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#ifndef OPENMW_COMPONENTS_SCENEUTIL_CULLSAFEBOUNDSVISITOR_H
#define OPENMW_COMPONENTS_SCENEUTIL_CULLSAFEBOUNDSVISITOR_H
#include <vector>
#include <osg/BoundingBox>
#include <osg/Matrix>
#include <osg/NodeVisitor>
#include <osg/Drawable>
#include <osg/Transform>
namespace SceneUtil
{
// Computes bounding box of a node without dirtying it or any of its children
struct CullSafeBoundsVisitor : osg::NodeVisitor
{
CullSafeBoundsVisitor(osg::NodeVisitor::TraversalMode traversalMode = TRAVERSE_ALL_CHILDREN)
: osg::NodeVisitor(traversalMode)
{
}
void reset() override
{
mMatrixStack.clear();
mBoundingBox.init();
}
void apply(osg::Drawable& drawable)
{
osg::BoundingBox bbox = drawable.getInitialBound();
bbox.expandBy(drawable.computeBoundingBox());
applyBoundingBox(bbox);
}
void apply(osg::Transform& transform)
{
osg::Matrix matrix;
if (!mMatrixStack.empty())
matrix = mMatrixStack.back();
transform.computeLocalToWorldMatrix(matrix, this);
mMatrixStack.push_back(matrix);
traverse(transform);
mMatrixStack.pop_back();
}
void applyBoundingBox(const osg::BoundingBox& bbox)
{
if (mMatrixStack.empty())
{
mBoundingBox.expandBy(bbox);
}
else if (bbox.valid())
{
for (int i = 0; i < 8; ++i)
mBoundingBox.expandBy(bbox.corner(i) * mMatrixStack.back());
}
}
osg::BoundingBox mBoundingBox;
std::vector<osg::Matrix> mMatrixStack;
};
}
#endif // OPENMW_COMPONENTS_SCENEUTIL_CULLSAFEBOUNDSVISITOR_H
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