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Add osgUtil::Simplifier to allow terrain simplification.

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This commit is contained in:
Stuart Buchanan 2014-02-23 21:09:09 +00:00
parent 32a6bd78d8
commit 3429e00721
1 changed files with 113 additions and 10 deletions
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121
simgear/scene/tgdb/obj.cxx
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@ -41,6 +41,8 @@
#include <osg/StateSet>
#include <osg/Switch>
#include <osgUtil/Simplifier>
#include <boost/foreach.hpp>
#include <algorithm>
@ -70,9 +72,14 @@
#include "SGDirectionalLightBin.hxx"
#include "GroundLightManager.hxx"
#include "pt_lights.hxx"
#define SG_SIMPLIFIER_RATIO 0.001
#define SG_SIMPLIFIER_MAX_LENGTH 1000.0
#define SG_SIMPLIFIER_MAX_ERROR 2000.0
#define SG_OBJECT_RANGE 9000.0
#define SG_TILE_RADIUS 14000.0
using namespace simgear;
typedef std::map<std::string,SGTexturedTriangleBin> SGMaterialTriangleMap;
@ -891,6 +898,10 @@ public:
group->setName("Random Object and Lighting Group");
group->setDataVariance(osg::Object::STATIC);
osg::Node* node = loadTerrain();
if (node)
group->addChild(node);
osg::LOD* lightLOD = generateLightingTileObjects();
if (lightLOD)
group->addChild(lightLOD);
@ -902,6 +913,64 @@ public:
return group.release();
}
// Load terrain if required
osg::Node* loadTerrain()
{
if (! _loadterrain)
return NULL;
SGBinObject tile;
if (!tile.read_bin(_path))
return NULL;
SGMaterialLibPtr matlib;
bool useVBOs = false;
bool simplifyNear = false;
double ratio = SG_SIMPLIFIER_RATIO;
double maxLength = SG_SIMPLIFIER_MAX_LENGTH;
double maxError = SG_SIMPLIFIER_MAX_ERROR;
if (_options) {
matlib = _options->getMaterialLib();
useVBOs = (_options->getPluginStringData("SimGear::USE_VBOS") == "ON");
SGPropertyNode* propertyNode = _options->getPropertyNode().get();
simplifyNear = propertyNode->getBoolValue("/sim/rendering/terrain/simplifier/enabled-near", simplifyNear);
ratio = propertyNode->getDoubleValue("/sim/rendering/terrain/simplifier/ratio", ratio);
maxLength = propertyNode->getDoubleValue("/sim/rendering/terrain/simplifier/max-length", maxLength);
maxError = propertyNode->getDoubleValue("/sim/rendering/terrain/simplifier/max-error", maxError);
}
SGVec3d center = tile.get_gbs_center();
SGGeod geodPos = SGGeod::fromCart(center);
SGQuatd hlOr = SGQuatd::fromLonLat(geodPos)*SGQuatd::fromEulerDeg(0, 0, 180);
// rotate the tiles so that the bounding boxes get nearly axis aligned.
// this will help the collision tree's bounding boxes a bit ...
std::vector<SGVec3d> nodes = tile.get_wgs84_nodes();
for (unsigned i = 0; i < nodes.size(); ++i)
nodes[i] = hlOr.transform(nodes[i]);
tile.set_wgs84_nodes(nodes);
SGQuatf hlOrf(hlOr[0], hlOr[1], hlOr[2], hlOr[3]);
std::vector<SGVec3f> normals = tile.get_normals();
for (unsigned i = 0; i < normals.size(); ++i)
normals[i] = hlOrf.transform(normals[i]);
tile.set_normals(normals);
osg::ref_ptr<SGTileGeometryBin> tileGeometryBin = new SGTileGeometryBin;
if (!tileGeometryBin->insertBinObj(tile, matlib))
return NULL;
osg::Node* node = tileGeometryBin->getSurfaceGeometry(matlib, useVBOs);
if (node && simplifyNear) {
osgUtil::Simplifier simplifier(ratio, maxError, maxLength);
node->accept(simplifier);
}
return node;
}
// Generate all the lighting objects for the tile.
osg::LOD* generateLightingTileObjects()
{
@ -1172,6 +1241,8 @@ public:
/// The original options to use for this bunch of models
osg::ref_ptr<SGReaderWriterOptions> _options;
osg::ref_ptr<SGTileGeometryBin> _tileGeometryBin;
string _path;
bool _loadterrain;
};
osg::Node*
@ -1182,12 +1253,28 @@ SGLoadBTG(const std::string& path, const simgear::SGReaderWriterOptions* options
return NULL;
SGMaterialLibPtr matlib;
bool useVBOs = false;
bool simplifyDistant = false;
bool simplifyNear = false;
double ratio = SG_SIMPLIFIER_RATIO;
double maxLength = SG_SIMPLIFIER_MAX_LENGTH;
double maxError = SG_SIMPLIFIER_MAX_ERROR;
double object_range = SG_OBJECT_RANGE;
if (options) {
matlib = options->getMaterialLib();
}
useVBOs = (options->getPluginStringData("SimGear::USE_VBOS") == "ON");
SGPropertyNode* propertyNode = options->getPropertyNode().get();
bool useVBOs = (options->getPluginStringData("SimGear::USE_VBOS") == "ON");
// We control whether we simplify the nearby terrain and distant terrain separatey.
// However, we don't allow only simplifying the near terrain!
simplifyNear = propertyNode->getBoolValue("/sim/rendering/terrain/simplifier/enabled-near", simplifyNear);
simplifyDistant = simplifyNear || propertyNode->getBoolValue("/sim/rendering/terrain/simplifier/enabled-far", simplifyDistant);
ratio = propertyNode->getDoubleValue("/sim/rendering/terrain/simplifier/ratio", ratio);
maxLength = propertyNode->getDoubleValue("/sim/rendering/terrain/simplifier/max-length", maxLength);
maxError = propertyNode->getDoubleValue("/sim/rendering/terrain/simplifier/max-error", maxError);
object_range = propertyNode->getDoubleValue("/sim/rendering/static-lod/rough", object_range);
}
SGVec3d center = tile.get_gbs_center();
SGGeod geodPos = SGGeod::fromCart(center);
@ -1211,19 +1298,18 @@ SGLoadBTG(const std::string& path, const simgear::SGReaderWriterOptions* options
if (!tileGeometryBin->insertBinObj(tile, matlib))
return NULL;
osg::Group* terrainGroup = new osg::Group;
terrainGroup->setName("BTGTerrainGroup");
osg::Node* node = tileGeometryBin->getSurfaceGeometry(matlib, useVBOs);
if (node)
terrainGroup->addChild(node);
if (node && simplifyDistant) {
osgUtil::Simplifier simplifier(ratio, maxError, maxLength);
node->accept(simplifier);
}
// The toplevel transform for that tile.
osg::MatrixTransform* transform = new osg::MatrixTransform;
transform->setName(path);
transform->setMatrix(osg::Matrix::rotate(toOsg(hlOr))*
osg::Matrix::translate(toOsg(center)));
transform->addChild(terrainGroup);
// PagedLOD for the random objects so we don't need to generate
// them all on tile loading.
@ -1231,17 +1317,34 @@ SGLoadBTG(const std::string& path, const simgear::SGReaderWriterOptions* options
pagedLOD->setCenterMode(osg::PagedLOD::USE_BOUNDING_SPHERE_CENTER);
pagedLOD->setName("pagedObjectLOD");
if (node) {
if (simplifyNear == simplifyDistant) {
// Same terrain type is used for both near and far distances,
// so add it to the main group.
osg::Group* terrainGroup = new osg::Group;
terrainGroup->setName("BTGTerrainGroup");
terrainGroup->addChild(node);
transform->addChild(terrainGroup);
} else if (simplifyDistant) {
// Simplified terrain is only used in the distance, the
// call-back below will re-generate the closer version
pagedLOD->addChild(node, object_range + SG_TILE_RADIUS, FLT_MAX);
}
}
// we just need to know about the read file callback that itself holds the data
osg::ref_ptr<RandomObjectCallback> randomObjectCallback = new RandomObjectCallback;
randomObjectCallback->_options = SGReaderWriterOptions::copyOrCreate(options);
randomObjectCallback->_tileGeometryBin = tileGeometryBin;
randomObjectCallback->_path = std::string(path);
randomObjectCallback->_loadterrain = ! (simplifyNear == simplifyDistant);
osg::ref_ptr<osgDB::Options> callbackOptions = new osgDB::Options;
callbackOptions->setReadFileCallback(randomObjectCallback.get());
pagedLOD->setDatabaseOptions(callbackOptions.get());
pagedLOD->setFileName(pagedLOD->getNumChildren(), "Dummy name - use the stored data in the read file callback");
pagedLOD->setRange(pagedLOD->getNumChildren(), 0, 35000);
pagedLOD->setRange(pagedLOD->getNumChildren(), 0, object_range + SG_TILE_RADIUS);
transform->addChild(pagedLOD);
transform->setNodeMask( ~simgear::MODELLIGHT_BIT );