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Introduced workaround for problem of text that is scaled in screen coords, but hasn't been rendered yet

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so doesn't have knowledge of screen space yet, so assume that scaling is 1 rather than 0 as was previously
assumed in the previous handling of screen space text.
This commit is contained in:
Robert Osfield 2011-07-20 09:10:32 +00:00
parent 695fcda726
commit 1838707627
1 changed files with 10 additions and 4 deletions
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14
src/osgText/TextBase.cpp
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@ -287,11 +287,17 @@ osg::BoundingBox TextBase::computeBound() const
if (!bbox.valid())
{
// provide a fallback in cases where no bounding box has been been setup so far
if (_characterSizeMode!=OBJECT_COORDS || _autoRotateToScreen)
// Provide a fallback in cases where no bounding box has been been setup so far.
// Note, assume a scaling of 1.0 for _characterSizeMode!=OBJECT_COORDS as the
// for screen space coordinates size modes we don't know what scale will be used until
// the text is actually rendered, but we haven't to assume something otherwise the
// text label will be culled by view or small feature culling on first frame.
if (_autoRotateToScreen)
{
// default to a zero size.
bbox.set(_position, _position);
// use bounding sphere encompassing the maximum size of the text centered on the _position
double radius = _textBB.radius();
osg::Vec3 diagonal(radius, radius, radius);
bbox.set(_position-diagonal, _position+diagonal);
}
else
{