New Tiled Terrain Scene Node [works with Irr 1.5]

arras · Post by **arras** » Wed Jul 18, 2007 8:21 pm

Bye the way, there was some interest from Irrlicht team about my terrain. Here is part of message I received from afecelis when I was asking for 3D forum (I hope he dont mind if I post it here):

BTW, Niko and us in the team are very impressed by your terrain scene node. Niko says he's always wanted that kind of node for Irrlicht, so we're discussing the possibility of merging it into the source. Would that be ok with you?

I dont know what they decided at the end. May be somebody is working on it and may be not.

arras · Post by **arras** » Wed Jul 18, 2007 9:12 pm

Here is example code of automatic blending of two textures. Its done on single tile just for demonstration. Replace "dirth.bmp" and "grass.bmp" with your own textures. Change vertex color to blend textures in diferent order:

Code: Select all

#include <irrlicht.h>
using namespace irr;

class TestSceneNode : public scene::ISceneNode
{
    video::S3DVertex VertexA[4];
    video::S3DVertex VertexB[4];
    
	u16 IndexA[6];
	u16 IndexB[6];
    
    core::aabbox3d<f32> BoundingBox;
    
    video::SMaterial Material[2];
    
public:
    
    TestSceneNode(scene::ISceneNode* parent, scene::ISceneManager* smgr, s32 id, f32 width, f32 height)
    : scene::ISceneNode(parent, smgr, id)
    {
        VertexA[0].Pos = core::vector3df(0,0,0);
        VertexA[1].Pos = core::vector3df(0,0,height);
        VertexA[2].Pos = core::vector3df(width,0,height);
        VertexA[3].Pos = core::vector3df(width,0,0);
        
        VertexA[0].Normal = core::vector3df(0,1,0);
        VertexA[1].Normal = core::vector3df(0,1,0);
        VertexA[2].Normal = core::vector3df(0,1,0);
        VertexA[3].Normal = core::vector3df(0,1,0);
        
        VertexA[0].Color = video::SColor(0,0,0,0);
        VertexA[1].Color = video::SColor(0,0,0,0);
        VertexA[2].Color = video::SColor(255,255,255,255);
        VertexA[3].Color = video::SColor(255,255,255,255);
        
        VertexA[0].TCoords = core::vector2df(0,1);
        VertexA[1].TCoords = core::vector2df(0,0); 
        VertexA[2].TCoords = core::vector2df(1,0); 
        VertexA[3].TCoords = core::vector2df(1,1);
        
        IndexA[0] = 0;
        IndexA[1] = 1;
        IndexA[2] = 2;
        
        IndexA[3] = 0;
        IndexA[4] = 2;
        IndexA[5] = 3;
        
        VertexB[0].Pos = core::vector3df(0,0,0);
        VertexB[1].Pos = core::vector3df(0,0,height);
        VertexB[2].Pos = core::vector3df(width,0,height);
        VertexB[3].Pos = core::vector3df(width,0,0);
        
        VertexB[0].Normal = core::vector3df(0,1,0);
        VertexB[1].Normal = core::vector3df(0,1,0);
        VertexB[2].Normal = core::vector3df(0,1,0);
        VertexB[3].Normal = core::vector3df(0,1,0);
        
        VertexB[0].Color = video::SColor(255,255,255,255);
        VertexB[1].Color = video::SColor(255,255,255,255);
        VertexB[2].Color = video::SColor(0,0,0,0);
        VertexB[3].Color = video::SColor(0,0,0,0);
        
        VertexB[0].TCoords = core::vector2df(0,1);
        VertexB[1].TCoords = core::vector2df(0,0); 
        VertexB[2].TCoords = core::vector2df(1,0); 
        VertexB[3].TCoords = core::vector2df(1,1);
        
        IndexB[0] = 0;
        IndexB[1] = 1;
        IndexB[2] = 2;
        
        IndexB[3] = 0;
        IndexB[4] = 2;
        IndexB[5] = 3;
        
        BoundingBox.reset(VertexA[0].Pos);
		for (s32 i=1; i<4; ++i)
			BoundingBox.addInternalPoint(VertexA[i].Pos);
		
		video::IVideoDriver* driver = SceneManager->getVideoDriver();

		Material[0].MaterialType = video::EMT_TRANSPARENT_VERTEX_ALPHA;
		Material[0].Textures[0] = driver->getTexture("grass.bmp");

		Material[1].MaterialType = video::EMT_TRANSPARENT_VERTEX_ALPHA;
		Material[1].Textures[0] = driver->getTexture("dirth.bmp");
    }
    
    virtual void OnRegisterSceneNode()
	{
		if (IsVisible)
			SceneManager->registerNodeForRendering(this);

		ISceneNode::OnRegisterSceneNode();
	}
	
	virtual void render()
	{
        video::IVideoDriver* driver = SceneManager->getVideoDriver();
        if (!driver) return;
        
        driver->setTransform(video::ETS_WORLD, AbsoluteTransformation);
    
		driver->setMaterial(Material[0]);
		driver->drawIndexedTriangleList(&VertexA[0], 4, &IndexA[0], 2);
		
		driver->setMaterial(Material[1]);
		driver->drawIndexedTriangleList(&VertexB[0], 4, &IndexB[0], 2);
	}
	
	virtual const core::aabbox3d<f32>& getBoundingBox() const
	{
		return BoundingBox;
	}
    
	virtual u32 getMaterialCount()
	{
		return 2;
	}
    
	virtual video::SMaterial& getMaterial(u32 i)
	{
		return Material[i];
	}
};


int main()
{
    IrrlichtDevice *device = createDevice(
        video::EDT_DIRECT3D9,
        //video::EDT_OPENGL,
        core::dimension2d<s32>(640, 480), 32, false, false, false, 0);
    
    video::IVideoDriver* driver = device->getVideoDriver();
	scene::ISceneManager* smgr = device->getSceneManager();
	
	TestSceneNode *tile =  new TestSceneNode(smgr->getRootSceneNode(), smgr, -1, 10.0f, 10.0f);
	tile->drop();
	
	tile->setMaterialFlag(video::EMF_LIGHTING, true);
	
	smgr->addCameraSceneNode(0, core::vector3df(5, 5, -5), core::vector3df(5, 0, 5));
	
	scene::ILightSceneNode* light = smgr->addLightSceneNode(0, core::vector3df(0,10,0), 
		video::SColorf(255, 255, 255, 255), 1000.0f);

	while(device->run())
    {
        driver->beginScene(true, true, video::SColor(255,100,101,140));

		smgr->drawAll();

		driver->endScene();
    }
    device->drop();
    
    return 0;
}

Like this user would not need to create texture sets. Also you are not limited in nubmer of textures. You can blend 4 textures on one tile easyly.

Problem is that EMT_TRANSPARENT_VERTEX_ALPHA material type is not working under OpenGL when lighting is on.

Also there is no detail map wersion of EMT_TRANSPARENT_VERTEX_ALPHA.
There are EMT_NORMAL_MAP_TRANSPARENT_VERTEX_ALPHA and EMT_PARALLAX_MAP_TRANSPARENT_VERTEX_ALPHA materials awailable so normal maps and parallax maps would be possible.

If somebody can fix EMT_TRANSPARENT_VERTEX_ALPHA with OpenGL that would be great.

[EDIT] I forget to note that I was testing this with Irrlicht 1.3. If somebody have 1.31 instaled, please let me know howe ots working.

elvman · Post by **elvman** » Wed Jul 18, 2007 9:30 pm

Check out this thread. I created it for my terrain editor.

elvman · Post by **elvman** » Fri Jul 20, 2007 12:17 pm

Arras, please check out this for terrain smoothing. It would be grate if the terrain was smooth.

arras · Post by **arras** » Fri Jul 20, 2007 2:50 pm

My node have smoothing. It recalculate normals.

Code on that post was implemented it to Irrlicht terrain node as much as I know and its more way howe to load large terrain from small heightmap.

It would be possible to extend my node with it by modiffiing source code from Irrlicht terrain. But permission from author would be needed.

elvman · Post by **elvman** » Sat Jul 21, 2007 4:36 pm

Can somebody explain, why are these black lines there at the side of the hill?
Edit: I am using ShlTerrainSceneNode with Direct3D (with OpenGL everything is fine)

Virion · Post by **Virion** » Sun Jul 22, 2007 4:33 am

Bug in the engine?

arras · Post by **arras** » Mon Jul 23, 2007 7:08 am

I dont have idea. I have never encoutered something like that. Something with Z-buffer may be?

elvman · Post by **elvman** » Mon Jul 23, 2007 2:01 pm

So this is a question to Irrlicht's developers.

arras · Post by **arras** » Mon Jul 23, 2007 3:16 pm

I realy dont know. You may try to post in on Advanced forum, perhaps ther is somebody who can help you.

elvman · Post by **elvman** » Thu Aug 02, 2007 7:42 pm

Found memory leak in ShlTerrainNode (in array2d class):
if you create elements like this:
for(int i=0; i<w; i++) data = new T[h];
then you have to delete them in the same way:
for(int i=0; i<w; i++) delete [] data;

arras · Post by **arras** » Fri Aug 03, 2007 7:26 am

Right. Brackets are missing. Corrected. Link updated.

Thanks a lot.

slaaitjuh · Post by **slaaitjuh** » Tue Aug 07, 2007 2:36 pm

Is there any wrapper/conversion for this, so it can be used in Irrlicht NET CP? I am not that good in C# yet to just write my own wrapper, i don't even have a clue where to start...

Thanks!

arras · Post by **arras** » Tue Aug 07, 2007 3:57 pm

neotoma was working on one lately but I dont know what stage is his work in. Try to ask him.

slaaitjuh · Post by **slaaitjuh** » Sun Aug 12, 2007 9:59 pm

he doesn't respond to my PM