PureBasic Forums - English

Posted: **Sat Feb 23, 2013 6:28 am**

Concerning the new x,y,z positions of the mesh:

Using 'x' as an example
In the parameters list, Doc says "New 'x' position of the mesh, relative to its node"

If the mesh is not a member of an Entity and the Entity is not attached to a node, it should say:
"New absolute (world) 'x' position of the mesh"

The conumdrum is - should a mesh be transformed once it is a member of an Entity, which in turn is a member of a Node?

If the Node is specifically for the one Entity, then the Node can be transformed, else the Entity can be transformed.

Posted: **Sat Feb 23, 2013 9:31 am**

IdeasVacuum , look the following example about TransFormMesh, which i have posted before. since there is no TransFormMesh keyword inside 3D examples.
when you press arrow keys you can detach a triangle and moving it away from the mesh. but i can't decide if the scalex,scaley,scalez and rotatex,rotatey,rotatez are working okay or not.
save the example to 3D folder:

Code: Select all

Declare CreateFigure_(FigNum, size)
#Win=8
#node=9
EnableExplicit
Define Mat2,rot,xx.f,yy.f,zz.f,yyy.l,ss.s,k.l,Event.l
InitEngine3D()
InitSprite()
InitKeyboard()
Add3DArchive("Data/Textures", #PB_3DArchive_FileSystem)
;oooooooooooooooooooooooooooooooooooooooooooooooooooooooo
OpenWindow(#Win,0,0,640,480,"Use arrow keys to detach a triangle",#PB_Window_SystemMenu | #PB_Window_ScreenCentered)
OpenWindowedScreen(WindowID(#Win),0,0,640,400,1,0,0)
CreateCamera(0, 0, 0, 100, 100)
MoveCamera(0,0,0,300)
CameraLookAt(0, 0,0, 0)
CameraBackColor(0,0)
CreateLight(1,RGB(255,255,255),0,0,0)
Mat2=CreateMaterial(0, LoadTexture(0, "ValetCoeur.jpg"))
MaterialCullingMode(0, 1)
CreateFigure_(1,150)
CreateEntity(1,MeshID(1),Mat2,400,-350,0) 
CreateNode(#node , 0, 0, 0)

AttachNodeObject(#node, EntityID(1))
;TransformMesh(#Mesh, x, y, z, ScaleX, ScaleY, ScaleZ, RotateX, RotateY, RotateZ [, SubMesh])

Repeat
  Event = WindowEvent()
  zz=0:xx=0
  ExamineKeyboard()
  yyy+1
  RotateNode(#node, 0, rot, 0 )
  rot+1  :  If rot>360 :rot= 1 :EndIf
  RenderWorld()
  FlipBuffers()

  If KeyboardPushed(#PB_Key_Up)
    zz=zz-2
    TransformMesh(1, xx, yy, zz, 1, 1, 1, 0, 0, 0 , 2)
       
  ElseIf KeyboardPushed(#PB_Key_Down)
    zz=zz+2
    TransformMesh(1, xx, yy, zz, 1, 1, 1, 0, 0, 0 , 2)
        
  
  ElseIf KeyboardPushed(#PB_Key_Right)
    xx+2
    TransformMesh(1, xx, yy, zz, 1, 1, 1, 0, 0, 0 , 2)
      
  ElseIf KeyboardPushed(#PB_Key_Left)
    xx-2
    TransformMesh(1, xx, yy, zz, 1, 1, 1, 0, 0, 0 , 2)
        
  EndIf
  
Until KeyboardPushed(#PB_Key_Escape) Or Event = #PB_Event_CloseWindow

Procedure CreateFigure_(FigNum, Size)
  Protected.l i,r
  Protected.f x, y, z,u, v
  Protected.w t1, t2, t3
  CreateMesh(FigNum,#PB_Mesh_TriangleList,#True)
  r=0
  AddSubMesh()
  For i=0 To 11
    ;note that backside vertices begins with v12
    r=r+1
    If r=4
      r=1
      AddSubMesh()
    EndIf  
    Read.f x : Read.f y : Read.f z
    Read.f u: Read.f v
    MeshVertexPosition(x * size, y * Size, z * Size)
    MeshVertexTextureCoordinate(u, v)
    ;;wwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwww
    
  Next i
  Restore Triangles
  For i=0 To 3
    Read.w t1 : Read.w t2 : Read.w t3
    MeshFace(t1, t2, t3)
  Next i
  FinishMesh(#True)
  
EndProcedure


DataSection
  
  Vertices:  
  Data.f -2.5, 2.5 ,0,    1,0.5
  Data.f -2.5, 3   ,0,    1,0 
  Data.f -3,   3   ,0,     0,0
  
  Data.f -3,   3   ,0,     0,0
  Data.f -3,   2.5 ,0,     0,0.5
  Data.f -2.5, 2.5 ,0,     1,0.5
  
  
  Data.f -2.5, 2   ,0,     1,1
  Data.f -2.5, 2.5 ,0,     1,0.5
  Data.f -3,   2.5 ,0,     0,0.5
  Data.f -3,   2.5 ,0,     0,0.5
  Data.f -3,   2   ,0,     0,1
  Data.f -2.5, 2   ,0,     1,1
  
    
  Triangles:
  Data.w 0,1,2
  Data.w 3,4,5
  Data.w 6,7,8
  Data.w 9,10,11
  
      
EndDataSection

Posted: **Sat Feb 23, 2013 5:19 pm**

Hi ApplePi

....you have gone off topic a bit there

This post is about the documentation. For the record, in addition to the existing Move, Scale and Rotate commands for Entities and Nodes, I think it would be good to have a transform command for each, yeilding more elegant code - but of course we can set that up as a procedure.

Currently, the Documentation assumes that the Mesh to be Transformed is a member of an Entity which is attached to a node. However a Transform can be performed on a Mesh whether or not it has a Parent and/or Grandparent

and there are advantages in applying a Transform before it is logically linked, for example if it is to be instanced many times. You might use a transform to turn a Cube primative into a rectangular block (prism).

PureBasic Forums - English

Documentation: TransFormMesh() not right?

Documentation: TransFormMesh() not right?

Re: Documentation: TransFormMesh() not right?

Re: Documentation: TransFormMesh() not right?