167 lines
3.2 KiB
C++
167 lines
3.2 KiB
C++
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#include <math.h>
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#include <osg/GL>
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#include <osg/Group>
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#include <osg/Geode>
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#include <osg/Geometry>
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#include <osg/Texture2D>
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#include <osg/TexEnv>
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#include <osg/StateSet>
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#include <osg/Matrix>
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#include <osgDB/ReadFile>
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#ifdef _MSC_VER
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#pragma warning( disable : 4244 )
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#pragma warning( disable : 4305 )
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#endif
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using namespace osg;
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extern void getDatabaseCenterRadius( float dbcenter[3], float *dbradius );
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static float radius = 2.0;
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static float dbcenter[3], dbradius;
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static void conv( const Vec3& a, const Matrix& mat, Vec3& b )
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{
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int i;
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Vec3 t;
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for( i = 0; i < 3; i++ )
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{
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t[i] = (a[0] * mat(0,i)) +
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(a[1] * mat(1,i)) +
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(a[2] * mat(2,i)) +
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mat(3,i);
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}
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b[0] = t[0];
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b[1] = t[1];
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b[2] = t[2];
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}
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Node *makeTank( void )
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{
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Geode *geode = new Geode;
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getDatabaseCenterRadius( dbcenter, &dbradius );
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Matrix mat(
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0.05, 0, 0, 0,
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0, 0.05, 0, 0,
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0, 0, 0.05, 0,
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1.5999 - 0.3,
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3.1474,
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dbcenter[2] + 0.6542 - 0.09,
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1
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);
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// 42 required for sodes, 22 for the top.
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Vec3Array& vc = *(new Vec3Array(42+22));
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Vec2Array& tc = *(new Vec2Array(42+22));
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Geometry *gset = new Geometry;
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gset->setVertexArray( &vc );
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gset->setTexCoordArray( 0, &tc );
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// create the sides of the tank.
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unsigned int i, c = 0;
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for( i = 0; i <= 360; i += 18 )
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{
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float x, y, z;
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float s, t;
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float theta = osg::DegreesToRadians((float)i);
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s = (float)i/90.0;
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t = 1.0;
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x = radius * cosf( theta );
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y = radius * sinf( theta );
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z = 1.0;
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vc[c][0] = x;
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vc[c][1] = y;
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vc[c][2] = z;
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tc[c][0] = s;
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tc[c][1] = t;
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c++;
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t = 0.0;
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z = 0.0;
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vc[c][0] = x;
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vc[c][1] = y;
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vc[c][2] = z;
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tc[c][0] = s;
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tc[c][1] = t;
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c++;
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}
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gset->addPrimitiveSet( new DrawArrays(PrimitiveSet::TRIANGLE_STRIP,0,c) );
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// create the top of the tank.
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int prev_c = c;
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vc[c][0] = 0.0f;
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vc[c][1] = 0.0f;
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vc[c][2] = 1.0f;
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tc[c][0] = 0.0f;
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tc[c][1] = 0.0f;
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c++;
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for( i = 0; i <= 360; i += 18 )
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{
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float x, y, z;
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float s, t;
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float theta = osg::DegreesToRadians((float)i);
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// s = (float)i/360.0;
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// t = 1.0;
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s = cosf( theta );
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t = sinf( theta );
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x = radius * cosf( theta );
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y = radius * sinf( theta );
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z = 1.0;
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vc[c][0] = x;
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vc[c][1] = y;
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vc[c][2] = z;
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tc[c][0] = s;
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tc[c][1] = t;
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c++;
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}
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for( i = 0; i < c; i++ )
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conv( vc[i], mat, vc[i] );
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gset->addPrimitiveSet(new DrawArrays(PrimitiveSet::TRIANGLE_FAN,prev_c,c-prev_c));
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Texture2D *tex = new Texture2D;
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tex->setWrap( Texture2D::WRAP_S, Texture2D::REPEAT );
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tex->setWrap( Texture2D::WRAP_T, Texture2D::REPEAT );
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tex->setImage(osgDB::readImageFile("Images/tank.rgb"));
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StateSet *dstate = new StateSet;
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dstate->setTextureAttributeAndModes(0, tex, StateAttribute::ON );
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dstate->setTextureAttribute(0, new TexEnv );
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gset->setStateSet( dstate );
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geode->addDrawable( gset );
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return geode;
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}
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