[D3D9] 'Drawing' into window

James Warner · 2012-03-01T05:58:58

Hi all, Working on a level editor for my engine (still), and I'm at a loss as to how I should go about this next bit. I want to have the user click, drag and release to make a box (which will be turned into a plane - 2D engine). I can't seem to get the mouse coordinates to relate to the position in the 3d view. Heres an image just so you guys can see what I've currently got: Note, it has 3D views because I want this editor to be re-usable in the future. Any help appreciated, Thanks, James Warner

Graphics and GPU Programming Programming

Started by exextatic February 13, 2012 03:41 AM

14 comments, last by exextatic 12 years, 1 month ago

Evil Steve

2,021

February 21, 2012 02:07 PM

I don't have time to look in-depth just now, but I'd suggest printing out the various coordinates fed in and out of your picking code to see why the position is flickering between two locations like that. If you can get it so that it's in one position, that'll make it easier to narrow down. Then, if it's still wrong by a fixed offset, check that the top left coordinate of the viewport is correct, that your input mouse coordinates are relative to the viewport and not in screen space, and so on.

exextatic

111

Author

February 22, 2012 08:25 AM

I don't have time to look in-depth just now, but I'd suggest printing out the various coordinates fed in and out of your picking code to see why the position is flickering between two locations like that. If you can get it so that it's in one position, that'll make it easier to narrow down. Then, if it's still wrong by a fixed offset, check that the top left coordinate of the viewport is correct, that your input mouse coordinates are relative to the viewport and not in screen space, and so on.

Thats made me think, is there a viewport per-swapchain? Im just using GetViewport() to get a viewport, and using that in the D3DXVec3Unproject()
Also, I think I've fixed it from flickering between places (restores the world matrix from when the app started instead of using the current world matrix).
Its still off from the mouse position though.

exextatic

111

Author

February 25, 2012 11:13 PM

Ok, gonna post some more code and upload the latest version for you guys..
Heres the picking code at the moment:</p>

void Editor::addPlane(D3DXVECTOR3 oldMPos, D3DXVECTOR3 oldMDir, string texName, float* texScale, int whichForm)

{

D3DXMATRIX matView, matWorld;

d3ddev->SetTransform(D3DTS_WORLD, &matStart);

matWorld = matStart;



if(whichForm == 0)

{

   fpsCamera->calculateViewMatrix(&matView);

   cameraPos[whichForm] = fpsCamera->getPosition();

   cameraEyePos[whichForm] = fpsCamera->getEyePos();

}

else

{</div>

   D3DXMatrixLookAtLH(&amp;matView,

        &cameraPos[whichForm], 

        &cameraEyePos[whichForm],

        &D3DXVECTOR3 (0.0f, 1.0f, 0.0f));

}

d3ddev->SetTransform(D3DTS_VIEW, &matView);



D3DXMATRIX matProjection; 

D3DXMatrixPerspectiveFovLH(&amp;matProjection,

   D3DXToRadian(45),

   (FLOAT)screenSize[whichForm].x / (FLOAT)screenSize[whichForm].y, 

   1.0f,

   100.0f); 

d3ddev->SetTransform(D3DTS_PROJECTION, &matProjection);



POINT mousePos;

GetCursorPos(&mousePos);



D3DXVECTOR3 mouseOut, mouseOut2;

D3DVIEWPORT9 viewPort;



d3ddev->GetViewport(&viewPort);



ScreenToClient(hWnd[whichForm], &mousePos);



D3DXVec3Unproject(&mouseOut, &D3DXVECTOR3(mousePos.x, mousePos.y, viewPort.MinZ), &viewPort, &matProjection, &matView, &matWorld);

D3DXVec3Unproject(&mouseOut2, &D3DXVECTOR3(mousePos.x, mousePos.y, viewPort.MaxZ), &viewPort, &matProjection, &matView, &matWorld);



float wz = 3.0f;

float wx = ((wz - mouseOut.z) * (mouseOut2.x - mouseOut.x)) / (mouseOut2.z - mouseOut.z) + mouseOut.x;

float wy = ((wz - mouseOut.z) * (mouseOut2.y - mouseOut.y)) / (mouseOut2.z - mouseOut.z) + mouseOut.y;

D3DXVECTOR3 mouseFinal = D3DXVECTOR3(wx, wy, wz);



addPlane(D3DXVECTOR2(mouseFinal.x, mouseFinal.y), D3DXVECTOR2(1.0f, 1.0f), 0.0f, PhysDefinition(NoPhysics, 0.0f, 0.0f, 0.0f), ForeGroundPlane, TextureDefinition(texName, D3DXVECTOR2(texScale[0], texScale[1]), 0.0f));

}