PureBasic Forums - English

Posted: **Wed Mar 21, 2012 10:39 pm**

Is there a way to tell Ogre to not rotate cameras when there is no explicit command for it?

This tip shows that a generic created Ogre camera automatically turns 180º over its own Z axis everywhen it is being "forced" to invert the 'world' floor (ie. the XZ plane).
In other words:
When you record video with your real cam in your real world, you can turn 180º your cam and the world you get is a 180º rotated world.
Well, the Ogre cameras just seem to not be able to see a 180º rotated world, that's all.
And that is definitely not a good for serious purposes in 3D, that behaviour is undesirable under certain serious 3D stuff.

Check the code please, it is ilustrative.

Code: Select all

;This tip shows that a generic created Ogre camera automatically turns 180º over its own Z axis everywhen it is being "forced" to invert the world floor (ie. the XZ plane)
;At the main loop, probe yourself to test only one of the 3 Macros below
;Tip made 20120318 For PB4.60 by Psychophanta

InitEngine3D():InitSprite():InitKeyboard():InitMouse()
ExamineDesktops()
bitplanes.b=DesktopDepth(0):RX.w=DesktopWidth(0):RY.w=DesktopHeight(0)
scr.l=OpenScreen(RX.w,RY.w,bitplanes.b,"CameraLookAtBug")
Add3DArchive("..\sources\",#PB_3DArchive_FileSystem)
CreateCube(0,40)
UsePNGImageDecoder():LoadTexture(0,"PureBasicLogoNew.png"); <- Use any squared picture (64x64, 128x128, 256x256, 512x512...)
CreateMaterial(0,TextureID(0)) ; Material
CreateEntity(0,MeshID(0),MaterialID(0),0,0,0)
CreateCamera(0,0,0,100,100)
AmbientColor($fafafa); <- Essential for clarity
Macro TurnCameraOverXaxis
  CamLocateX.f=0:CamLocateY.f=0:CamLocateZ.f=100:CamLocateDistance.f=100; <- start looking at the body from back (100 units lenght from XY plane, ie. display monitor surface plane)
  CamAngleX.f+MouseDeltaY()/600
  CamLocateY.f=CamLocateDistance.f*Sin(CamAngleX)
  CamLocateZ.f=CamLocateDistance.f*Cos(CamAngleX)-MouseWheel()*4
EndMacro
Macro TurnCameraOverYaxis
  CamLocateX.f=0:CamLocateY.f=0:CamLocateZ.f=100:CamLocateDistance.f=100; <- start looking at the body from back (100 units lenght from XY plane, ie. display monitor surface plane)
  CamAngleY.f+MouseDeltaX()/600
  CamLocateX.f=CamLocateDistance.f*Sin(CamAngleY)
  CamLocateZ.f=CamLocateDistance.f*Cos(CamAngleY)-MouseWheel()*4
EndMacro
Macro TurnCameraOverZaxis
  CamLocateX.f=0:CamLocateY.f=-100:CamLocateZ.f=0:CamLocateDistance.f=100; <- start looking at the body from upside
  CamAngleZ.f+MouseDeltaX()/600
  CamLocateX.f=CamLocateDistance.f*Sin(CamAngleZ)
  CamLocateY.f=CamLocateDistance.f*Cos(CamAngleZ)-MouseWheel()*4
EndMacro
Repeat
  ExamineKeyboard():ExamineMouse()
;   TurnCameraOverXaxis; <- camera does rotate 180º over itself when it surpass the XY plane
;   TurnCameraOverYaxis; <- the only one in which the camera do not rotate over itself
  TurnCameraOverZaxis; <- camera does rotate 180º over itself when it surpass the YZ plane
  CameraLocate(0,CamLocateX.f,CamLocateY.f,CamLocateZ.f)
  CameraLookAt(0,0,0,0); <- this function does rotate camera over its own z axis, why?
  RenderWorld()
  FlipBuffers():Delay(3)
Until KeyboardPushed(#PB_Key_Escape)

Posted: **Sat Mar 24, 2012 10:49 am**

When i understand you right, the real problem for you is CameraLookAt().
Well, if you don't like the behaviour of CameraLookAt(), don't use it.

You can rotate the camera by yourself with CameraRotate().

MFG PMV

Posted: **Sat Mar 24, 2012 11:48 am**

PMV wrote:When i understand you right, the real problem for you is CameraLookAt().
Well, if you don't like the behaviour of CameraLookAt(), don't use it.

You can rotate the camera by yourself with CameraRotate().

MFG PMV

Nope, you have not understood

Posted: **Tue Mar 27, 2012 9:56 am**

You surely get more attention (and less wrong answers) if you make your example Copy&Paste&Run-Ready.
Changing those three lines of code e.g.:

Code: Select all

Add3DArchive(#PB_Compiler_Home + "Examples\Sources\Data\", #PB_3DArchive_FileSystem)
CreateCube(0, 40)
LoadTexture(0, "Geebee2.bmp")

You know, the world is full of lazy guys

Posted: **Tue Mar 27, 2012 7:08 pm**

Just by the way ... my answer wasn't wrong.
After he answered i have tested his sniped to
get, what he means ... of course he means the
functionality of CameraLookAt() ... but i have
no time and tendency to make a working
example with a self-made CameraLookAt().

OGRE3D is able to show a 180° rotated world,
CameraLookAt() is not designed for his sniped.

MFG PMV

Posted: **Tue Mar 27, 2012 8:07 pm**

@PMV, RotateCamera() does not work properly

PB's ogre implementation is a Pure CRAP!
I forgot it definitely and returned to Dreamotion3D ver 5 (btw, much faster than any version of N3xtD)

Posted: **Tue Mar 27, 2012 11:10 pm**

RotateCamera() is one of the few commands, where i have no problems with

But yes ... it has many bugs and all of them are readable in the bug-forum

Still not usefull for serious projects, even though the 3D part is going into the right
direction. I have managed to get a working game-engine with PureBasic and OGRE3D,
but it is still massive limited by the possibilities. I have to change the 3D engine if it
will not get better with the next release ... and of course i don't expect an update
there.

PureBasic Forums - English

Automatically rotate the camera when there is not a command

Automatically rotate the camera when there is not a command

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Re: Automatically rotate the camera when there is not a comm

Re: Automatically rotate the camera when there is not a comm

Re: Automatically rotate the camera when there is not a comm

Re: Automatically rotate the camera when there is not a comm