Irrlicht Engine

i hope do something in displaying 3ds models,then explore them,
but the os is wince,no hardware booster. the performance is not well,what i want to know is how to improve the performance ,including reading model files,rendering ,this is debugger information about the time to read model and render it ...

all have done

error LNK2019: unresolved external symbol "public: void __thiscall irr::scene::CBeamSceneNode::setLine(class irr::core::vector3d<float>,class irr::core::vector3d<float>,float)" (?setLine@CBeamSceneNode@scene@irr@@QAEXV?$vector3d@M@core@3@0M@Z) referenced in function _main

how to use this class ?
like this
scene::CBeamSceneNode* beam = new scene::CBeamNode(parent, smgr, -1, "The texture the beam should have when looking at it from the side , "The texture when looking at the cap" );

//now set the beam
beam->setLine(core::vector3df(0,0,0), core::vector3df(10,10,10 ...

i'll try kvakvs's method , wish to be settled

how to settle the problem ?

and set the width only works in opengl mode,really?

thank u,it works,but anothor question,when i set the value parameter"Thickness",it looks like cannot draw very big width,set 8.0f and 20.0f the effort like the same width.

anybody know question?

thanks for your relpy,i assure the obj file is right because it can work in the old edition 1.5

platform wince,irrlicht edition 1.7.1
the program cannot run because the error"Could not load mesh, file format seems to be unsupported",

scene::IAnimatedMesh* mesh = smgr->getMesh("sdmmc/3d/media/0100001_3D_M.obj");

smgr->getMeshManipulator()->makePlanarTextureMapping(mesh->getMesh(0), 0.004f ...

anybody know how?

i modified the coordinate so that it can display on screen

while(device->run())
{
driver->beginScene(true, true, SColor(255,100,101,140));
smgr->drawAll();
guienv->drawAll();
SMaterial mat;
mat.Thickness = 100;
mat.AntiAliasing=true;
mat.Lighting = false;
driver->setMaterial(mat);

driver->draw3DLine(core::vector3df(2.0,3.0,4.0),core::vector3df ...

thanks for your help.but it doesn't work