Problems with draw2DLine and draw3DLine

[bogQ]

Im testing and playing around with lines in 3d space and on screen, and i stumbled on a problem

red line (on first picture) is from draw3DLine
red line is 3D position from camera direction 3d location (camera look@ pos) to 3d object in space and that part is ok

green line is from draw2DLine
green line with screen coordinates starting point (10,1) end point (100,100)

so after i draw gui im draw that 2 lines
first draw3DLine and then draw2DLine


but when draw3DLine + draw2DLine green line with screen coordinates starting point (10,1) end point (100,100) behave similar like 3d space point in draw3DLine.
(first picture)



if i remove draw3DLine leaving only draw2DLine then draw2DLine starts to act like it should on screen coordinates and not as a point in 3D space, so green line is correctly displayed in upper left corner.
(second picture)

so draw3DLine + draw2DLine problem (look at first picture)
if draw2DLine only, no problem (second picture small green line in left upper corner on screen)

Any idea why this is happening?

[CuteAlien]

Please always post your real code with such problems, it's really hard to understand what's going on when someone translates c++ into english first. We read code faster :-)
Do you set the transformation correct before drawing your lines? You need a call like:

Code: Select all

 
driver->setTransform(video::ETS_WORLD, core::IdentityMatrix);
 

[bogQ]

did not know that i need to use it coz when using only draw2DLine it looked ok and did not need setTransform
adding setTransform did correct my lack of knowledge, tu for help CuteAlien