Irrlicht Engine

bur the result is false
so i tried frustum
if(Receiver.leftMouseDown())
{
mouse_up = false;
if(firstCorner == core::position2d<s32>(0,0))
firstCorner = device->getCursorControl()->getPosition();
secondCorner = device->getCursorControl()->getPosition();

}
if(Receiver.leftMouseUp())
{
if ...

if(Receiver.leftMouseDown())
{
if(firstCorner == core::position2d<s32>(0,0))
firstCorner = device->getCursorControl()->getPosition();
secondCorner = device->getCursorControl()->getPosition();

}
if(Receiver.leftMouseUp())
{
length1=0;
core::list<scene::ISceneNode*> sn1 ;
scene ...

i did as you advice me but the result was empty or not complete.
what should i do after
vector2d<irr::s32> screenpos = device->getSceneManager()->getSceneCollisionManager()->getScreenCoordinatesFrom3DPosition(scenNodePos);
is there any transformation i have to do for screenpos ...

core::position2di pos = device->getCursorControl()->getPosition();
device->getSceneManager()->getSceneCollisionManager()->getRayFromScreenCoordinates(pos, camera);

i have do that for every time or only for the left upper corner and right lower corner of rectangle
then loop for all nodes and do the ...

You need to record 2 rays projection to screen coordinate (begin and end) using e.g.

core::position2di pos = device->getCursorControl()->getPosition();
device->getSceneManager()->getSceneCollisionManager()->getRayFromScreenCoordinates(pos, camera);

i have do that for every time or only for the ...

i have a cube ,i put a texture on it, I need this texture to be sometimes visible and invisible in other times (when the texture is invisible,the cube must still visible)

how to make texture invisible

what do you mean by "scenNodePos" ?

I think we well catch only sceneNodes which the mouse cursor move over, is that true ?

usually I select sceneNod using ray from camera toward the sceneNode,
I want to select more than sceneNode by drawing rectangle on the screen by dragging mouse and select all nodes behind this rectangle
any idea ?

how to make sun light and make it enter from windows of 3d building and make shadows
any help ?

thank you

i use this code core::line3d<f32> ray;
ray.start = secondarycamera->getPosition();
ray.end = ray.start + (secondarycamera->getTarget() - ray.start).normalize() * 1000.0f;

core::vector3df intersection;
core::triangle3df hitTriangle;

selectedSceneNode1 =
collMan ...

Thank you
but in irrlicht how can use bump texture ?

what is bump texture???
how can do it ????????

i am using collada with irrlicht, i load a collada model using this

scene::IAnimatedMesh* model;
smgr->getParameters()->setAttribute(irr::scene::COLLADA_CREATE_SCENE_INSTANCES, true);
model = smgr->getMesh("mesh.dae");

it works well
but I want to replace this model with another, i have to delete ...