Ykkrosh
147d4f2bd3
CBound operator+= updated the minimum value or the maximum value, but never both. (I think the operator+=(CVector3D) has always been buggy (because it assumes min<max, which isn't true of empty bounds), and I propagated the error to operator+=(CBound) ages ago.) Added test cases, and fixed. This was SVN commit r4244.
79 lines
2.2 KiB
C++
79 lines
2.2 KiB
C++
///////////////////////////////////////////////////////////////////////////////
|
|
//
|
|
// Name: Bound.h
|
|
// Author: Rich Cross
|
|
// Contact: rich@wildfiregames.com
|
|
//
|
|
///////////////////////////////////////////////////////////////////////////////
|
|
|
|
#ifndef _BOUND_H
|
|
#define _BOUND_H
|
|
|
|
// necessary includes
|
|
#include "Vector3D.h"
|
|
#include "Matrix3D.h"
|
|
|
|
class CFrustum;
|
|
|
|
///////////////////////////////////////////////////////////////////////////////
|
|
// CBound: basic axis aligned bounding box class
|
|
class CBound
|
|
{
|
|
public:
|
|
CBound() { SetEmpty(); }
|
|
CBound(const CVector3D& min,const CVector3D& max) {
|
|
m_Data[0]=min; m_Data[1]=max;
|
|
}
|
|
|
|
void Transform(const CMatrix3D& m,CBound& result) const;
|
|
|
|
CVector3D& operator[](int index) { return m_Data[index]; }
|
|
const CVector3D& operator[](int index) const { return m_Data[index]; }
|
|
|
|
void SetEmpty();
|
|
bool IsEmpty();
|
|
|
|
CBound& operator+=(const CBound& b);
|
|
CBound& operator+=(const CVector3D& pt);
|
|
|
|
bool RayIntersect(const CVector3D& origin,const CVector3D& dir,float& tmin,float& tmax) const;
|
|
|
|
// return the volume of this bounding box
|
|
float GetVolume() const {
|
|
CVector3D v=m_Data[1]-m_Data[0];
|
|
return v.X*v.Y*v.Z;
|
|
}
|
|
|
|
// return the centre of this bounding box
|
|
void GetCentre(CVector3D& centre) const {
|
|
centre=(m_Data[0]+m_Data[1])*0.5f;
|
|
}
|
|
|
|
/**
|
|
* IntersectFrustumConservative: Approximate the intersection of this bounds object
|
|
* with the given frustum. The bounds object is overwritten with the results.
|
|
*
|
|
* The approximation is conservative in the sense that the result will always contain
|
|
* the actual intersection, but it may be larger than the intersection itself.
|
|
* The result will always be fully contained within the original bounds.
|
|
*
|
|
* @note While not in the spirit of this function's purpose, a no-op would be a correct
|
|
* implementation of this function.
|
|
*
|
|
* @param frustum the frustum to intersect with
|
|
*/
|
|
void IntersectFrustumConservative(const CFrustum& frustum);
|
|
|
|
/**
|
|
* Render: Render the surfaces of the bound object as polygons.
|
|
*/
|
|
void Render();
|
|
|
|
private:
|
|
CVector3D m_Data[2];
|
|
};
|
|
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////
|
|
|
|
|
|
#endif
|