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Merged from svn/trunk, workaround to culling issues assocaited with text that is set to scale relative to screen coords or is rotated to the screen.

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Robert Osfield
2011-07-21 09:19:45 +00:00
parent 1753cad35f
commit 90afef26bb
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
{