TerrainMesh Problem

Hobi · Post by **Hobi** » Sat Jul 24, 2004 6:46 pm

Hi!

Could someone please post a small code for displaying a terrainmesh?

Im a beginner and i dont know, what im doing wrong:

device = createDevice(video::EDT_DIRECTX9, core::dimension2d<s32>(640, 480), 32, false, true, 0);
driver = device->getVideoDriver();
smgr = device->getSceneManager();

TerrainNode = smgr->addTerrainMesh("Terrain",
driver->createImageFromFile("media/terrainmap.jpg"),
driver->createImageFromFile("media/heightmap.png"),
dimension2d< f32 >(300.0f, 300.0f),
500.0f,
dimension2d< s32 >(512, 512));

TerrainSceneNode = smgr->addAnimatedMeshSceneNode( TerrainNode );

smgr->addCameraSceneNodeFPS(0, 100.0f, 100.0f);
device->getCursorControl()->setVisible(false);

there is no syntax error. I dont know what im doing wrong, because there is nothing displayed.

agrif · Post by **agrif** » Sat Jul 24, 2004 7:03 pm

You might want to set the scene node's lighting to false. Without any lights, the scene would be completly black. By setting the lighting flag to false, the object will be displayed even with no lights.

Set the flag with:

Code: Select all

TerrainSceneNode->setMaterialFlag(video::EMF_LIGHTING, false);

place this after you make the scene node, of course.

agrif

agrif · Post by **agrif** » Sat Jul 24, 2004 7:11 pm

Woops. Forgot somthing. Sorry for the double post.

did you add a loop to draw anything?

somthing like:

Code: Select all

while(device->run() && driver)
{
        driver->beginScene(true, true, video::SColor(255,0,0,255));
        scenemgr->drawAll();
        driver->endScene();
}

device->drop();

should go at the end of the main() function.

Also, you didn't seem to declare the variables at all. For example, the device should be declared as "IrrlichtDevice *device = createDevice()". Make sure you declare your variables.

agrif

Guest · Post by **Guest** » Sat Jul 24, 2004 7:13 pm

Thank you for your posting, but when i add these code:

device = createDevice(video::EDT_DIRECTX9, core::dimension2d<s32>(640, 480), 32, false, true, 0);
driver = device->getVideoDriver();
smgr = device->getSceneManager();

TerrainNode = smgr->addTerrainMesh("Terrain",
driver->createImageFromFile("media/terrainmap.jpg"),
driver->createImageFromFile("media/heightmap.png"),
dimension2d< f32 >(300.0f, 300.0f),
500.0f,
dimension2d< s32 >(512, 512));

TerrainSceneNode = smgr->addAnimatedMeshSceneNode( TerrainNode );

TerrainSceneNode->setMaterialFlag(video::EMF_LIGHTING, false);

smgr->addCameraSceneNodeFPS(0, 100.0f, 100.0f);
device->getCursorControl()->setVisible(false);

I receive a null-pointer-exception....

TerrainSceneNode doesnt seem to be set???

Guest · Post by **Guest** » Sat Jul 24, 2004 7:13 pm

Thank you for your posting, but when i add these code:

device = createDevice(video::EDT_DIRECTX9, core::dimension2d<s32>(640, 480), 32, false, true, 0);
driver = device->getVideoDriver();
smgr = device->getSceneManager();

TerrainNode = smgr->addTerrainMesh("Terrain",
driver->createImageFromFile("media/terrainmap.jpg"),
driver->createImageFromFile("media/heightmap.png"),
dimension2d< f32 >(300.0f, 300.0f),
500.0f,
dimension2d< s32 >(512, 512));

TerrainSceneNode = smgr->addAnimatedMeshSceneNode( TerrainNode );

TerrainSceneNode->setMaterialFlag(video::EMF_LIGHTING, false);

smgr->addCameraSceneNodeFPS(0, 100.0f, 100.0f);
device->getCursorControl()->setVisible(false);

I receive a null-pointer-exception....

TerrainSceneNode doesnt seem to be set???

Guest · Post by **Guest** » Sat Jul 24, 2004 7:15 pm

the device is set elsewhere.

and i have a loop, too.

i dont think that there is the peoblem...

Guest · Post by **Guest** » Sat Jul 24, 2004 7:20 pm

i added a simple mesh to the scene...and there is no problem with it.
only the terrain is not displayed.

Guest · Post by **Guest** » Sat Jul 24, 2004 11:51 pm

Im so far, that i know, that this code doesn't save mesh data to "Terrain", because i get a nulll pointer exception, if i want to use the mesh data with another function e.g. to attach it to the TerrainSceneNode...

Code: Select all

TerrainMesh = smgr->addTerrainMesh("terrain", 
										driver->createImageFromFile("media/terrainmap.jpg"),
										driver->createImageFromFile("media/heightmap.png"),
										dimension2d< f32 >(300.0f, 300.0f),
										500.0f,
										dimension2d< s32 >(512, 512));
	
    mesh = smgr->getMesh("terrain");
										

	TerrainSceneNode = smgr->addAnimatedMeshSceneNode( mesh );

	TerrainSceneNode->setMaterialFlag(video::EMF_LIGHTING, false); <--- here i get the exception :cry: 

please help!

mm765 · Post by **mm765** » Sun Jul 25, 2004 1:29 am

why dont you use
TerrainSceneNode = smgr->addAnimatedMeshSceneNode( TerrainMesh );
?
edit: and the defaultvertexblocksize is probably far too big. try 32 or 64.

Endar · Post by **Endar** » Sun Jul 25, 2004 8:03 am

Just a quick question........ can Irrlicht read ".png" image files??

bal · Post by **bal** » Sun Jul 25, 2004 8:59 am

Endar wrote:Just a quick question........ can Irrlicht read ".png" image files??

No.

Endar · Post by **Endar** » Sun Jul 25, 2004 9:21 am

Aaaahh, so, trying to load a png file when irrlicht can't read them, this could possibly lead to problems.....maybe problems such as above???

Hobi · Post by **Hobi** » Sun Jul 25, 2004 11:04 am

At first: Thank you very much for your help!!!
my terrain is displayed now. It was the file format!!
But now i have another problem. My terrain looks very strange.

its repeating itself in a first row, and then there are more copys of it (3x3) which have only peeks on it. Also the texture seems to be rasterized, and is not scaled to the size of my terrain(although the image is the same size). It is much bigger.

And what does the parameter with the default vertex size do? i couldn't find anything exactly in the api. I found out that here is only working (64, 64).[/img]

Hobi · Post by **Hobi** » Sun Jul 25, 2004 11:43 am

OHH!!!
i fixed the problem

i had to convert my heightmap to a color image, so that it fits to the texture image!

thanks to everyone again!!

Guest · Post by **Guest** » Fri Jul 30, 2004 9:04 am

How does one go about "positioning" textures/terrains like this? Say that I load this one terrain as "A" and I want it surrounded by water terrains "B" how would I position this.

BBB
BAB
BBB

?