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From Tim Moore, "Double precision versions of BoundingBox and BoundingSphere are useful for doing computations in world coordinates, especially when working with a geocentric scene. By default, these classes are built using floats, so templated versions fill a need. I've used the double precision templates to fix some problems with ViewDependentShadow, which will follow shortly.

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"
This commit is contained in:
Robert Osfield
2008-11-26 16:39:52 +00:00
parent 98c197edad
commit d952172559
5 changed files with 254 additions and 310 deletions
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88
include/osg/BoundingBox
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@@ -22,24 +22,19 @@
namespace osg {
class BoundingSphere;
template<typename VT>
class BoundingSphereImpl;
/** General purpose axis-aligned bounding box class for enclosing objects/vertices.
* Bounds leaf objects in a scene such as osg::Drawable objects. Used for frustum
* culling etc.
*/
class OSG_EXPORT BoundingBox
template<typename VT>
class BoundingBoxImpl
{
public:
#ifdef OSG_USE_FLOAT_BOUNDINGBOX
typedef Vec3f vec_type;
typedef float value_type;
#else
typedef Vec3d vec_type;
typedef double value_type;
#endif
typedef VT vec_type;
typedef typename VT::value_type value_type;
/** Minimum extent. (Smallest X, Y, and Z values of all coordinates.) */
vec_type _min;
@@ -47,25 +42,35 @@ class OSG_EXPORT BoundingBox
vec_type _max;
/** Creates an uninitialized bounding box. */
inline BoundingBox() : _min(FLT_MAX,FLT_MAX,FLT_MAX),
_max(-FLT_MAX,-FLT_MAX,-FLT_MAX) {}
inline BoundingBoxImpl() :
_min(FLT_MAX,
FLT_MAX,
FLT_MAX),
_max(-FLT_MAX,
-FLT_MAX,
-FLT_MAX)
{}
/** Creates a bounding box initialized to the given extents. */
inline BoundingBox(value_type xmin, value_type ymin, value_type zmin,
inline BoundingBoxImpl(value_type xmin, value_type ymin, value_type zmin,
value_type xmax, value_type ymax, value_type zmax) :
_min(xmin,ymin,zmin),
_max(xmax,ymax,zmax) {}
/** Creates a bounding box initialized to the given extents. */
inline BoundingBox(const vec_type& min,const vec_type& max) :
inline BoundingBoxImpl(const vec_type& min,const vec_type& max) :
_min(min),
_max(max) {}
/** Clear the bounding box. Erases existing minimum and maximum extents. */
inline void init()
{
_min.set(FLT_MAX,FLT_MAX,FLT_MAX);
_max.set(-FLT_MAX,-FLT_MAX,-FLT_MAX);
_min.set(FLT_MAX,
FLT_MAX,
FLT_MAX);
_max.set(-FLT_MAX,
-FLT_MAX,
-FLT_MAX);
}
/** Returns true if the bounding box extents are valid, false otherwise. */
@@ -168,22 +173,22 @@ class OSG_EXPORT BoundingBox
/** Expands this bounding box to include the given bounding box.
* If this box is uninitialized, set it equal to bb. */
void expandBy(const BoundingBox& bb);
void expandBy(const BoundingBoxImpl& bb);
/** Expands this bounding box to include the given sphere.
* If this box is uninitialized, set it to include sh. */
void expandBy(const BoundingSphere& sh);
void expandBy(const BoundingSphereImpl<VT>& sh);
/** Returns the intersection of this bounding box and the specified bounding box. */
BoundingBox intersect(const BoundingBox& bb) const
{ return osg::BoundingBox(osg::maximum(xMin(),bb.xMin()),osg::maximum(yMin(),bb.yMin()),osg::maximum(zMin(),bb.zMin()),
BoundingBoxImpl intersect(const BoundingBoxImpl& bb) const
{ return BoundingBoxImpl(osg::maximum(xMin(),bb.xMin()),osg::maximum(yMin(),bb.yMin()),osg::maximum(zMin(),bb.zMin()),
osg::minimum(xMax(),bb.xMax()),osg::minimum(yMax(),bb.yMax()),osg::minimum(zMax(),bb.zMax()));
}
/** Return true if this bounding box intersects the specified bounding box. */
bool intersects(const BoundingBox& bb) const
bool intersects(const BoundingBoxImpl& bb) const
{ return osg::maximum(xMin(),bb.xMin()) <= osg::minimum(xMax(),bb.xMax()) &&
osg::maximum(yMin(),bb.yMin()) <= osg::minimum(yMax(),bb.yMax()) &&
osg::maximum(zMin(),bb.zMin()) <= osg::minimum(zMax(),bb.zMax());
@@ -200,6 +205,45 @@ class OSG_EXPORT BoundingBox
}
};
template<typename VT>
void BoundingBoxImpl<VT>::expandBy(const BoundingBoxImpl<VT>& bb)
{
if (!bb.valid()) return;
if(bb._min.x()<_min.x()) _min.x() = bb._min.x();
if(bb._max.x()>_max.x()) _max.x() = bb._max.x();
if(bb._min.y()<_min.y()) _min.y() = bb._min.y();
if(bb._max.y()>_max.y()) _max.y() = bb._max.y();
if(bb._min.z()<_min.z()) _min.z() = bb._min.z();
if(bb._max.z()>_max.z()) _max.z() = bb._max.z();
}
template<typename VT>
void BoundingBoxImpl<VT>::expandBy(const BoundingSphereImpl<VT>& sh)
{
if (!sh.valid()) return;
if(sh._center.x()-sh._radius<_min.x()) _min.x() = sh._center.x()-sh._radius;
if(sh._center.x()+sh._radius>_max.x()) _max.x() = sh._center.x()+sh._radius;
if(sh._center.y()-sh._radius<_min.y()) _min.y() = sh._center.y()-sh._radius;
if(sh._center.y()+sh._radius>_max.y()) _max.y() = sh._center.y()+sh._radius;
if(sh._center.z()-sh._radius<_min.z()) _min.z() = sh._center.z()-sh._radius;
if(sh._center.z()+sh._radius>_max.z()) _max.z() = sh._center.z()+sh._radius;
}
typedef BoundingBoxImpl<Vec3f> BoundingBoxf;
typedef BoundingBoxImpl<Vec3d> BoundingBoxd;
#ifdef OSG_USE_FLOAT_BOUNDINGBOX
typedef BoundingBoxf BoundingBox;
#else
typedef BoundingBoxd BoundingBox;
#endif
}
#endif