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From Geoff Michel, new osgtesselate example, and new features in osgUtil::Tesselator.

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This commit is contained in:
Robert Osfield
2004-08-01 10:36:02 +00:00
parent 4d9bd4d825
commit f206abcd43
8 changed files with 1486 additions and 236 deletions
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18
examples/osgtesselate/GNUmakefile Normal file
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TOPDIR = ../..
include $(TOPDIR)/Make/makedefs
CXXFILES =\
osgtesselate.cpp\
LIBS += -losgProducer -lProducer -losgText -losgGA -losgDB -losgUtil -losg $(GL_LIBS) $(X_LIBS) $(OTHER_LIBS)
INSTFILES = \
$(CXXFILES)\
GNUmakefile.inst=GNUmakefile
EXEC = osgtesselate
INC += $(X_INC)
include $(TOPDIR)/Make/makerules

13
examples/osgtesselate/GNUmakefile.inst Normal file
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TOPDIR = ../..
include $(TOPDIR)/Make/makedefs
CXXFILES =\
osgtesselate.cpp\
LIBS += -losgProducer -lProducer -losgDB -losgText -losgUtil -losg $(GL_LIBS) $(X_LIBS) $(OTHER_LIBS)
EXEC = osgtesselate
INC += $(X_INC)
include $(TOPDIR)/Make/makerules

774
examples/osgtesselate/osgtesselate.cpp Normal file
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/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2003 Robert Osfield
*
* This application is open source and may be redistributed and/or modified
* freely and without restriction, both in commericial and non commericial applications,
* as long as this copyright notice is maintained.
*
* This application is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
*/
/* osgtesselator
* - this tesselator is an extension of the basic one - rather than tesselating
* individual polygons, we tesselate the entire geode with multiple contours.
* allows for overlapping contours etc.
* the tesselator has new member fuinctions
setTesselationType(osgUtil::Tesselator::TESS_TYPE_xxx);
tscx->setBoundaryOnly(bool);
tscx->setWindingType( osgUtil::Tesselator::TESS_WINDING_xxx);
* for winding rules: See the red book chap 13.
*/
#include <osgDB/ReadFile>
#include <osgUtil/Optimizer>
#include <osgProducer/Viewer>
#include <osg/Projection>
#include <osg/MatrixTransform>
#include <osgText/Text>
#include <osgUtil/Tesselator> // to tesselate multiple contours
class tesselateDemoGeometry : public osg::Geometry, public osgUtil::Tesselator {
// We add the Tesselator to the geometry because we want to access the
// tesselatable contours again; you can apply a tesselator to a Geometry
// to produce exactly a required tesselation once only, and then
// the contours could be discarded since the geometry does not need to be retesselated.
public:
tesselateDemoGeometry() {};
protected:
virtual ~tesselateDemoGeometry() {};
};
osg::Geometry *makePolsTwo (void) {
// an example of using current geometry contours to create next tesselation
// this polygon disappears once the contour rules make no polygons.
tesselateDemoGeometry *gtess= new tesselateDemoGeometry;
int i;
osg::Vec3Array *coords = new osg::Vec3Array;
osg::Vec3Array *nrms = new osg::Vec3Array;
osg::Vec2Array *tcs = new osg::Vec2Array;
osg::Vec3 nrm(0,-1,0);
static GLdouble quadstrip[8][3] =
{1900.0, 1130.0, 0.0, 2100.0, 1130.0, 0.0,
1900.0, 1350.0, 0.0, 1950.0, 1350.0, 0.0,
1900.0, 1550.0, 0.0, 2000.0, 1550.0, 0.0,
1900.0, 1750.0, 0.0, 2400.0, 1750.0, 0.0};
static GLdouble innerquadstrip[8][3] =
{2000.0, 1230.0, 0.0, 2050.0, 1230.0, 0.0,
1920.0, 1350.0, 0.0, 1940.0, 1350.0, 0.0,
1920.0, 1550.0, 0.0, 1980.0, 1550.0, 0.0,
2000.0, 1650.0, 0.0, 2400.0, 1650.0, 0.0};
// add one large quadstrip
for (i = 0; i < 8; i++) {
coords->push_back(osg::Vec3(quadstrip[i][0],quadstrip[i][2],quadstrip[i][1]));
tcs->push_back(osg::Vec2(quadstrip[i][0],quadstrip[i][1])/200.0);
nrms->push_back(nrm);
}
for (i = 0; i < 8; i++) {
coords->push_back(osg::Vec3(innerquadstrip[i][0],innerquadstrip[i][2],innerquadstrip[i][1]));
tcs->push_back(osg::Vec2(innerquadstrip[i][0],innerquadstrip[i][1])/200.0);
nrms->push_back(nrm);
}
gtess->setVertexArray(coords);
gtess->setNormalArray(nrms);
gtess->setTexCoordArray(0,tcs);
// demonstrate that the tesselator makes textured tesselations
osg::StateSet* stateset = new osg::StateSet();
osg::Image* image = osgDB::readImageFile("Images/osg_posy.png");
if (image)
{
osg::Texture2D* texture = new osg::Texture2D;
texture->setImage(image);
stateset->setTextureAttributeAndModes(0,texture,osg::StateAttribute::ON);
}
gtess->setStateSet( stateset );
int nstart=0;
// The derived class tesselateDemoGeometry retains the original contours for re-use.
gtess->addPrimitiveSet(new osg::DrawArrays(osg::PrimitiveSet::TRIANGLE_STRIP,nstart,8));nstart+=8;
gtess->addPrimitiveSet(new osg::DrawArrays(osg::PrimitiveSet::TRIANGLE_STRIP,nstart,8));nstart+=8;
gtess->setTesselationType(osgUtil::Tesselator::TESS_TYPE_GEOMETRY);
gtess->setBoundaryOnly(true);
gtess->setWindingType( osgUtil::Tesselator::TESS_WINDING_ABS_GEQ_TWO); // so that first change in wind type makes the commonest tesselation - ODD.
return gtess;
}
osg::Geometry *makeSideWall (const float xpos) {
// demonstrate making a rectangular 'wall' with 2 holes in it.
osg::Geometry *gtess= new osg::Geometry;
int i;
osg::Vec3Array *coords = new osg::Vec3Array;
osg::Vec3Array *nrms = new osg::Vec3Array;
osg::Vec2Array *tcs = new osg::Vec2Array;
osg::Vec3 nrm(0,0,-1);
// front wall
static GLdouble wall[4][2] =
{ 1130.0, 0.0, 1130.0, 300.0,
1340.0,300.0, 1340.0,0.0};
gtess->setVertexArray(coords);
gtess->setNormalArray(nrms);
gtess->setTexCoordArray(0,tcs);
for (i = 0; i < 4; i++) {
coords->push_back(osg::Vec3(xpos,wall[i][1],wall[i][0]));
tcs->push_back(osg::Vec2(wall[i][1],wall[i][0])/100.0);
nrms->push_back(nrm);
}
int nstart=0;
gtess->addPrimitiveSet(new osg::DrawArrays(osg::PrimitiveSet::QUADS,nstart,4));nstart+=4;
for (i = 0; i < 24; i++) { // make an ellipse hole
float y=150+50*cos(i*2*osg::PI/24.0);
float z=1300+30* sin(i*2*osg::PI/24.0);
coords->push_back(osg::Vec3(xpos,y,z));
tcs->push_back(osg::Vec2(y,z)/100.0);
nrms->push_back(nrm);
}
gtess->addPrimitiveSet(new osg::DrawArrays(osg::PrimitiveSet::POLYGON,nstart,24));nstart+=24;
for (i = 0; i < 5; i++) { // make a pentagonal hole
float y=150+50*cos(i*2*osg::PI/5.0);
float z=1200+40* sin(i*2*osg::PI/5.0);
coords->push_back(osg::Vec3(xpos,y,z));
tcs->push_back(osg::Vec2(y,z)/100.0);
nrms->push_back(nrm);
}
gtess->addPrimitiveSet(new osg::DrawArrays(osg::PrimitiveSet::POLYGON,nstart,5));nstart+=5;
// demonstrate that the tesselator makes textured tesselations
osg::StateSet* stateset = new osg::StateSet();
osg::Image* image = osgDB::readImageFile("Images/osg_posx.png");
if (image)
{
osg::Texture2D* texture = new osg::Texture2D;
texture->setImage(image);
stateset->setTextureAttributeAndModes(0,texture,osg::StateAttribute::ON);
}
gtess->setStateSet( stateset );
osg::ref_ptr<osgUtil::Tesselator> tscx=new osgUtil::Tesselator; // the v1.2 multi-contour tesselator.
// we use the geometry primitives to describe the contours which are tesselated.
// Winding odd means leave hole in surface where there are 2,4,6... contours circling the point.
tscx->setTesselationType(osgUtil::Tesselator::TESS_TYPE_GEOMETRY);
tscx->setBoundaryOnly(false);
tscx->setWindingType( osgUtil::Tesselator::TESS_WINDING_ODD); // so that first change in wind type makes the commonest tesselation - ODD.
tscx->retesselatePolygons(*gtess);
return gtess;
}
osg::Geometry *makeFrontWall (const float zpos) {
// an example of using one tesselation to make a 'house' wall
// describe the wall as a pentagon, then door & 4 windows are further contours
// tesselate the set of contours to make a 'house wall' from the Boolean-like operations.
int nstart=0; // counts vertices used for the geometry primitives
osg::Geometry *gtess= new osg::Geometry;
int i;
osg::Vec3Array *coords = new osg::Vec3Array;
osg::Vec3Array *nrms = new osg::Vec3Array;
osg::Vec2Array *tcs = new osg::Vec2Array;
osg::Vec3 nrm(0,0,-1);
// front wall
static GLdouble wall[5][2] =
{2200.0, 1130.0, 2600.0, 1130.0,
2600.0, 1340.0, 2400.0, 1440.0, 2200.0, 1340.0};
static GLdouble door[4][2] =
{2360.0, 1130.0, 2440.0, 1130.0,
2440.0, 1230.0, 2360.0, 1230.0};
static GLdouble windows[16][2] =
{2240.0, 1180.0, 2330.0, 1180.0,
2330.0, 1220.0, 2240.0, 1220.0,
2460.0, 1180.0, 2560.0, 1180.0,
2560.0, 1220.0, 2460.0, 1220.0,
2240.0, 1280.0, 2330.0, 1280.0,
2330.0, 1320.0, 2240.0, 1320.0,
2460.0, 1280.0, 2560.0, 1280.0,
2560.0, 1320.0, 2460.0, 1320.0};
gtess->setVertexArray(coords);
gtess->setNormalArray(nrms);
gtess->setTexCoordArray(0,tcs);
// add one large pentagon -the wall
for (i = 0; i < 5; i++) {
coords->push_back(osg::Vec3(wall[i][0],zpos,wall[i][1]));
tcs->push_back(osg::Vec2(wall[i][0],wall[i][1])/100.0);
nrms->push_back(nrm);
}
gtess->addPrimitiveSet(new osg::DrawArrays(osg::PrimitiveSet::POLYGON,nstart,5));nstart+=5;
// add first hole, a door
for (i = 0; i < 4; i++) {
coords->push_back(osg::Vec3(door[i][0],zpos,door[i][1]));
tcs->push_back(osg::Vec2(door[i][0],door[i][1])/100.0);
nrms->push_back(nrm);
}
// and windows
for (i = 0; i < 16; i++) {
coords->push_back(osg::Vec3(windows[i][0],zpos,windows[i][1]));
tcs->push_back(osg::Vec2(windows[i][0],windows[i][1])/100.0);
nrms->push_back(nrm);
}
gtess->addPrimitiveSet(new osg::DrawArrays(osg::PrimitiveSet::QUADS,nstart,20));nstart+=20;
// demonstrate that the tesselator makes textured tesselations
osg::StateSet* stateset = new osg::StateSet();
osg::Image* image = osgDB::readImageFile("Images/osg_posy.png");
if (image)
{
osg::Texture2D* texture = new osg::Texture2D;
texture->setImage(image);
stateset->setTextureAttributeAndModes(0,texture,osg::StateAttribute::ON);
}
gtess->setStateSet( stateset );
// We use a Tesselator to produce the tesselation required once only
// and the contours are discarded.
osg::ref_ptr<osgUtil::Tesselator> tscx=new osgUtil::Tesselator; // the v1.2 multi-contour tesselator.
tscx->setTesselationType(osgUtil::Tesselator::TESS_TYPE_GEOMETRY);
tscx->setBoundaryOnly(false);
tscx->setWindingType( osgUtil::Tesselator::TESS_WINDING_ODD); // so that first change in wind type makes the commonest tesselation - ODD.
tscx->retesselatePolygons(*gtess);
return gtess;
}
osg::Geode *makeHouse (void) {
osg::Geode *gd = new osg::Geode;
gd->addDrawable(makeFrontWall(0.0));
gd->addDrawable(makeFrontWall(300.0));
gd->addDrawable(makeSideWall(2200.0));
gd->addDrawable(makeSideWall(2600.0));
return gd;
}
osg::Geometry *makePols (void) {
tesselateDemoGeometry *gtess= new tesselateDemoGeometry;
int i;
osg::Vec3Array *coords = new osg::Vec3Array;
osg::Vec3Array *nrms = new osg::Vec3Array;
osg::Vec2Array *tcs = new osg::Vec2Array;
osg::Vec3 nrm(0,-1,0);
// coordinates from red book code but shifted by 1000 & 2000 for alternate tesselatory things.
static GLdouble rects[12][3] =
{50.0, 50.0, 0.0, 300.0, 50.0, 0.0,
300.0, 300.0, 0.0, 50.0, 300.0, 0.0,
100.0, 100.0, 0.0, 250.0, 100.0, 0.0,
250.0, 250.0, 0.0, 100.0, 250.0, 0.0,
150.0, 150.0, 0.0, 200.0, 150.0, 0.0,
200.0, 200.0, 0.0, 150.0, 200.0, 0.0};
static GLdouble rectsMidanti[12][3] = // the centre 2 contours are traversed opposite order to outer contour.
{1050.0, 50.0, 0.0, 1300.0, 50.0, 0.0,
1300.0, 300.0, 0.0, 1050.0, 300.0, 0.0,
1250.0, 100.0, 0.0, 1100.0, 100.0, 0.0,
1100.0, 250.0, 0.0, 1250.0, 250.0, 0.0,
1200.0, 150.0, 0.0, 1150.0, 150.0, 0.0,
1150.0, 200.0, 0.0, 1200.0, 200.0, 0.0 };
static GLdouble spiral[16][3] = // shift by 1000; nb the order of vertices is reversed from that of the red book
{3400.0, 250.0, 0.0, 3400.0, 50.0, 0.0,
3050.0, 50.0, 0.0, 3050.0, 400.0, 0.0,
3350.0, 400.0, 0.0, 3350.0, 100.0, 0.0,
3100.0, 100.0, 0.0, 3100.0, 350.0, 0.0,
3300.0, 350.0, 0.0, 3300.0, 150.0, 0.0,
3150.0, 150.0, 0.0, 3150.0, 300.0, 0.0,
3250.0, 300.0, 0.0, 3250.0, 200.0, 0.0,
3200.0, 200.0, 0.0, 3200.0, 250.0, 0.0};
static GLdouble quad1[4][3] = // shift by 2000 for next 3 things
{2050.0, 150.0, 0.0, 2350.0, 150.0, 0.0,
2350.0, 200.0, 0.0, 2050.0, 200.0, 0.0};
static GLdouble quad2[4][3] =
{2100.0, 100.0, 0.0, 2300.0, 100.0, 0.0,
2300.0, 350.0, 0.0, 2100.0, 350.0, 0.0};
static GLdouble tri[3][3] =
{2200.0, 50.0, 0.0, 2250.0, 300.0, 0.0,
2150.0, 300.0, 0.0};
static GLdouble quad3[4][3] =
{100.0, 1100.0, 0.0, 1300.0, 1100.0, 0.0,
1300.0, 2350.0, 0.0, 100.0, 2350.0, 0.0};
static GLdouble quadstrip[8][3] =
{900.0, 1130.0, 0.0, 1100.0, 1130.0, 0.0,
900.0, 1350.0, 0.0, 950.0, 1350.0, 0.0,
900.0, 1550.0, 0.0, 1000.0, 1550.0, 0.0,
900.0, 1750.0, 0.0, 1400.0, 1750.0, 0.0};
for (i = 0; i < 12; i++) {
coords->push_back(osg::Vec3(rects[i][0],rects[i][2],rects[i][1]));
tcs->push_back(osg::Vec2(rects[i][0],rects[i][1])/200.0);
nrms->push_back(nrm);
}
for (i = 0; i < 12; i++) {
coords->push_back(osg::Vec3(rectsMidanti[i][0],rectsMidanti[i][2],rectsMidanti[i][1]));
tcs->push_back(osg::Vec2(rectsMidanti[i][0],rectsMidanti[i][1])/200.0);
nrms->push_back(nrm);
}
for (i = 0; i < 16; i++) { // and reverse spiral to make same as that of red book ch 11
coords->push_back(osg::Vec3(spiral[15-i][0],spiral[15-i][2],spiral[15-i][1]));
tcs->push_back(osg::Vec2(spiral[15-i][0],spiral[15-i][1])/200.0);
nrms->push_back(nrm);
}
for (i = 0; i < 4; i++) {
coords->push_back(osg::Vec3(quad1[i][0],quad1[i][2],quad1[i][1]));
tcs->push_back(osg::Vec2(quad1[i][0],quad1[i][1])/200.0);
nrms->push_back(nrm);
}
for (i = 0; i < 4; i++) {
coords->push_back(osg::Vec3(quad2[i][0],quad2[i][2],quad2[i][1]));
tcs->push_back(osg::Vec2(quad2[i][0],quad2[i][1])/200.0);
nrms->push_back(nrm);
}
for (i = 0; i < 3; i++) {
coords->push_back(osg::Vec3(tri[i][0],tri[i][2],tri[i][1]));
tcs->push_back(osg::Vec2(tri[i][0],tri[i][1])/200.0);
nrms->push_back(nrm);
}
// add one large quad with multiple holes
for (i = 0; i < 4; i++) {
coords->push_back(osg::Vec3(quad3[i][0],quad3[i][2],quad3[i][1]));
tcs->push_back(osg::Vec2(quad3[i][0],quad3[i][1])/200.0);
nrms->push_back(nrm);
}
{
osg::Vec3 centre(300,0,1500);
for (i = 0; i < 18; i++) {
osg::Vec3 rim=centre+osg::Vec3(-cos(osg::DegreesToRadians((float)i*20.0)),0.0,sin(osg::DegreesToRadians((float)i*20.0)))*150.0;
coords->push_back(rim);
tcs->push_back(osg::Vec2(rim.x(),rim.z())/200.0);
nrms->push_back(nrm);
}
}
{
osg::Vec3 centre(400,0,1800);
for (i = 0; i < 18; i++) {
osg::Vec3 rim=centre+osg::Vec3(-cos(osg::DegreesToRadians((float)i*15.0)),0.0,sin(osg::DegreesToRadians((float)i*15.0)))*250.0;
coords->push_back(rim);
tcs->push_back(osg::Vec2(rim.x(),rim.z())/200.0);
nrms->push_back(nrm);
}
}
{
osg::Vec3 centre(600,0,1400);
for (i = 0; i < 18; i++) {
osg::Vec3 rim=centre+osg::Vec3(-cos(osg::DegreesToRadians((float)i*12.0)),0.0,sin(osg::DegreesToRadians((float)i*12.0)))*250.0;
coords->push_back(rim);
tcs->push_back(osg::Vec2(rim.x(),rim.z())/200.0);
nrms->push_back(nrm);
}
}
// add one large quadstrip
for (i = 0; i < 8; i++) {
coords->push_back(osg::Vec3(quadstrip[i][0],quadstrip[i][2],quadstrip[i][1]));
tcs->push_back(osg::Vec2(quadstrip[i][0],quadstrip[i][1])/200.0);
nrms->push_back(nrm);
}
gtess->setVertexArray(coords);
gtess->setNormalArray(nrms);
gtess->setTexCoordArray(0,tcs);
// demonstrate that the tesselator makes textured tesselations
osg::StateSet* stateset = new osg::StateSet();
osg::Image* image = osgDB::readImageFile("Images/osg_posz.png");
if (image)
{
osg::Texture2D* texture = new osg::Texture2D;
texture->setImage(image);
stateset->setTextureAttributeAndModes(0,texture,osg::StateAttribute::ON);
}
gtess->setStateSet( stateset );
int nstart=0;
// the contours accepoted are polygons; quads & tris. Trifans can bve added later.
gtess->addPrimitiveSet(new osg::DrawArrays(osg::PrimitiveSet::QUADS,nstart,12));nstart+=12;
gtess->addPrimitiveSet(new osg::DrawArrays(osg::PrimitiveSet::QUADS,nstart,12));nstart+=12;
gtess->addPrimitiveSet(new osg::DrawArrays(osg::PrimitiveSet::POLYGON,nstart,16));nstart+=16;
gtess->addPrimitiveSet(new osg::DrawArrays(osg::PrimitiveSet::QUADS,nstart,4));nstart+=4;
gtess->addPrimitiveSet(new osg::DrawArrays(osg::PrimitiveSet::QUADS,nstart,4));nstart+=4;
gtess->addPrimitiveSet(new osg::DrawArrays(osg::PrimitiveSet::TRIANGLES,nstart,3));nstart+=3;
// A rectabngle with multiple holes
gtess->addPrimitiveSet(new osg::DrawArrays(osg::PrimitiveSet::LINE_LOOP,nstart,4));nstart+=4;
gtess->addPrimitiveSet(new osg::DrawArrays(osg::PrimitiveSet::TRIANGLE_FAN,nstart,18));nstart+=18;
gtess->addPrimitiveSet(new osg::DrawArrays(osg::PrimitiveSet::POLYGON,nstart,18));nstart+=18;
gtess->addPrimitiveSet(new osg::DrawArrays(osg::PrimitiveSet::POLYGON,nstart,18));nstart+=18;
// test for quad strip
gtess->addPrimitiveSet(new osg::DrawArrays(osg::PrimitiveSet::TRIANGLE_STRIP,nstart,8));nstart+=8;
// We need to access the tesselatable contours again to demonstrate all types of tesselation.
// I could add the Tesselator to the geometry as userdata, but here
// I use the derived tesselateDemoGeometry to hold both the drawable geode and the original contours.
gtess->setTesselationType(osgUtil::Tesselator::TESS_TYPE_GEOMETRY);
gtess->setBoundaryOnly(true);
gtess->setWindingType( osgUtil::Tesselator::TESS_WINDING_ABS_GEQ_TWO); // so that first change in wind type makes the commonest tesselation - ODD.
return gtess;
}
osg::Node* createHUD()
{ // add a string reporting the type of winding rule tesselation applied
osg::Geode* geode = new osg::Geode();
std::string timesFont("fonts/arial.ttf");
// turn lighting off for the text and disable depth test to ensure its always ontop.
osg::StateSet* stateset = geode->getOrCreateStateSet();
stateset->setMode(GL_LIGHTING,osg::StateAttribute::OFF);
// Disable depth test, and make sure that the hud is drawn after everything
// else so that it always appears ontop.
stateset->setMode(GL_DEPTH_TEST,osg::StateAttribute::OFF);
stateset->setRenderBinDetails(11,"RenderBin");
osg::Vec3 position(150.0f,900.0f,0.0f);
osg::Vec3 delta(0.0f,-30.0f,0.0f);
{
osgText::Text* text = new osgText::Text;
geode->addDrawable( text );
text->setFont(timesFont);
text->setPosition(position);
text->setText("Tesselation example - no tesselation (use 'W' wireframe to visualise)");
text->setColor(osg::Vec4(1.0,1.0,0.8,1.0));
position += delta;
}
{
osgText::Text* text = new osgText::Text;
geode->addDrawable( text );
text->setFont(timesFont);
text->setPosition(position);
text->setText("Press 'n' to use an alternative tesselation.");
}
// create the hud.
osg::MatrixTransform* modelview_abs = new osg::MatrixTransform;
modelview_abs->setReferenceFrame(osg::Transform::RELATIVE_TO_ABSOLUTE);
modelview_abs->setMatrix(osg::Matrix::identity());
modelview_abs->addChild(geode);
osg::Projection* projection = new osg::Projection;
projection->setMatrix(osg::Matrix::ortho2D(0,1280,0,1024));
projection->addChild(modelview_abs);
return projection;
}
osg::Group *makeTesselateExample (void) {
osg::Group *grp=new osg::Group;
osg::Geode *gd=new osg::Geode;
gd->addDrawable(makePols());
gd->addDrawable(makePolsTwo());
grp->addChild(gd);
grp->addChild(makeHouse());
return grp;
}
class setTesselateVisitor : public osg::NodeVisitor
{ // searches a loaded model tree for tesselatable geometries.
// used with any database model which has a renderGroup (Geode) named 'tesselate'
// or you can force a type of tess with special names or a sub-class of Geode could have extra information
// of course you can use any name to detect what is to be tesselated!
// all the polygons within the specific node are deemed to be contours, so
// any tesselation can be requested.
public:
setTesselateVisitor():osg::NodeVisitor(osg::NodeVisitor::TRAVERSE_ALL_CHILDREN) {
}
virtual void apply(osg::Geode& geode) {
if (geode.getName().compare(0,9,"tesselate")==0) {
for(unsigned int i=0;i<geode.getNumDrawables();++i)
{
osg::Geometry* geom = dynamic_cast<osg::Geometry*>(geode.getDrawable(i));
if (geom) {
osg::ref_ptr<osgUtil::Tesselator> tscx=new osgUtil::Tesselator();
if (tscx.valid()) {
tscx->setTesselationType(osgUtil::Tesselator::TESS_TYPE_GEOMETRY);
if (geode.getName()== "tesselate") {
// add a tesselator so that this geom is retesselated when N is pressed
tscx->setBoundaryOnly(true);
tscx->setWindingType( osgUtil::Tesselator::TESS_WINDING_ABS_GEQ_TWO); // so that first change in wind type makes the commonest tesselation - ODD.
geom->setUserData(tscx.get());
} else if (geode.getName()== "tesselate odd") {
// OR you can just apply the tesselator once only, using these different types
tscx->setWindingType( osgUtil::Tesselator::TESS_WINDING_ODD); // commonest tesselation - ODD.
tscx->retesselatePolygons(*geom);
} else if (geode.getName()== "tesselate odd bound") {
tscx->setBoundaryOnly(true);
tscx->setWindingType( osgUtil::Tesselator::TESS_WINDING_ODD); // tesselation - ODD, only show boundary.
tscx->retesselatePolygons(*geom);
} else if (geode.getName()== "tesselate positive") {
tscx->setWindingType( osgUtil::Tesselator::TESS_WINDING_POSITIVE); // tesselation - pos.
tscx->retesselatePolygons(*geom);
} else if (geode.getName()== "tesselate positive bound") {
tscx->setBoundaryOnly(true);
tscx->setWindingType( osgUtil::Tesselator::TESS_WINDING_POSITIVE);
tscx->retesselatePolygons(*geom);
} else if (geode.getName()== "tesselate negative") {
tscx->setWindingType( osgUtil::Tesselator::TESS_WINDING_NEGATIVE);
tscx->retesselatePolygons(*geom);
} else if (geode.getName()== "tesselate negative bound") {
tscx->setBoundaryOnly(true);
tscx->setWindingType( osgUtil::Tesselator::TESS_WINDING_NEGATIVE);
tscx->retesselatePolygons(*geom);
} else if (geode.getName()== "tesselate nonzero") {
tscx->setWindingType( osgUtil::Tesselator::TESS_WINDING_NONZERO);
tscx->retesselatePolygons(*geom);
} else if (geode.getName()== "tesselate nonzero bound") {
tscx->setBoundaryOnly(true);
tscx->setWindingType( osgUtil::Tesselator::TESS_WINDING_NONZERO);
tscx->retesselatePolygons(*geom);
} else if (geode.getName()== "tesselate geq2") {
tscx->setWindingType( osgUtil::Tesselator::TESS_WINDING_ABS_GEQ_TWO);
tscx->retesselatePolygons(*geom);
} else if (geode.getName()== "tesselate geq2 bound") {
tscx->setBoundaryOnly(true);
tscx->setWindingType( osgUtil::Tesselator::TESS_WINDING_ABS_GEQ_TWO);
tscx->retesselatePolygons(*geom);
}
}
}
}
}
}
};
class cxTesselateVisitor : public osg::NodeVisitor
{ // special to this demo, traverses SG and finds nodes which have been tesselated
// for test/demo purposes these nodes are of type tesselateDemoGeometry
// but you could store the Tesselator as UserData or however you like.
// the tesselator holds copies of the original contours used in the tesselation
// In this visitor, I reuse the contours to make a different type of tesselation.
public:
cxTesselateVisitor():osg::NodeVisitor(osg::NodeVisitor::TRAVERSE_ALL_CHILDREN) {
}
virtual void apply(osg::Geode& geode) {
for(unsigned int i=0;i<geode.getNumDrawables();++i)
{
tesselateDemoGeometry *geom=dynamic_cast<tesselateDemoGeometry*>(geode.getDrawable(i));
if (geom) {
if (!geom->getBoundaryOnly()) { // turn on bounds only
// NB this shows only the true boundary of the curves, no internal edges
geom->setBoundaryOnly(true);
} else { // change to next type of tesselation...
geom->setBoundaryOnly(false);
switch (geom->getWindingType()) {
case osgUtil::Tesselator::TESS_WINDING_ODD:
geom->setWindingType(osgUtil::Tesselator::TESS_WINDING_NONZERO);
break;
case osgUtil::Tesselator::TESS_WINDING_NONZERO:
geom->setWindingType( osgUtil::Tesselator::TESS_WINDING_POSITIVE);
break;
case osgUtil::Tesselator::TESS_WINDING_POSITIVE:
geom->setWindingType( osgUtil::Tesselator::TESS_WINDING_NEGATIVE);
break;
case osgUtil::Tesselator::TESS_WINDING_NEGATIVE:
geom->setWindingType( osgUtil::Tesselator::TESS_WINDING_ABS_GEQ_TWO);
break;
case osgUtil::Tesselator::TESS_WINDING_ABS_GEQ_TWO:
geom->setWindingType( osgUtil::Tesselator::TESS_WINDING_ODD);
break;
}
}
switch (geom->getWindingType()) { // a text to be added to the scene.
case osgUtil::Tesselator::TESS_WINDING_ODD:
str="TESS_WINDING_ODD";
break;
case osgUtil::Tesselator::TESS_WINDING_NONZERO:
str="TESS_WINDING_NONZERO";
break;
case osgUtil::Tesselator::TESS_WINDING_POSITIVE:
str="TESS_WINDING_POSITIVE";
break;
case osgUtil::Tesselator::TESS_WINDING_NEGATIVE:
str="TESS_WINDING_NEGATIVE";
break;
case osgUtil::Tesselator::TESS_WINDING_ABS_GEQ_TWO:
str="TESS_WINDING_ABS_GEQ_TWO";
break;
}
if (geom->getBoundaryOnly()) str += " Boundary";
geom->retesselatePolygons(*geom);
}
osgText::Text* txt = dynamic_cast<osgText::Text*>(geode.getDrawable(i));
if (txt) {
const osg::Vec4& ct=txt->getColor(); // pick the text to be changed by its color
if (ct.z()<0.9) {
txt->setText(str.c_str());
}
}
}
traverse(geode);
}
std::string str; // a label for on screen display
};
class KeyboardEventHandler : public osgGA::GUIEventHandler
{ // extra event handler traps 'n' key to re-tesselate any tesselated geodes.
public:
KeyboardEventHandler(osg::Node *nd):
_scene(nd) {}
virtual bool handle(const osgGA::GUIEventAdapter& ea,osgGA::GUIActionAdapter&)
{
switch(ea.getEventType())
{
case(osgGA::GUIEventAdapter::KEYDOWN):
{
if (_scene && ea.getKey()=='n')
{
// re-tesselate the scene graph.
// the same contours are re-tesselated using a new method. Old contours
// & tesselation type are held internally in the derived Geode class tesselateDemoGeometry.
cxTesselateVisitor tsv;
_scene->accept(tsv);
return true;
}
break;
}
default:
break;
}
return false;
}
virtual void accept(osgGA::GUIEventHandlerVisitor& v)
{
v.visit(*this);
}
osg::Node *_scene;
};
int main( int argc, char **argv )
{
// use an ArgumentParser object to manage the program arguments.
osg::ArgumentParser arguments(&argc,argv);
// set up the usage document, in case we need to print out how to use this program.
arguments.getApplicationUsage()->setApplicationName(arguments.getApplicationName());
arguments.getApplicationUsage()->setDescription(arguments.getApplicationName()+" is the standard OpenSceneGraph example which loads and visualises 3d models.");
arguments.getApplicationUsage()->setCommandLineUsage(arguments.getApplicationName()+" [options] filename ...");
arguments.getApplicationUsage()->addCommandLineOption("-h or --help","Display this information");
// construct the viewer.
osgProducer::Viewer viewer(arguments);
// set up the value with sensible default event handlers.
viewer.setUpViewer(osgProducer::Viewer::STANDARD_SETTINGS);
// get details on keyboard and mouse bindings used by the viewer.
viewer.getUsage(*arguments.getApplicationUsage());
// if user request help write it out to cout.
if (arguments.read("-h") || arguments.read("--help"))
{
arguments.getApplicationUsage()->write(std::cout);
return 1;
}
// report any errors if they have occured when parsing the program aguments.
if (arguments.errors())
{
arguments.writeErrorMessages(std::cout);
return 1;
}
if (arguments.argc()<=1)
{
arguments.getApplicationUsage()->write(std::cout,osg::ApplicationUsage::COMMAND_LINE_OPTION);
/// return 1;
}
osg::Timer timer;
osg::Timer_t start_tick = timer.tick();
// read the scene from the list of file specified commandline args.
osg::ref_ptr<osg::Node> loadedModel = osgDB::readNodeFiles(arguments);
// if no model has been successfully loaded report failure.
if (!loadedModel)
{
loadedModel=makeTesselateExample();
} else { // if there is a loaded model:
// tesselate by searching for geode called tesselate & tesselate it
setTesselateVisitor tsv;
loadedModel->accept(tsv);
}
// create the hud.
osg::Group *gload= dynamic_cast<osg::Group *> (loadedModel.get());
gload->addChild(createHUD());
// any option left unread are converted into errors to write out later.
arguments.reportRemainingOptionsAsUnrecognized();
// report any errors if they have occured when parsing the program aguments.
if (arguments.errors())
{
arguments.writeErrorMessages(std::cout);
}
osg::Timer_t end_tick = timer.tick();
std::cout << "Time to load = "<<timer.delta_s(start_tick,end_tick)<<std::endl;
osgUtil::Optimizer optimizer;
optimizer.optimize(loadedModel.get() );
// set the scene to render
viewer.setSceneData(loadedModel.get());
// add event handler for keyboard 'n' to retesselate
viewer.getEventHandlerList().push_front(new KeyboardEventHandler(loadedModel.get()));
// create the windows and run the threads.
viewer.realize();
while( !viewer.done() )
{
// wait for all cull and draw threads to complete.
viewer.sync();
// update the scene by traversing it with the the update visitor which will
// call all node update callbacks and animations.
viewer.update();
// fire off the cull and draw traversals of the scene.
viewer.frame();
}
// wait for all cull and draw threads to complete before exit.
viewer.sync();
return 0;
}