Irrlicht Engine

Posted: **Tue Aug 11, 2009 9:43 am**

Hi all!

I don't know if this is a bug or if i just misunderstood the function. So here's my test code:

#include <irrlicht.h>

using namespace irr;
using namespace core;
using namespace scene;
using namespace video;
using namespace io;
using namespace gui;

IrrlichtDevice* device;
IVideoDriver* driver;
ISceneManager* smgr;
IGUIEnvironment* guienv;
ISceneNode* node;

class MyEventReceiver:public IEventReceiver
{
    public:
    MyEventReceiver() { LastNode = 0; }

    virtual bool    OnEvent(const SEvent& event)
    {
        switch(event.EventType)
        {
            case EET_KEY_INPUT_EVENT:
            {
                switch(event.KeyInput.Key)
                {
                    case KEY_ESCAPE:
                    {
                        device->closeDevice();
                        return true;
                    }
                }
            }

            case EET_MOUSE_INPUT_EVENT:
            {
                case EMIE_MOUSE_MOVED:
                {
                    s32 xPos, yPos;
                    ISceneNode* TestNode;

                    xPos = event.MouseInput.X;
                    yPos = event.MouseInput.Y;
                    TestNode = smgr->getSceneCollisionManager()->getSceneNodeFromScreenCoordinatesBB(position2d<s32>(xPos, yPos));

                    if( TestNode != 0 && LastNode == 0 )
                    {
                        LastNode = TestNode;
                        LastNode->setScale(vector3df(1.1f,1.1f,1.1f));
                        switch (LastNode->getID())
                        {
                            case 100:
                            {
                                smgr->getSceneNodeFromId(101)->setVisible(true);
                            }
                            break;
                            case 102:
                            {
                                smgr->getSceneNodeFromId(103)->setVisible(true);
                            }
                            break;
                            case 104:
                            {
                                smgr->getSceneNodeFromId(105)->setVisible(true);
                            }
                            break;
                        }
                    }
                    else if( TestNode != 0 && LastNode != 0 )
                    {
                        LastNode->setScale(vector3df(1.0f,1.0f,1.0f));
                        switch (LastNode->getID())
                        {
                            case 100:
                            {
                                smgr->getSceneNodeFromId(101)->setVisible(false);
                            }
                            break;
                            case 102:
                            {
                                smgr->getSceneNodeFromId(103)->setVisible(false);
                            }
                            break;

                            case 104:
                            {
                                smgr->getSceneNodeFromId(105)->setVisible(false);
                            }
                            break;
                        }
                        LastNode = TestNode;
                        LastNode->setScale(vector3df(1.1f,1.1f,1.1f));
                         switch (LastNode->getID())
                        {
                            case 100:
                            {
                                smgr->getSceneNodeFromId(101)->setVisible(true);
                            }
                            break;
                            case 102:
                            {
                                smgr->getSceneNodeFromId(103)->setVisible(true);
                            }
                            break;
                            case 104:
                            {
                                smgr->getSceneNodeFromId(105)->setVisible(true);
                            }
                            break;
                        }
                   }
                    return true;
                }
            }
        }

        return false;
    }

    private:
    ISceneNode*     LastNode;
};

int main(int argc, char** argv)
{
    MyEventReceiver receiver;

    device = createDevice(EDT_OPENGL, dimension2d<s32>(640, 480), 32, false, false, false, &receiver);
    device->setWindowCaption(L"Irrlicht Engine Test");

    driver = device->getVideoDriver();
    smgr = device->getSceneManager();
    guienv = device->getGUIEnvironment();

    node = smgr->addSphereSceneNode(1.0f, 64, 0, 100, vector3df(0,5,0));
    smgr->addTextSceneNode(guienv->getBuiltInFont(), L"Planet 1", SColor(255,255,255,255), node, vector3df(1.5f,1.5f,0.0f), 101);
    node->setMaterialFlag(EMF_LIGHTING, false);
    node = smgr->addSphereSceneNode(1.0f, 64, 0, 102, vector3df(5,0,0));
    smgr->addTextSceneNode(guienv->getBuiltInFont(), L"Planet 2", SColor(255,255,255,255), node, vector3df(1.5f,1.5f,0.0f), 103);
    node->setMaterialFlag(EMF_LIGHTING, false);
    node = smgr->addSphereSceneNode(1.0f, 64, 0, 104, vector3df(-5,-5,0));
    smgr->addTextSceneNode(guienv->getBuiltInFont(), L"Planet 3", SColor(255,255,255,255), node, vector3df(1.5f,1.5f,0.0f), 105);
    node->setMaterialFlag(EMF_LIGHTING, false);

    smgr->getSceneNodeFromId(101)->setVisible(false);
    smgr->getSceneNodeFromId(103)->setVisible(false);
    smgr->getSceneNodeFromId(105)->setVisible(false);

    smgr->addCameraSceneNode(0, vector3df(0,0,-25), vector3df(0,0,0));

    device->getCursorControl()->setVisible(true);

    while(device->run())
    {
        driver->beginScene(true, true, SColor(0,0,0,0));

        smgr->drawAll();
        guienv->drawAll();
        driver->draw3DLine(vector3df(0,5,0), vector3df(5,0,0), SColor(255,255,255,0));

        driver->endScene();
    }

    device->drop();

    return 0;
}

Short explanation: I add 3 Spherenodes at (0,5,0)/(5,0,0)/(-5,-5,0) and attach 3 Textnodes as child at (1.5,1.5,1.5). So long so good.

But within the Renderfunction i tried to draw a 2dline from Sphere 1 (0,5,0) to Sphere 2 (5,0,0). The result looks like this:

OpenGL: the line draws away from the desired location and "jumps" if i go over one sphere (if one sphere is hit by mouse it scales to 1.1f and shows the Textnode).

Direct3D: same as OpenGL beside the location, but if i hit one sphere the line completely disappears

Depends this on my code? I don't know.

greetings

radical

EDIT: Compiled with Code::Blocks @ XP and MSVC at Win7 RC - API v1.5.1

Posted: **Tue Aug 11, 2009 10:17 am**

This isn't a bug, though maybe the docs could be more clear. You have to call setTransform and setMaterial before using the driver's draw3d functions.
See the custom scene node tutorial for an example.

Posted: **Tue Aug 11, 2009 11:05 am**

Don't know how much clearer one can get

Note that the line is drawn using the current transformation
matrix and material. So if you need to draw the 3D line
independently of the current transformation, use
\code
driver->setMaterial(unlitMaterial);
driver->setTransform(video::ETS_WORLD, core::matrix4());
\endcode
for some properly set up material before drawing the line.

Posted: **Tue Aug 11, 2009 11:36 am**

Uiuiui...shame on me

Basics of 3D-maths...going back to the books

Sorry

Posted: **Tue Aug 11, 2009 2:59 pm**

Shame on me too, I didn't check either

Irrlicht Engine

[no bug] Draw3DLine don't draw at given positions

[no bug] Draw3DLine don't draw at given positions