// Functor supplies triangles to things like IntersectionVisitor, ComputeBoundsVisitor, etc.
void
TileDrawable::accept(osg::PrimitiveFunctor& f) const
{
const osg::Vec3Array& verts = *static_cast<osg::Vec3Array*>(_geom->getVertexArray());
const osg::Vec3Array& normals = *static_cast<osg::Vec3Array*>(_geom->getNormalArray());
#if 1 // triangles (OSG-stats-friendly)
//TODO: improve by caching the entire Vec3f, not just the height.
f.begin(GL_TRIANGLES);
for(int t=0; t<_tileSize-1; ++t)
{
for(int s=0; s<_tileSize-1; ++s)
{
int i00 = t*_tileSize + s;
int i10 = i00 + 1;
int i01 = i00 + _tileSize;
int i11 = i01 + 1;
osg::Vec3d v01 = verts[i01] + normals[i01] * _heightCache[i01];
osg::Vec3d v10 = verts[i10] + normals[i10] * _heightCache[i10];
f.vertex( verts[i00] + normals[i00] * _heightCache[i00] );
f.vertex( v01 );
f.vertex( v10 );
f.vertex( v10 );
f.vertex( v01 );
f.vertex( verts[i11] + normals[i11] * _heightCache[i11] );
}
}
f.end();
#else
// triangle-strips (faster? but not stats-friendly; will cause the OSG stats
// to report _tileSize-1 primitive sets per TileDrawable even though there
// is only one.
for(int t=0; t<_tileSize-1; ++t)
{
f.begin( GL_TRIANGLE_STRIP );
for(int s=0; s<_tileSize; ++s)
{
int i = t*_tileSize + s;
f.vertex( verts[i] + normals[i] * _heightCache[i] );
i += _tileSize;
f.vertex( verts[i] + normals[i] * _heightCache[i] );
}
f.end();
}
#endif
}
// Functor supplies triangles to things like IntersectionVisitor, ComputeBoundsVisitor, etc.
void
TileDrawable::accept(osg::PrimitiveFunctor& f) const
{
#if 1 // triangles (OSG-stats-friendly)
//TODO: improve by caching the entire Vec3f, not just the height.
f.begin(GL_TRIANGLES);
for(int t=0; t<_tileSize-1; ++t)
{
for(int s=0; s<_tileSize-1; ++s)
{
int i00 = t*_tileSize + s;
int i10 = i00 + 1;
int i01 = i00 + _tileSize;
int i11 = i01 + 1;
f.vertex(_mesh[i00]); f.vertex(_mesh[i01]); f.vertex(_mesh[i10]);
f.vertex(_mesh[i10]); f.vertex(_mesh[i01]); f.vertex(_mesh[i11]);
}
}
f.end();
#else
// triangle-strips (faster? but not stats-friendly; will cause the OSG stats
// to report _tileSize-1 primitive sets per TileDrawable even though there
// is only one.
for(int t=0; t<_tileSize-1; ++t)
{
f.begin( GL_TRIANGLE_STRIP );
for(int s=0; s<_tileSize; ++s)
{
int i = t*_tileSize + s;
f.vertex( _mesh[i] );
i += _tileSize;
f.vertex( _mesh[i] );
}
f.end();
}
#endif
}
void
TileDrawable::accept(osg::PrimitiveFunctor& f) const
{
if ( !_elevationRaster.valid() )
return;
const osg::Vec3Array* verts = static_cast<osg::Vec3Array*>(_geom->getVertexArray());
const osg::Vec3Array* normals = static_cast<osg::Vec3Array*>(_geom->getNormalArray());
ImageUtils::PixelReader elevation(_elevationRaster.get());
float
scaleU = _elevationScaleBias(0,0),
scaleV = _elevationScaleBias(1,1),
biasU = _elevationScaleBias(3,0),
biasV = _elevationScaleBias(3,1);
for(int t=0; t<_tileSize-1; ++t)
{
float v = (float)t / (float)(_tileSize-1);
float v1 = (float)(t+1) / (float)(_tileSize-1);
f.begin( GL_QUAD_STRIP );
for(int s=0; s<_tileSize; ++s)
{
float u = (float)s / (float)(_tileSize-1);
int index = t*_tileSize + s;
{
const osg::Vec3f& vert = (*verts)[index];
const osg::Vec3f& normal = (*normals)[index];
float h = elevation(u*scaleU+biasU, v*scaleV+biasV).r();
f.vertex( vert + normal*h );
}
index += _tileSize;
{
const osg::Vec3f& vert = (*verts)[index];
const osg::Vec3f& normal = (*normals)[index];
float h = elevation(u*scaleU+biasU, v1*scaleV+biasV).r();
f.vertex( vert + normal*h );
}
}
f.end();
}
}
void
TileDrawable::accept(osg::PrimitiveFunctor& f) const
{
const osg::Vec3Array* verts = static_cast<osg::Vec3Array*>(_geom->getVertexArray());
const osg::Vec3Array* normals = static_cast<osg::Vec3Array*>(_geom->getNormalArray());
if ( _elevationRaster.valid() )
{
ImageUtils::PixelReader elevation(_elevationRaster.get());
elevation.setBilinear(true);
float
scaleU = _elevationScaleBias(0,0),
scaleV = _elevationScaleBias(1,1),
biasU = _elevationScaleBias(3,0),
biasV = _elevationScaleBias(3,1);
//float
// texelScale = (float)(_elevationRaster->s()-1)/(float)_elevationRaster->s(),
// texelBias = 0.5f/(float)(_elevationRaster->s());
if ( osg::equivalent(scaleU, 0.0f) || osg::equivalent(scaleV, 0.0f) )
{
OE_WARN << LC << "Precision loss in tile " << _key.str() << "\n";
}
for(int t=0; t<_tileSize-1; ++t)
{
float v0 = (float)t / (float)(_tileSize-1);
float v1 = (float)(t+1) / (float)(_tileSize-1);
v0 = v0*scaleV + biasV;
v1 = v1*scaleV + biasV;
f.begin( GL_QUAD_STRIP );
for(int s=0; s<_tileSize; ++s)
{
float u = (float)s / (float)(_tileSize-1);
u = u*scaleU + biasU;
int index = t*_tileSize + s;
{
const osg::Vec3f& vert = (*verts)[index];
const osg::Vec3f& normal = (*normals)[index];
float h = elevation(u, v0).r();
f.vertex( vert + normal*h );
}
index += _tileSize;
{
const osg::Vec3f& vert = (*verts)[index];
const osg::Vec3f& normal = (*normals)[index];
float h = elevation(u, v1).r();
f.vertex( vert + normal*h );
}
}
f.end();
}
}
// no elevation
else
{
for(int t=0; t<_tileSize-1; ++t)
{
f.begin( GL_QUAD_STRIP );
for(int s=0; s<_tileSize; ++s)
{
int index = t*_tileSize + s;
f.vertex( (*verts)[index] );
f.vertex( (*verts)[index + _tileSize] );
}
f.end();
}
}
}
