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Picking problem

4 posts in this topic

I am using this code:

[CODE]bool IsPicked()
BOOL pickedtmp;
//getting location of mouse relative to game window, not whole screen
POINT ptCursor;
GetCursorPos( &ptCursor );
ScreenToClient( hwnd, &ptCursor );
//getting viewport (p_Device is LPDIRECT3DDEVICE9)
m_D3D::GetDevice()->GetViewport( &view );
//getting projection matrix
//calculating.. mouse ray
float vx = (+2.0f*ptCursor.x/view.Width - 1.0f)/projMat._11;
float vy = (-2.0f*ptCursor.y/view.Height + 1.0f)/projMat._22;
//Vector is D3DVECTOR
D3DXVECTOR3 Origin(0.0f, 0.0f, 0.0f);
// I used Z as my UP VECTOR, not sure how it will work for you
D3DXVECTOR3 Direction(vx, vy, 1.0f);
//getting projection matrix
//inversing projection matrix
D3DXMATRIX iviewMat;
D3DXMatrixInverse(&iviewMat, 0, &viewMat);
D3DXVec3TransformCoord(&Origin, &Origin, &iviewMat);
D3DXVec3TransformNormal(&Direction, &Direction, &iviewMat);
//setting variables
DWORD dwFace;
FLOAT fBary1, fBary2, fDist;

D3DXIntersect( g_Mesh, &Origin, &Direction, &pickedtmp, &dwFace, &fBary1, &fBary2, &fDist, NULL, NULL );

return pickedtmp;

it works, but in this situation, i have two mesh:

Now, when I click on the light, the mesh picked is first the street, and if I click again the light.
I want pick only the Light, because it is before.
Sorry, for my English.
It isn't my language Edited by MefistoManna

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Hello mefistomanna,

Try clicking at other places of the screen(near light) if light gets selected at some other point then i think you have to tune your origin and direction vectors.

And also have a look at this http://toymaker.info/Games/html/picking.html.

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Thx Sesha,
If I click in one place where there isn't the street behind, the light select correctly, else the selected mesh is light, street, light, street...
I don't know if I was clear. Edited by MefistoManna

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use the distance you want the object nearest the viewer.[img]http://public.gamedev.net//public/style_emoticons/default/rolleyes.gif[/img]

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