lvfulong
80 lines
2.2 KiB
C++
80 lines
2.2 KiB
C++
/**
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@file JCPlane.cpp
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@brief
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@author James
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@version 1.0
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@date 2016_10_31
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*/
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#include "JCPlane.h"
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#include "JCBoundingSphere.h"
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#include <math.h>
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namespace laya
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{
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JCPlane::JCPlane()
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{
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m_nDistance = 0;
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}
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JCPlane::JCPlane(const Vector3& normal, float nDistance)
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{
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m_kNormal = normal;
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m_nDistance = nDistance;
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}
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JCPlane::JCPlane(const Vector3& point1, const Vector3& point2, const Vector3& point3)
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{
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float x1 = point2.x - point1.x;
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float y1 = point2.y - point1.y;
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float z1 = point2.z - point1.z;
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float x2 = point3.x - point1.x;
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float y2 = point3.y - point1.y;
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float z2 = point3.z - point1.z;
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float yz = (y1 * z2) - (z1 * y2);
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float xz = (z1 * x2) - (x1 * z2);
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float xy = (x1 * y2) - (y1 * x2);
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float invPyth = 1 / (sqrtf((yz * yz) + (xz * xz) + (xy * xy)));
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float x = yz * invPyth;
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float y = xz * invPyth;
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float z = xy * invPyth;
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m_kNormal.x = x;
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m_kNormal.y = y;
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m_kNormal.z = z;
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m_nDistance = -((x * point1.x) + (y * point1.y) + (z * point1.z));
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}
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JCPlane::~JCPlane()
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{
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}
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void JCPlane::normalize()
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{
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float fMagnitude = 1 / sqrtf(m_kNormal.x * m_kNormal.x + m_kNormal.y * m_kNormal.y + m_kNormal.z * m_kNormal.z);
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m_kNormal.x *= fMagnitude;
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m_kNormal.y *= fMagnitude;
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m_kNormal.z *= fMagnitude;
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m_nDistance *= fMagnitude;
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}
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PLANE_INTERSECTION_TYPE JCPlane::intersectsPoint(const Vector3& point)
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{
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float distance = m_kNormal.dot(point) + m_nDistance;
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if (distance > 0)
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return PIT_FRONT;
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else if (distance < 0)
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return PIT_BACK;
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else
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return PIT_INTERSECTING;
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}
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PLANE_INTERSECTION_TYPE JCPlane::intersectsSphere( const JCBoundingSphere& sphere)
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{
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float sphereR = sphere.m_nRadius;
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float distance = m_kNormal.dot(sphere.m_kCenter) + m_nDistance;
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if (distance > sphereR)
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return PIT_FRONT;
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else if (distance < -sphereR)
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return PIT_BACK;
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else
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return PIT_INTERSECTING;
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}
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}
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//-----------------------------END FILE--------------------------------
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