif End Method ShadowText:Void (canvas:Canvas, s:String, x:Float, y:Float) canvas.Color = Color.Black canvas.DrawText (s, x + 1, y + 1) canvas.Color = Color.White canvas.DrawText (s, x, y) End Method RenderText (canvas:Canvas) ShadowText (canvas, "FPS: " + App.FPS, 20.0, 20.0) ShadowText (canvas, "A/Z + Cursors to move camera", 20.0, 40.0) ShadowText (canvas, "SHIFT to boost", 20.0, 60.0) ShadowText (canvas, "SPACE to spew boxes", 20.0, 80.0) ShadowText (canvas, "S to toggle shadows", 20.0, 100.0) End Method OnRender (canvas:Canvas) Override UpdateGame () RequestRender () scene.Update () scene.Render (canvas, cam) RenderText (canvas) End End Function Run3D (title:String, width:Int, height:Int, flags:WindowFlags = WindowFlags.Center) New AppInstance New Game (title, width, height, flags) App.Run () End Function Main () Run3D ("3D Scene", 960, 540, WindowFlags.Center) ' 1/4 HD! ' Run3D ("3D Scene", 1920, 1080, WindowFlags.Fullscreen) End

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#Import "<std>" #Import "<mojo>" #Import "<mojo3d>" Using std.. Using mojo.. Using mojo3d.. Class PhysBox Field box:Boxf Field model:Model Field collider:BoxCollider Field body:RigidBody Method New (width:Float = 1, height:Float = 1, depth:Float = 1, mass:Float = 1, material:Material = Null, group:Int = 1, mask:Int = 1) If Not material material = New PbrMaterial (Color.Red) Endif box = New Boxf (-width * 0.5, -height * 0.5, -depth * 0.5, width * 0.5, height * 0.5, depth * 0.5) model = Model.CreateBox (box, 8, 8, 8, material) collider = New BoxCollider (model) body = New RigidBody (model) collider.Box = box body.Mass = mass body.CollisionGroup = group body.CollisionMask = mask End Method Move (x:Float, y:Float, z:Float) model.Move (x, y, z) End   Method Rotate (pitch:Float, roll:Float, yaw:Float, localspace:Bool = False) model.Rotate (pitch, roll, yaw, localspace) End End Class Game Extends Window Const CAMERA_MOVE:Float = 0.05 Const SHIFT_BOOST:Float = 4.0 Field cam_boost:Float = 1.0 Field scene:Scene Field cam:Camera Field light:Light Field ground:PhysBox   Field boxes:Stack <PhysBox> Method New (title:String, width:Int, height:Int, flags:WindowFlags) Super.New (title, width, height, flags)   SwapInterval = 1 CreateArena () End Method CreateArena:Void ()   SeedRnd (Millisecs ()) scene = Scene.GetCurrent () ground = New PhysBox (100, 1, 100, 0,  New PbrMaterial (Color.Green * 0.25)) cam = New Camera light = New Light scene.AmbientLight = Color.White * 0.75 scene.ClearColor = Color.Sky * 0.75   cam.FOV = 100 cam.Move (0, 20, -20) ground.Move (0, -5, 0)   cam.Near = 0.01 cam.Far = 1000 light.CastsShadow = True light.Range = 1000   light.Move (0, 50, 10) cam.PointAt (ground.model) light.PointAt (ground.model)   SpewBoxes (200) End   Method SpewBoxes (num:Int) boxes = New Stack <PhysBox> For Local loop:Int = 1 To num Local scale:Float = Rnd (0.5, 4.0) Local color:Color = New Color (Rnd (0.4, 1.0), Rnd (0.4, 1.0), Rnd (0.4, 1.0))   ' Just for clarity in New below... Local dimension:Float = scale Local mass:Float = scale Local pb:PhysBox = New PhysBox (dimension, dimension, dimension, mass, New PbrMaterial (color)) pb.Move (Rnd (-10, 10), Rnd (100), Rnd (-10, 10)) ' *** Set loop to max 1 and enable this -- physics mesh still appears unturned when settled! ' pb.Rotate (45, 45, 45) Next End   Method UpdateGame () If Keyboard.KeyHit (Key.Escape) App.Terminate () Endif If Keyboard.KeyHit (Key.S) light.CastsShadow = Not light.CastsShadow Endif If Keyboard.KeyHit (Key.Space) For Local pb:PhysBox = Eachin boxes ' *** HELP! *** ' pb.body.Destroy () ' er, = Null? OnDestroy? Um...   ' How about, per http://monkeycoder.co.nz/forums/topic/cast-object-to-int-handle-and-back/#post-10084 pb.model.Destroy () ' Nope, all there! Next boxes.Clear () ' Nah, bodies remain in Bullet! Prob need to destroy entities too... Print boxes.Length SpewBoxes (200) Endif If Keyboard.KeyDown (Key.LeftShift) cam_boost = SHIFT_BOOST Else cam_boost = 1.0 Endif If Keyboard.KeyDown (Key.A) cam.Move (0.0, 0.0, CAMERA_MOVE * cam_boost) Endif If Keyboard.KeyDown (Key.Z) cam.Move (0.0, 0.0, -CAMERA_MOVE * cam_boost) Endif If Keyboard.KeyDown (Key.Left) cam.Rotate (0.0, 1.0, 0.0) Endif If Keyboard.KeyDown (Key.Right) cam.Rotate (0.0, -1.0, 0.0) Endif If Keyboard.KeyDown (Key.Up) cam.Rotate (1.0, 0.0, 0.0, True) Endif If Keyboard.KeyDown (Key.Down) cam.Rotate (-1.0, 0.0, 0.0, True) Endif End Method ShadowText:Void (canvas:Canvas, s:String, x:Float, y:Float) canvas.Color = Color.Black canvas.DrawText (s, x + 1, y + 1) canvas.Color = Color.White canvas.DrawText (s, x, y) End Method RenderText (canvas:Canvas) ShadowText (canvas, "FPS: " + App.FPS, 20.0, 20.0) ShadowText (canvas, "A/Z + Cursors to move camera", 20.0, 40.0) ShadowText (canvas, "SHIFT to boost", 20.0, 60.0) ShadowText (canvas, "SPACE to spew boxes", 20.0, 80.0) ShadowText (canvas, "S to toggle shadows", 20.0, 100.0) End Method OnRender (canvas:Canvas) Override UpdateGame () RequestRender () scene.Update () scene.Render (canvas, cam) RenderText (canvas) End End Function Run3D (title:String, width:Int, height:Int, flags:WindowFlags = WindowFlags.Center) New AppInstance New Game (title, width, height, flags) App.Run () End Function Main () Run3D ("3D Scene", 960, 540, WindowFlags.Center) ' 1/4 HD! ' Run3D ("3D Scene", 1920, 1080, WindowFlags.Fullscreen) End

Rotation doesn’t work, either, as the RigidBody doesn’t pick up the Model’s rotation, which I suppose it to be expected, though it picks up position. Not sure how this should be handled…

[Author]

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