Create a 2d navigation map

[ansonbx]

I am a new comer and learning irrlicht engine now.
I want to build a 2d navigation map throught a 3d scene!
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I MEAN,first load a 3d scene then generate a 2d navigation map(Bird Eye View Map) ,automatically.
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How to do that?
Thank you very much!

[Escen]

Maybe you can take a look at this.
http://irrlicht.sourceforge.net/phpBB2/ ... ght=compas

[ansonbx]

Maybe you can take a look at this.
http://irrlicht.sourceforge.net/phpBB2/ ... ght=compas

Thanks all the same!Although,it is not the wanted answer!

[vitek]

You can use some of that code to render a 2d map on screen. You should also be able to use a projection matrix to draw dots on the map.

Travis

[Escen]

I MEAN,first load a 3d scene then generate a 2d navigation map(Bird Eye View Map) ,automatically.

first option:
If you want realtime camera view you can use a SplitScreen.
The image is rendered for every viewport seperately. That means, that you'll loose performance.
Take a look at the SplitScreen example and replace this code part:

Code: Select all

driver->beginScene(true,true,SColor(255,100,100,100));
		
		smgr->drawAll();
               //If SplitScreen is used
		if (SplitScreen)
		{
		    driver->clearZBuffer();
			//Activate camera1
			smgr->setActiveCamera(camera[1]);
			//Set viewpoint to the first quarter (left top)
			driver->setViewPort(rect<s32>(0,0,ResX/2,ResY/2));
			//Draw scene
			smgr->drawAll();
            //return viewport fullscreen
			driver->setViewPort(rect<s32>(0,0,ResX,ResY));
        }
driver->endScene();

To prevent intersecting both viewports you have to clear de Zbuffer between them.

second option:
If a more static overview is desired you can render a 2d map on screen, render single time.

define a texture:

Code: Select all

 video::ITexture* rt = 0;
    rt = driver->addRenderTargetTexture(core::dimension2d<u32>(256,256), "RTT1");

And again replace in the SplitScreen example the following code.
In this code we only create the texture ones by turning off SplitScreen after the first render, just to keep example code simple.

Code: Select all

driver->beginScene(true,true,SColor(255,100,100,100));
        smgr->setActiveCamera(camera[3]);
		//Draw scene
        smgr->drawAll();
		//If SplitScreen is used
		    if (SplitScreen)
		{
			//Activate camera1
			smgr->setActiveCamera(camera[1]);
			driver->setRenderTarget(rt, true, true, video::SColor(0,0,0,255));

			smgr->drawAll();

            driver->setRenderTarget(0, true, true, 0);
            SplitScreen=false;
		}
		

        driver->draw2DImage(rt,vector2di(0,0),rect<s32> (0,0, 256, 256), 0);

driver->endScene();

I hope this helps you a bit.

[wowdevver24]

is this not just an issue of rotating the camera (which btw should have an absolute function just for things like this! and yes I am writing one)

once absolute camera rotation is achieved then it should be very easy because you would just rotate looking at y at 90degrees