screen coords to world ::?

Graphics and GPU Programming Programming

Started by be17_17y July 20, 2005 05:59 AM

3 comments, last by Endurion 18 years, 9 months ago

128

Author

July 20, 2005 05:59 AM

hallo,sorry...i guess somebody have been post this question before but i can't find it, how do i get world coordinates from screen coordinates...? for mouse

Specchum

242

July 20, 2005 06:07 AM

Use the D3DXVec3Transform(D3DXVECTOR4 *pOut, CONST D3DXVECTOR3 *pV, CONST D3DXMATRIX *pM) function (copied straight from the docs :) ).

Supply your screen x,y,z as a vector pV and the world matrix as pM. You will get the transformed co-ords in pOut as a vector.

"There is no dark side of the moon." - Pink Floyd

Anonymous

July 20, 2005 06:11 AM

Do notice however, that you can't get a xyz world point from a xy screen point. Instead, you will get a line

be17_17y

128

Author

July 20, 2005 06:26 AM

posted by Anonymous :
Do notice however, that you can't get a xyz world point from a xy screen point. Instead, you will get a line

what do you mean get a line ?, i dont understand...:) sorry...
actually i want to make my mouse cursor move along terrain map... like...warcraft3...maybe...
help me....
:)
thanks