OgrePolyvoxInterface::OgrePolyvoxInterface() {
scene = (Ogre::SceneManager*)GraphicsManager::instance()->getInterface()->getScene();
int width, height;
LOG("Creating heightmap");
float* heightmap = CreateHeightmapFromFile("..\\heightmap.png", width, height, 1.f);
LOG("Creating volume");
volume = new PolyVox::Volume<PolyVox::MaterialDensityPair44>(PolyVox::Region(Vector3DInt32(0,0,0), Vector3DInt32(width-1, 63, height-1)));
LOG("Writing heightmap to volume");
createHeightmapInVolume(volume, heightmap, width, height);
mesh = new PolyVox::SurfaceMesh<PositionMaterialNormal>();
SurfaceExtractor<MaterialDensityPair44> surfaceExtractor(volume, volume->getEnclosingRegion(), mesh);
surfaceExtractor.execute();
const std::vector<boost::uint32_t>& indices = mesh->getIndices();
const std::vector<PositionMaterialNormal>& vertices = mesh->getVertices();
node = scene->getRootSceneNode()->createChildSceneNode();
obj = scene->createManualObject();
int vertex_count = mesh->getNoOfVertices();
int index_count = mesh->getNoOfIndices();
obj->estimateVertexCount(vertex_count);
obj->estimateIndexCount(index_count);
LOG("Building manual object");
obj->begin("BaseWhite", Ogre::RenderOperation::OT_TRIANGLE_LIST);
LOG("Building vertex data");
for(std::vector<PositionMaterialNormal>::const_iterator pmn = vertices.begin(); pmn != vertices.end(); pmn++) {
PolyVox::Vector3DFloat position = (*pmn).getPosition();
PolyVox::Vector3DFloat normal = (*pmn).getNormal();
obj->position(position.getX(), position.getY(), position.getZ());
obj->normal(normal.getX(), normal.getY(), normal.getZ());
}
LOG("Building indices");
for(int i=0; i<mesh->getNoOfIndices(); i+=3) {
obj->triangle(indices[i], indices[i+1], indices[i+2]);
}
obj->end();
char mesh_name[32];
sprintf(mesh_name, "%i%i", rand()%1000, rand()%1000, rand()%1000, rand()%1000);
LOG("Converting to mesh");
Ogre::MeshPtr ptr = obj->convertToMesh(mesh_name);
Ogre::Mesh* ogremesh = ptr.get();
Ogre::Entity* entity = scene->createEntity("TilemapEntity", mesh_name);
node->attachObject(entity);
LOG("Done!");
}
void VoxelTerrain::mesh()
{
PolyVox::SurfaceMesh<PolyVox::PositionMaterialNormal> mesh;
PolyVox::Region region(PolyVox::Vector3DInt32(0,0,0),
PolyVox::Vector3DInt32(120, 60, 120));
//PolyVox::Vector3DInt32(120, 130, 120));
std::cout << "Begin extracting surface." << std::endl;
//PolyVox::MarchingCubesSurfaceExtractor<PolyVox::LargeVolume<BYTE> >
PolyVox::CubicSurfaceExtractorWithNormals<PolyVox::LargeVolume<BYTE> >
surface_extractor(mVolumeData,
region,
&mesh);
surface_extractor.execute();
std::cout << "Done extracting surface." << std::endl;
begin("Terrain", Ogre::RenderOperation::OT_TRIANGLE_LIST);
{
const std::vector<PolyVox::PositionMaterialNormal>& vecVertices =
mesh.getVertices();
const std::vector<uint32_t>& vecIndices = mesh.getIndices();
unsigned int uLodLevel = 0;
int beginIndex = mesh.m_vecLodRecords[uLodLevel].beginIndex;
int endIndex = mesh.m_vecLodRecords[uLodLevel].endIndex;
for(int index = beginIndex; index < endIndex; ++index) {
const PolyVox::PositionMaterialNormal& vertex =
vecVertices[vecIndices[index]];
const PolyVox::Vector3DFloat& v3dVertexPos = vertex.getPosition();
const PolyVox::Vector3DFloat& v3dVertexNormal = vertex.getNormal();
const PolyVox::Vector3DFloat v3dFinalVertexPos =
v3dVertexPos +
static_cast<PolyVox::Vector3DFloat>(mesh.m_Region.getLowerCorner());
position(v3dFinalVertexPos.getX(), v3dFinalVertexPos.getY(), v3dFinalVertexPos.getZ());
normal(v3dVertexNormal.getX(), v3dVertexNormal.getY(), v3dVertexNormal.getZ());
//colour(1, 0, 0, 0.5);
textureCoord(v3dFinalVertexPos.getX()/4.0f,
v3dFinalVertexPos.getY()/4.0f,
v3dFinalVertexPos.getZ()/4.0f);
}
}
end();
}
void World::polyVoxMeshToOgreObject(PolyVox::SurfaceMesh<PolyVox::PositionMaterialNormal>* mesh,Ogre::ManualObject* mo) {
// make sure mesh is allocated and valid first:
if (mesh == NULL || mesh->getNoOfVertices() < 1) {
Utils::log("ERROR: World::polyVoxMeshToOgreObject() got a mesh with no data.");
return;
} else if (mesh->getNoOfIndices() < 1) {
Utils::log("ERROR: World::polyVoxMeshToOgreObject() got a mesh with no indices.");
return;
}
const std::vector<uint32_t>& indices = mesh->getIndices();
const std::vector<PolyVox::PositionMaterialNormal>& vertices = mesh->getVertices();
uint32_t numIndices = mesh->getNoOfIndices();
uint32_t numVertices = mesh->getNoOfVertices();
mo->estimateIndexCount(numIndices);
mo->estimateVertexCount(numVertices);
mo->begin("BaseWhiteNoLighting", Ogre::RenderOperation::OT_TRIANGLE_LIST);
PolyVox::Vector3DFloat position;
PolyVox::Vector3DFloat normal;
float material;
int textureIndex = 0;
const Ogre::Vector2 texCoords[4] = { Ogre::Vector2(0.0f, 1.0f), Ogre::Vector2(1.0f, 1.0f), Ogre::Vector2(0.0f, 0.0f), Ogre::Vector2(1.0f, 0.0f) };
// vertices:
for(unsigned int i=0; i<numVertices; ++i) {
position = vertices[i].getPosition();
normal = vertices[i].getNormal();
material = vertices[i].getMaterial();
mo->position((Ogre::Real)(position.getX()), (Ogre::Real)(position.getY()), (Ogre::Real)(position.getZ()));
mo->normal( (Ogre::Real)(normal.getX()), (Ogre::Real)(normal.getY()), (Ogre::Real)(normal.getZ()));
mo->textureCoord(texCoords[textureIndex++ % 4]);
}
// indices:
for(unsigned int i = 0 ; i < numIndices ; i++) {
mo->index((Ogre::uint32)(indices[i]));
}
mo->end();
}