World unit ?

[williamvanhoecke]

Hello,
I have a screenwidth() = 500 and a screenheight() = 500
I want to create a mesh with CreateCube(#Mesh, Size) that initialy exactly fits that screen
CreateCube(#Mesh, Size) however uses 'world unit' for setting the size.
Since one does not know many pixels a 'world unit' is. what value should i use for Size

[Caronte3D]

One way, is progressively bring te cube close to the camera until it cover the whole surface, then remember the position to the camera to use it directly.
The other way is to translate the cube wold coordinates to screen space coordinates until it fits (but I don't know if PB have such function).

[pf shadoko]

it depends on the FOV

cameradistance.f=(cubesize/2)/Tan(Radian(FOV/2)) + cubesize/2

Code: Select all

InitEngine3D():InitSprite():InitKeyboard():InitMouse()

ExamineDesktops()
OpenWindow(0, 0,0, 500,500, "",#PB_Window_ScreenCentered)
OpenWindowedScreen(WindowID(0), 0, 0, WindowWidth(0), WindowHeight(0), 0, 0, 0)

CreateCamera(0, 0, 0, 100, 100)
CreateLight(0,$ffffff, 0, 10000, -10000)
AmbientColor($111111*3)
CameraBackColor(0,$444488)

fov.f=45
cubesize.f=10
cameradistance.f=(cubesize/2)/Tan(Radian(fov/2)) + cubesize/2

CameraFOV(0,fov)
CreateCube(0,cubesize);:TransformMesh(0,0,0,0,1,1,0.01,0,0,0)
CreateMaterial(0,0,$ff)
CreateEntity(0,MeshID(0),MaterialID(0))
MoveCamera(0,0,0,-cameradistance):CameraLookAt(0,0,0,0)

Define.f MouseX,Mousey,depx,depz,dist,val,blend

Repeat
	While WindowEvent():Wend
	ExamineKeyboard()
	ExamineMouse()	
	RotateEntity(0,0.2,0.2,0.2, #PB_Relative)
	RenderWorld()
	FlipBuffers()    
Until KeyboardReleased(#PB_Key_Escape) Or MouseButton(3)

[Caronte3D]

it depends on the FOV
cameradistance.f=(cubesize/2)/Tan(Radian(FOV/2)) + cubesize/2

Nice!

[williamvanhoecke]

it depends on the FOV
cameradistance.f=(cubesize/2)/Tan(Radian(FOV/2)) + cubesize/2

Thanks