Hi,
I want to draw a half cone.
I have the code to draw an entire cone :
osg::ref_ptr<osg::Geometry> geom = new osg::Geometry();
osg::Vec3Array* normals = new osg::Vec3Array;
osg::Vec2Array* tcoords = new osg::Vec2Array;
osg::Vec3Array* vertices = new osg::Vec3Array;
unsigned int numSegments = 20;
unsigned int numRows = 10;
float ratio = 1.0f;
float r = rayon;
float h = hauteur;
float normalz = r/(sqrtf(r*r+h*h));
float normalRatio = 1.0f/(sqrtf(1.0f+normalz*normalz));
normalz *= normalRatio;
float angleDelta = 2.0f*osg::PI/(float)numSegments;
float texCoordHorzDelta = 1.0/(float)numSegments;
float texCoordRowDelta = 1.0/(float)numRows;
float hDelta = hauteur/(float)numRows;
float rDelta = rayon/(float)numRows;
float topz=hauteur;
float topr=0.0f;
float topv=1.0f;
float basez=topz-hDelta;
float baser=rDelta;
float basev=topv-texCoordRowDelta;
float angle;
float texCoord;
for(unsigned int rowi=0; rowi<numRows;
++rowi,topz=basez, basez-=hDelta, topr=baser, baser+=rDelta,
topv=basev, basev-=texCoordRowDelta) {
angle = 0.0f;
texCoord = 0.0f;
for(unsigned int topi=0; topi<numSegments;
++topi,angle+=angleDelta,texCoord+=texCoordHorzDelta) {
float c = cosf(angle);
float s = sinf(angle);
normals->push_back(osg::Vec3f(c*normalRatio,s*normalRatio,normalz));
tcoords->push_back(osg::Vec2f(texCoord,topv));
vertices->push_back(osg::Vec3f(c*topr,s*topr,topz));
tcoords->push_back(osg::Vec2f(texCoord,basev));
vertices->push_back(osg::Vec3f(c*baser,s*baser,basez));
}
normals->push_back(osg::Vec3f(normalRatio,0.0f,normalz));
tcoords->push_back(osg::Vec2f(1.0f,topv));
vertices->push_back(osg::Vec3f(topr,0.0f,topz));
tcoords->push_back(osg::Vec2f(1.0f,basev));
vertices->push_back(osg::Vec3f(baser,0.0f,basez));
}
geom->setVertexArray(vertices);
osg::Vec4Array* colors = new osg::Vec4Array;
colors->push_back(osg::Vec4f(0.0,1.0,1.0,1.0));
geom->setColorArray(colors);
geom->setColorBinding(osg::Geometry::BIND_OVERALL);
geom->setNormalArray(normals);
geom->setTexCoordArray(0,tcoords);
geom->addPrimitiveSet(new
osg::DrawArrays(osg::PrimitiveSet::QUAD_STRIP,0,vertices->size()));
But I can't draw a half-cone.
Can you help me?
Thank you!
Cheers,
lucie
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Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=35703#35703
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