ogre 2.1 terrain question

[nevarim]

hi all
i saw that in sample2 there is no samples about terrain usage

there is somthing new about this part of ogre? (ogreterrain)

thanks
Neva

[Thyrion]

http://www.ogre3d.org/forums/viewtopic.php?f=25&t=88798
The Terra system is WIP and still not merged into 2.1 "main"

[Arkiruthis]

On my setup the terrain sample is purple and shiny. Is that just a WIP thing?

dark_sylinc posted a screenshot in the thread Thyrion linked and it looked similar there too. But the other screenshots in that thread look correct with, well... green?

http://i.imgur.com/swSzem7.jpg

Quite keen to play around with it but just wondered if that was an issue with my graphics card not supporting something? I'm not even sure if I'm using Forward3D or not, I haven't changed anything in the sample code.

[dark_sylinc]

On my setup the terrain sample is purple and shiny.

That's because of extremely poor choice of material parameters (metalness, roughness & the textures). The purplenish was a test texture to check the diffuse was working and it was just never replaced (replacing textures is tricky because it has to look good and have a small impact on the repository size)

Is that just a WIP thing?

It's one of the most recent additions and thus the least tested ones. Particularly someone reported a few potential bugs with metalness and textures, but shouldn't be too hard to fix. I just haven't found the time yet.

[Arkiruthis]

Ah okay, no worries! Thanks Matias.

[nevarim]

in 2.1 there isn't this terrain sample right?

[Arkiruthis]

in 2.1 there isn't this terrain sample right?

What platform are you compiling on?

On Windows, inside the Visual Studio solution (OGRE.SLN) there should be a sub-project called "Sample_Tutorial_Terrain".

Did you select "CMAKE_BUILD_SAMPLES2" in the CMake setup? (it's off by default)

[Thyrion]

in 2.1 there isn't this terrain sample right?

You know what a branch is?
Branches:
- v2-1 -> ogre 2.1 main branch -> no terrain sample
- v2-1-pso -> ogre 2.1 development branch -> has the terrain sample
- v2-1-metal -> another development branch

"v2-1-pso" and "v2-1-metal" will be merged into v2-1 if finished/stable.

You can test the others if you don't want to wait.

[Arkiruthis]

Ah yep, I'm on the v2-1-PSO branch, I should've mentioned that.

[nevarim]

great this is working, but there isn't more the sample for to modify terrain?

[xrgo]

Hello! I am trying to integrate Terra in my engine, but I am getting a crash in update... this is what I am doing:

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void yTerraManager::init(){

    Ogre::Root* root = Ogre::Root::getSingletonPtr();
    Ogre::HlmsManager *hlmsManager = root->getHlmsManager();    
    Ogre::SceneManager* sceneManager = yGraphicsServices::getGraphicsSceneNodeManager().getMainSceneManager();
    Ogre::Camera* camera = yGraphicsServices::getGraphicsCameraManager().getMainCamera();
    Ogre::RenderWindow *renderWindow = yGraphicsServices::getGraphicsRender().getRenderWindow();
    Ogre::CompositorManager2 *compositorManager = root->getCompositorManager2();

    Ogre::ArchiveVec library;
    std::string renderSystemAppend = "GLSL";

    Ogre::String buffer;
    if( yUtils::getConfigFileSetting("RenderSystem", buffer) && buffer == "D3D" ) {
        renderSystemAppend = "HLSL";
    }
    Ogre::Archive *archiveTerra = Ogre::ArchiveManager::getSingletonPtr()->load( "../../yoyEngine/media/Hlms/Terra/"+renderSystemAppend, "FileSystem", true );

    Ogre::Archive *archiveLibraryCommon = Ogre::ArchiveManager::getSingletonPtr()->load("../../yoyEngine/media/Hlms/Common/"+renderSystemAppend, "FileSystem", true );
    Ogre::Archive *archiveLibraryCommonAny = Ogre::ArchiveManager::getSingletonPtr()->load("../../yoyEngine/media/Hlms/Common/Any", "FileSystem", true );
    Ogre::Archive *archivePbsLibrary = Ogre::ArchiveManager::getSingletonPtr()->load("../../yoyEngine/media/Hlms/Pbs/"+renderSystemAppend, "FileSystem", true );
    Ogre::Archive *archivePbsLibraryAny = Ogre::ArchiveManager::getSingletonPtr()->load("../../yoyEngine/media/Hlms/Pbs/Any", "FileSystem", true );
    library.push_back( archiveLibraryCommon );
    library.push_back( archiveLibraryCommonAny );
    library.push_back( archivePbsLibrary );
    library.push_back( archivePbsLibraryAny );


    Ogre::HlmsTerra *hlmsTerra = OGRE_NEW Ogre::HlmsTerra( archiveTerra, &library );
    hlmsManager->registerHlms( hlmsTerra );

#ifdef DEVELOPER
    QDir().mkdir("./hlmsShaders/terra/");
    hlmsTerra->setDebugOutputPath(true,"./hlmsShaders/terra/");
#else
    hlmsTerra->setDebugOutputPath(false);
#endif


    mTerra = new Ogre::Terra( Ogre::Id::generateNewId<Ogre::MovableObject>(),
                              &sceneManager->_getEntityMemoryManager( Ogre::SCENE_STATIC ),
                              sceneManager, 0, root->getCompositorManager2(),
                              camera );
    mTerra->setCastShadows( false );

    //mTerra->load( "Heightmap.png", Ogre::Vector3::ZERO, Ogre::Vector3( 256.0f, 1.0f, 256.0f ) );
    mTerra->load( "Heightmap.png", Ogre::Vector3( 64.0f, 4096.0f * 0.5f, 64.0f ), Ogre::Vector3( 4096.0f, 4096.0f, 4096.0f ) );

    Ogre::SceneNode *rootNode = sceneManager->getRootSceneNode( Ogre::SCENE_STATIC );
    Ogre::SceneNode *sceneNode = rootNode->createChildSceneNode( Ogre::SCENE_STATIC );
    sceneNode->attachObject( mTerra );


    Ogre::HlmsDatablock *datablock = hlmsTerra->getDatablock( "TerraExampleMaterial" );
    //Ogre::HlmsDatablock* datablock = hlmsTerra->createDatablock("test","test",Ogre::HlmsMacroblock(),Ogre::HlmsBlendblock(),Ogre::HlmsParamVec());

    mTerra->setDatablock( datablock );


    //dont care about shadow right now

//    //enable the shader pieces for pbs
//    Ogre::Hlms *hlmsPbs = hlmsManager->getHlms( Ogre::HLMS_PBS );
//    Ogre::Archive *archivePbs = hlmsPbs->getDataFolder();
//    Ogre::ArchiveVec libraryPbs = hlmsPbs->getPiecesLibraryAsArchiveVec();
//    libraryPbs.push_back( Ogre::ArchiveManager::getSingletonPtr()->load(
//                              "../../yoyEngine/media/Hlms/Terra/" + renderSystemAppend + "/PbsTerraShadows",
//                              "FileSystem", true ) );
//    hlmsPbs->reloadFrom( archivePbs, &libraryPbs );
//    {
//        Ogre::HlmsPbsTerraShadows* mHlmsPbsTerraShadows = new Ogre::HlmsPbsTerraShadows();
//        mHlmsPbsTerraShadows->setTerra( mTerra );
//        //Set the PBS listener so regular objects also receive terrain shadows
//        Ogre::Hlms *hlmsPbs = root->getHlmsManager()->getHlms( Ogre::HLMS_PBS );
//        hlmsPbs->setListener( mHlmsPbsTerraShadows );
//    }


    Ogre::CompositorWorkspace *oldWorkspace = yGraphicsServices::getGraphicsWorkspaceManager().getMainWorkspace();
    if( oldWorkspace )
    {
        Ogre::TexturePtr terraShadowTex = oldWorkspace->getExternalRenderTargets()[1].textures.back();
        if( terraShadowTex->getFormat() == Ogre::PF_NULL )
        {
            Ogre::ResourcePtr resourcePtr( terraShadowTex );
            Ogre::TextureManager::getSingleton().remove( resourcePtr );
        }
        compositorManager->removeWorkspace( oldWorkspace );
    }

    Ogre::CompositorChannelVec externalChannels( 2 );
    //Render window
    externalChannels[0].target = renderWindow;

    //Terra's Shadow texture
    Ogre::ResourceLayoutMap initialLayouts;
    Ogre::ResourceAccessMap initialUavAccess;

    const Ogre::ShadowMapper *shadowMapper = mTerra->getShadowMapper();
    shadowMapper->fillUavDataForCompositorChannel( externalChannels[1], initialLayouts,
                                                   initialUavAccess );

    compositorManager->addWorkspace( sceneManager, externalChannels, camera,
                                        "Tutorial_TerrainWorkspace", true, -1,
                                        (Ogre::UavBufferPackedVec*)0, &initialLayouts,
                                        &initialUavAccess );

    root->addFrameListener(this);

}

bool yTerraManager::frameRenderingQueued(const Ogre::FrameEvent &evt){ //I tried frameStarted too, and in an update() just before renderOneFrame()

    const float lightEpsilon = 0.0f;
    mTerra->update( Ogre::Vector3::NEGATIVE_UNIT_Y, lightEpsilon );

    return true;
}

this is the callstack (for some reason I can't examine the actual line inside addRenderable... although ogre is in Debug mode):

1 Ogre::RenderQueue::addRenderable BaseProjectDevSim 0x7ff6ef43e2d5
2 Ogre::RenderQueue::addRenderableV2 BaseProjectDevSim 0x7ff6ef433e81
3 Ogre::SceneManager::cullFrustum BaseProjectDevSim 0x7ff6ef05b7a5
4 Ogre::SceneManager::_updateWorkerThread BaseProjectDevSim 0x7ff6ef06f414
5 Ogre::updateWorkerThread BaseProjectDevSim 0x7ff6ef06f90c
6 Ogre::updateWorkerThread_internal BaseProjectDevSim 0x7ff6ef06f963
7 BaseThreadInitThunk KERNEL32 0x7ff9e4a02774
8 RtlUserThreadStart ntdll 0x7ff9e52c0d51

if I comment out this in Terra::optimizeCellsAndAdd:

Code: Select all

        while( itor != end )
            mRenderables.push_back( *itor++ );

it doesn't crash but obviously i don't see the terrain

if I set rootNode->setVisible(false); it also don't crash but again... no visible

if I create an empty datablock:

//Ogre::HlmsDatablock *datablock = hlmsTerra->getDatablock( "TerraExampleMaterial" );
Ogre::HlmsDatablock* datablock = hlmsTerra->createDatablock("test","test",Ogre::HlmsMacroblock(),Ogre::HlmsBlendblock(),Ogre::HlmsParamVec());

I get a different crash:

"Parameter called texShadowMap0 does not exist. Known names are: f3dGrid f3dGrid[0] f3dLightList f3dLightList[0] terrainNormals terrainNormals[0] terrainShadows terrainShadows[0] texCloudsShadows texCloudsShadows[0] " @0x61bc6fd418

which makes me think that some media/hlms paths are wrong but I double check them and I think I haven't missed anything.. the other resources needed (materials, textures, etc. are added when I init Ogre)

please help!

[xrgo]

Hello! I am trying to integrate Terra in my engine, but I am getting a crash in update...

FIXED!! the problem was that it was conflicting with my custom pieces for pbs lol.. and it needed a directional light beforehand

[xrgo]

I have another problem:

when I use a dimension different than Ogre::Vector3( 4096.0f, 4096.0f, 4096.0f ) I get weird normals, I (kind of) solved this by looking at the value that this working dimension uses for the vScale parameter.. and it gave me Vector3(0.000244141, 1, 0.000244141)... so if I force that value always for vScale it works fine with every dimension (that I tested). my guess is that this value is a normalized one with a 1 in Y, maybe can be hardcoded and that can optimize a bit the shaders? EDIT: well if I set a dimension Y of 0, it should be just a plane, but it also shows normals so obviously forcing the value is not correct, I don't know the solution of this yet

also terrain shadows are not working but I just started looking at this one =) EDIT: working now, i was just setting light direction wrong lol

EDIT2: shadows looks reeeeeeeally pixelated in the standard pbs objects when dimension is not 4096 =(

[dark_sylinc]

What dimensions are you using? I can't remember now if there were restrictions (e.g. multiple of 2, power of 2, etc)

[xrgo]

I tried with many numbers, multiple of 2 and power of 2 also... its really easy to see the problem when using a reflection texture, or just by doing

Code: Select all

	outColour.xyz = texture( terrainNormals, inPs.uv0.xy ).xyz

[dark_sylinc]

Please post some screenshots (restoring vScale to what the original code) and some code (all the parameters used).
Beware that when resolution changes, normals get less sharper.

[xrgo]

this is from the samples, I just changed this:

Code: Select all

        Ogre::HlmsManager *hlmsManager = root->getHlmsManager();
        //Ogre::HlmsDatablock *datablock = hlmsManager->getDatablock( "TerraExampleMaterial" );
        Ogre::HlmsDatablock *datablock = hlmsManager->getHlms( Ogre::HLMS_USER3 )->getDefaultDatablock();
//        Ogre::HlmsMacroblock macroblock;
//        macroblock.mPolygonMode = Ogre::PM_WIREFRAME;
        //datablock->setMacroblock( macroblock );


		Ogre::TexturePtr cubemap = Ogre::TextureManager::getSingletonPtr()->getByName("citadela_hor.dds");
		if (cubemap.isNull()) {
			cubemap = Ogre::TextureManager::getSingleton().load("citadela_hor.dds", Ogre::ResourceGroupManager::DEFAULT_RESOURCE_GROUP_NAME, Ogre::TEX_TYPE_CUBE_MAP, Ogre::MIP_DEFAULT, 1, false, Ogre::PF_UNKNOWN, true);
		}
		static_cast<Ogre::HlmsTerraDatablock*>(datablock)->setTexture(Ogre::TERRA_REFLECTION, 0, cubemap);

basically just using the default datablock and added a reflection cubemap

using 4096:

Code: Select all

        mTerra->load( "Heightmap.png", Ogre::Vector3( 64.0f, 4096.0f * 0.5f, 64.0f ), Ogre::Vector3(4096.0f, 4096.0f, 4096.0f) );

using 128:

Code: Select all

        mTerra->load( "Heightmap.png", Ogre::Vector3( 64.0f, 128.0f * 0.5f, 64.0f ), Ogre::Vector3(128.0f, 128.0f, 128.0f) );

looks like it just has more roughness, but if I look up it looks like this:

so you can see its still very glossy =)

now with

Code: Select all

outColour.xyz = texture( terrainNormals, inPs.uv0.xy ).xyz

using 4096:

using 128:


the effect is proportionally affected with the dimension, in other word for values farther away from 4096 the normals are worst

[dark_sylinc]

I totally misunderstood what you were doing (there is no restriction on dimensions being power of 2 or multiple of 2; I thought you were talking about the heightmap's resolution).

This is clearly a very stupid bug. m_xzRelativeSize is set right after calling createHeightmap, instead of being set before.

[dark_sylinc]

Pushed a fix.

Let me know if this fixes your issues!

[xrgo]

yes at first glance its working! thank you so much!!

[xrgo]

me haz another question..
My engine has the ability to take 8k screenshots, and I would like to disable LOD for the terrain at that moment because it looks very bad.
Also I can capture 360 video but the terrain is only displayed in one view of the cubemap... fo the rest is invisible

The question is... Since I don't care much for performance while doing those things... How can I disable all those optimizations? LOD and cell hiding

EDIT: increasing basePixelDimension and vertPixelDimension in update seems to solve the LOD problem, I can make a setter that does it temporarily =)

[123iamking]

I want to add physic to terrain, but I don't know how.
Here is my attempt: I checked out the array m_terrainCells, I think it may hold the information that form the terrain, but when I take a look at each terrain cell, I don't know how to form the triangle to fit a terrain cell (I think use btBvhTriangleMeshShape may be appropriated for terrain). I also took a look at btOgre2.1, but can't find a way to use it to add physic to terrain.

[xrgo]

Hello, A few thoughts on Terra:
in the pixel shader shouldn't be the default value when no detail rough or metal be 1 instead of 0...

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	@property( roughness_map@n )
		float roughness@n = texture( textureMaps[@value( roughness_map@n_idx )],
									vec3( inPs.uv0.xy * material.detailOffsetScale[@value(currOffsetDetail)].zw +
											material.detailOffsetScale[@value(currOffsetDetail)].xy,
											@value( roughness_map@n_idx_slice ) ) ).x;
	@end @property( !roughness_map@n )
		float roughness@n = 0; //<<<<<<<<<<should be 1
	@end

so later when multiplied by the material value...

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	ROUGHNESS =			(roughness0 * detailWeights.x * material.roughness.x +
						 roughness1 * detailWeights.y * material.roughness.y) +
						(roughness2 * detailWeights.z * material.roughness.z +
						 roughness3 * detailWeights.w * material.roughness.w);

its not always 0.

aaaand, the mixing of the details I think it should be something like this:

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			diffuseCol.xyz = mix( detailCol0,  detailCol1, sqrt(detailWeights.x) );
			diffuseCol.xyz = mix( diffuseCol.xyz,  detailCol2, sqrt(detailWeights.y) );
			diffuseCol.xyz = mix( diffuseCol.xyz,  detailCol3, sqrt(detailWeights.z) );

(the sqrt is just because of the gamma)
this makes more sense, so in the detailWeights texture when I see Red I can actually see the first detail, and when Blue I can see the second... and so on

Saludos!