direct3d for world to screen

[mnbvc]

i'm referring to this thread:http://www.mmowned.com/forums/wow-me...ame-world.html

i'm trying to use this for world to screen projection

struct SCameraInfo
{
	DWORD	dwFoo1[2];
	float	fPos[3];
	float	fViewMat[3][3];
	DWORD	dwFoo2[2];
	float	fFov;
};

#define WOW_CAMERA_PTR1		0xB0D578
#define WOW_CAMERA_OFFSET	0x7E24

bool WorldToScreen( float x, float y, float z, POINT *pt )
{
	SCameraInfo cam = read<SCameraInfo>(read<int>(read<int>(WOW_CAMERA_PTR1)+WOW_CAMERA_OFFSET));

	D3DXVECTOR3 Out, In( x, y, z );
	D3DVIEWPORT9 Viewport;
	D3DXMATRIX Proj, View, World;

	float fAspect = ((float)1024) / 768;
	D3DXMatrixPerspectiveFovRH( &Proj, cam.fFov*0.6, fAspect, 1.0f, 10000.0f );

	D3DXVECTOR3 vEyePt( cam.fPos[0], cam.fPos[1], cam.fPos[2] );
	D3DXVECTOR3 vLookatPt( Localplayer.X(), Localplayer.Y(), Localplayer.Z() );
	D3DXVECTOR3 vUpVec( 0.0f, 1.0f, 0.0f );
	D3DXMatrixLookAtRH( &View, &vEyePt, &vLookatPt, &vUpVec );

	m_pDevice->GetViewport(&Viewport);
	D3DXMatrixIdentity(&World);

	D3DXVec3Project( &Out, &In, &Viewport, &Proj, &View, &World );

	pt->x = Out.x;
	pt->y = Out.y;

	return ( Out.z < 1.f );
}

if i draw a rectangle at position of the npcs:


depending on my camera rotation this cluster of rectangles rotates really strange
but i can't what i did wrong, so i hope maybe somebody here does see it

[-Ryuk-]

i'm referring to this thread:http://www.mmowned.com/forums/wow-me...ame-world.html

i'm trying to use this for world to screen projection

struct SCameraInfo
{
	DWORD	dwFoo1[2];
	float	fPos[3];
	float	fViewMat[3][3];
	DWORD	dwFoo2[2];
	float	fFov;
};

#define WOW_CAMERA_PTR1		0xB0D578
#define WOW_CAMERA_OFFSET	0x7E24

bool WorldToScreen( float x, float y, float z, POINT *pt )
{
	SCameraInfo cam = read<SCameraInfo>(read<int>(read<int>(WOW_CAMERA_PTR1)+WOW_CAMERA_OFFSET));

	D3DXVECTOR3 Out, In( x, y, z );
	D3DVIEWPORT9 Viewport;
	D3DXMATRIX Proj, View, World;

	float fAspect = ((float)1024) / 768;
	D3DXMatrixPerspectiveFovRH( &Proj, cam.fFov*0.6, fAspect, 1.0f, 10000.0f );

	D3DXVECTOR3 vEyePt( cam.fPos[0], cam.fPos[1], cam.fPos[2] );
	D3DXVECTOR3 vLookatPt( Localplayer.X(), Localplayer.Y(), Localplayer.Z() );
	D3DXVECTOR3 vUpVec( 0.0f, 1.0f, 0.0f );
	D3DXMatrixLookAtRH( &View, &vEyePt, &vLookatPt, &vUpVec );

	m_pDevice->GetViewport(&Viewport);
	D3DXMatrixIdentity(&World);

	D3DXVec3Project( &Out, &In, &Viewport, &Proj, &View, &World );

	pt->x = Out.x;
	pt->y = Out.y;

	return ( Out.z < 1.f );
}

if i draw a rectangle at position of the npcs:


depending on my camera rotation this cluster of rectangles rotates really strange
but i can't what i did wrong, so i hope maybe somebody here does see it

You need to keep checking every second to see if mobs have moved... Because you only check once... they move... you click and u missed em.

[mnbvc]

don't bother posting if you have nothing useful to say...

[MaiN]

WoW uses the Z axis as the 'up' axis.

[Herleybob]

I'm pretty sure you mis-understood him. What he was saying is that you need to create a loop to always check for the location of the mob. you only checked once and then the mobs moved but the squares didn't.

[mnbvc]

actually i do never check for the position of the npcs in this function because the npc position are the x/y/z values i pass to this function :disbelief:

calling the function with the right parameters and then drawing it is really not my problem...


i tested it with this function i found anywhere here, and everything is fine

BOOL WtS( float x, float y, float z, POINT *pt)
{
	SCameraInfo camera = read<SCameraInfo>(read<int>(read<int>(WOW_CAMERA_PTR1)+WOW_CAMERA_OFFSET));

	RECT rc = {0,0,1024,768};
	
	//CVec3 vDiff = vWoWPos - camera.vPos;
	float fDiff[3];
	fDiff[0] = x-camera.fPos[0];
	fDiff[1] = y-camera.fPos[1];
	fDiff[2] = z-camera.fPos[2];

	//float fProd = vDiff*camera.matView[0];
	float fProd = 
		fDiff[0]*camera.fViewMat[0][0] +
		fDiff[1]*camera.fViewMat[0][1] +
		fDiff[2]*camera.fViewMat[0][2];
	if( fProd < 0 )
		return FALSE;

	//CVec3 vView = vDiff*!camera.matView;
	float fInv[3][3];
	fInv[0][0] = camera.fViewMat[1][1]*camera.fViewMat[2][2]-camera.fViewMat[1][2]*camera.fViewMat[2][1];
	fInv[1][0] = camera.fViewMat[1][2]*camera.fViewMat[2][0]-camera.fViewMat[1][0]*camera.fViewMat[2][2];
	fInv[2][0] = camera.fViewMat[1][0]*camera.fViewMat[2][1]-camera.fViewMat[1][1]*camera.fViewMat[2][0];
	float fDet = camera.fViewMat[0][0]*fInv[0][0]+camera.fViewMat[0][1]*fInv[1][0]+camera.fViewMat[0][2]*fInv[2][0];
	float fInvDet = 1.0f / fDet;
	fInv[0][1] = camera.fViewMat[0][2]*camera.fViewMat[2][1]-camera.fViewMat[0][1]*camera.fViewMat[2][2];
	fInv[0][2] = camera.fViewMat[0][1]*camera.fViewMat[1][2]-camera.fViewMat[0][2]*camera.fViewMat[1][1];
	fInv[1][1] = camera.fViewMat[0][0]*camera.fViewMat[2][2]-camera.fViewMat[0][2]*camera.fViewMat[2][0];
	fInv[1][2] = camera.fViewMat[0][2]*camera.fViewMat[1][0]-camera.fViewMat[0][0]*camera.fViewMat[1][2];
	fInv[2][1] = camera.fViewMat[0][1]*camera.fViewMat[2][0]-camera.fViewMat[0][0]*camera.fViewMat[2][1];
	fInv[2][2] = camera.fViewMat[0][0]*camera.fViewMat[1][1]-camera.fViewMat[0][1]*camera.fViewMat[1][0];
	camera.fViewMat[0][0] = fInv[0][0]*fInvDet;
	camera.fViewMat[0][1] = fInv[0][1]*fInvDet;
	camera.fViewMat[0][2] = fInv[0][2]*fInvDet;
	camera.fViewMat[1][0] = fInv[1][0]*fInvDet;
	camera.fViewMat[1][1] = fInv[1][1]*fInvDet;
	camera.fViewMat[1][2] = fInv[1][2]*fInvDet;
	camera.fViewMat[2][0] = fInv[2][0]*fInvDet;
	camera.fViewMat[2][1] = fInv[2][1]*fInvDet;
	camera.fViewMat[2][2] = fInv[2][2]*fInvDet;
	float fView[3];
	fView[0] = fInv[0][0]*fDiff[0]+fInv[1][0]*fDiff[1]+fInv[2][0]*fDiff[2];
	fView[1] = fInv[0][1]*fDiff[0]+fInv[1][1]*fDiff[1]+fInv[2][1]*fDiff[2];
	fView[2] = fInv[0][2]*fDiff[0]+fInv[1][2]*fDiff[1]+fInv[2][2]*fDiff[2];

	//CVec3 vCam( -vView.fY,-vView.fZ,vView.fX );
	float fCam[3];
	fCam[0] = -fView[1];
	fCam[1] = -fView[2];
	fCam[2] =  fView[0];

	float    fScreenX = (rc.right-rc.left)/2.0f;
	float    fScreenY = (rc.bottom-rc.top)/2.0f;
	// Thanks pat0! Aspect ratio fix
	float    fTmpX    = fScreenX/tan(((camera.fFov*44.0f)/2.0f)*M_DEG2RAD);
	float    fTmpY    = fScreenY/tan(((camera.fFov*35.0f)/2.0f)*M_DEG2RAD);

	POINT pctMouse;
	//pctMouse.x = fScreenX + vCam.fX*fTmpX/vCam.fZ;
	pctMouse.x = fScreenX + fCam[0]*fTmpX/fCam[2];
	//pctMouse.y = fScreenY + vCam.fY*fTmpY/vCam.fZ;
	pctMouse.y = fScreenY + fCam[1]*fTmpY/fCam[2];

	if( pctMouse.x < 0 || pctMouse.y < 0 || pctMouse.x > rc.right || pctMouse.y > rc.bottom )
		return FALSE;

	pt->x = pctMouse.x;
	pt->y = pctMouse.y;

	return TRUE;
}

but now i want to do it using the direct3d stuff because if i want to do what the guy in the other thread did (rendering in wow game world), and there i will need it

WoW uses the Z axis as the 'up' axis.

maybe i understood it wrong: http://www.toymaker.info/Games/html/matrices.html
but this should be solved by using the "righthanded" view und projection matrix creation functions which i'm using

[MaiN]

maybe i understood it wrong: Direct3D Matrices
but this should be solved by using the "righthanded" view und projection matrix creation functions which i'm using

No it shouldn't. WoW still does not use the right handed cartesian coordinate system.

public static Matrix Projection
{
    get
    {
        SSimpleCamera internCam = Camera.InternalCamera;
        return Matrix.PerspectiveFovRH(Camera.FOV * 0.6f, internCam.AspectRatio, internCam.NearZ, internCam.FarZ);
    }
}

public static Matrix View
{
    get
    {
        SSimpleCamera internCam = Camera.InternalCamera;
        WoWPoint eye = internCam.Position;
        WoWPoint at = eye + Camera.Forward;
        return Matrix.LookAtRH(eye, at, new Vector3(0, 0, 1));
    }
}

public static bool WorldToScreen(Vector3 position, out Vector3 screen)
{
    screen = Vector3.Project(position, Endscene.RenderingDevice.Viewport, Projection, View, Matrix.Identity);

    return screen.Z < 1f;
}

Credits to Kynox for lots of the code and the structs.

[mnbvc]

yep, you are right, thank you


here the working code, maybe anybody wants to use it for something :P

#define WOW_CAMERA_PTR1		0xBF2AF8
#define WOW_CAMERA_OFFSET	0x7E24

struct SCameraInfo
{
	DWORD	dwFoo1[2]; // 00
	float	fPos[3]; // 02
	float	fViewMat[3][3]; // 05
	float	zNearPlane; // 14
	float	zFarPlane; // 15
	float	fFov; //16
	float	aspect; // 17
};

LPDIRECT3DDEVICE9 m_pDevice;
D3DVIEWPORT9 Viewport;

void ProjectionMatrix(D3DXMATRIX *Proj)
{
	D3DXMatrixPerspectiveFovRH( Proj, cam->fFov*0.6, cam->aspect, cam->zNearPlane, cam->zFarPlane );
}

void ViewMatrix(D3DXMATRIX *View)
{
	D3DXVECTOR3 vEyePt( cam.fPos[0], cam.fPos[1], cam.fPos[2] );
	D3DXVECTOR3 vLookatPt( cam.fPos[0]+cam.fViewMat[0][0], cam.fPos[1]+cam.fViewMat[0][1], cam.fPos[2]+cam.fViewMat[0][2] );
	D3DXVECTOR3 vUpVec( 0.0f, 0.0f, 1.0f );
	D3DXMatrixLookAtRH( View, &vEyePt, &vLookatPt, &vUpVec );
}

bool WorldToScreen( D3DXVECTOR3 in, D3DXVECTOR3 *out )
{
	cam = read<SCameraInfo>(read<int>(read<int>(WOW_CAMERA_PTR1)+WOW_CAMERA_OFFSET));
	
	m_pDevice->GetViewport(&Viewport);

	D3DXMATRIX Proj, View, World;
	ProjectionMatrix(&Proj);
	ViewMatrix(&View);
	D3DXMatrixIdentity(&World);

	D3DXVec3Project( out, &in, &Viewport, &Proj, &View, &World );

	return ( out->z < 1.f );
}

[Herleybob]

I think ima use this. thanks! I may be contacting you later on...

[mnbvc]

i changed the camera struct und the projectionmatrix function, it wasn't 100% correct

[speedy7]

I wish the CameraInfo would be pure d3d code so we could use this for diablo 3.

[Greedyone]

Hello!
Copypasted Function from Post #6 here, adapted to my Delphi project but i have a problem: Screen X-coordinate returned by this function gives value which is shifted towards centre of the screen. Below you can see screenshots which shows: the closer fishing bobber to the centre of scren by X, the more precise position of red circle.
I can conclude that next part of code is the reason of shift:

// Thanks pat0! Aspect ratio fix
float fTmpX = fScreenX/tan(((camera.fFov*44.0f)/2.0f)*M_DEG2RAD);
float fTmpY = fScreenY/tan(((camera.fFov*35.0f)/2.0f)*M_DEG2RAD);

Where the values 44.0f and 35.0f are taken from?
Do they depends of screen resolution (or from monitor ratio 4:3, 16/9)?


Here is pic with bobber close to the middle:



and here 2 pics with shift:








P.S. My scrren resolution is 1280x1024