axmol/extensions/Particle3D/PU/PUPlane.cpp

/****************************************************************************
 Copyright (C) 2013 Henry van Merode. All rights reserved.
 Copyright (c) 2015-2016 Chukong Technologies Inc.
 Copyright (c) 2017-2018 Xiamen Yaji Software Co., Ltd.
 Copyright (c) 2019-present Axmol Engine contributors (see AUTHORS.md).

 https://axmolengine.github.io/

 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
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 all copies or substantial portions of the Software.

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#include "PUPlane.h"

NS_AX_BEGIN
//-----------------------------------------------------------------------
PUPlane::PUPlane()
{
    // Vec3 default constructor zero
    // normal = Vec3::ZERO;
    d = 0.0;
}
//-----------------------------------------------------------------------
PUPlane::PUPlane(const PUPlane& rhs) : normal(rhs.normal), d(rhs.d) {}
//-----------------------------------------------------------------------
PUPlane::PUPlane(const Vec3& rkNormal, float fConstant) : normal(rkNormal), d(-fConstant) {}
//---------------------------------------------------------------------
PUPlane::PUPlane(float a, float b, float c, float _d) : normal(a, b, c), d(_d) {}
//-----------------------------------------------------------------------
PUPlane::PUPlane(const Vec3& rkNormal, const Vec3& rkPoint)
{
    redefine(rkNormal, rkPoint);
}
//-----------------------------------------------------------------------
PUPlane::PUPlane(const Vec3& rkPoint0, const Vec3& rkPoint1, const Vec3& rkPoint2)
{
    redefine(rkPoint0, rkPoint1, rkPoint2);
}
//-----------------------------------------------------------------------
float PUPlane::getDistance(const Vec3& rkPoint) const
{
    return normal.dot(rkPoint) + d;
}
//-----------------------------------------------------------------------
// Plane::Side Plane::getSide (const Vec3& rkPoint) const
//{
//	float fDistance = getDistance(rkPoint);
//
//	if ( fDistance < 0.0 )
//		return Plane::NEGATIVE_SIDE;
//
//	if ( fDistance > 0.0 )
//		return Plane::POSITIVE_SIDE;
//
//	return Plane::NO_SIDE;
//}
//
//
////-----------------------------------------------------------------------
// Plane::Side Plane::getSide (const AABB& box) const
//{
//	if (box.isEmpty())
//		return NO_SIDE;
//	if (box.isInfinite())
//		return BOTH_SIDE;
//
//	return getSide(box.getCenter(), box);
// }
////-----------------------------------------------------------------------
// Plane::Side Plane::getSide (const Vec3& centre, const Vec3& halfSize) const
//{
//	// Calculate the distance between box centre and the plane
//	float dist = getDistance(centre);
//
//	// Calculate the maximise allows absolute distance for
//	// the distance between box centre and plane
//	float maxAbsDist = normal.absDotProduct(halfSize);
//
//	if (dist < -maxAbsDist)
//		return Plane::NEGATIVE_SIDE;
//
//	if (dist > +maxAbsDist)
//		return Plane::POSITIVE_SIDE;
//
//	return Plane::BOTH_SIDE;
// }
//-----------------------------------------------------------------------
void PUPlane::redefine(const Vec3& rkPoint0, const Vec3& rkPoint1, const Vec3& rkPoint2)
{
    Vec3 kEdge1 = rkPoint1 - rkPoint0;
    Vec3 kEdge2 = rkPoint2 - rkPoint0;
    Vec3::cross(kEdge1, kEdge2, &normal);
    normal.normalize();
    d = -normal.dot(rkPoint0);
}
//-----------------------------------------------------------------------
void PUPlane::redefine(const Vec3& rkNormal, const Vec3& rkPoint)
{
    normal = rkNormal;
    d      = -rkNormal.dot(rkPoint);
}
//-----------------------------------------------------------------------
Vec3 PUPlane::projectVector(const Vec3& p) const
{
    // We know plane normal is unit length, so use simple method
    // Matrix3 xform;
    // xform[0][0] = 1.0f - normal.x * normal.x;
    // xform[0][1] = -normal.x * normal.y;
    // xform[0][2] = -normal.x * normal.z;
    // xform[1][0] = -normal.y * normal.x;
    // xform[1][1] = 1.0f - normal.y * normal.y;
    // xform[1][2] = -normal.y * normal.z;
    // xform[2][0] = -normal.z * normal.x;
    // xform[2][1] = -normal.z * normal.y;
    // xform[2][2] = 1.0f - normal.z * normal.z;

    Mat4 xform;
    xform.m[0]  = 1.0f - normal.x * normal.x;
    xform.m[1]  = -normal.x * normal.y;
    xform.m[2]  = -normal.x * normal.z;
    xform.m[4]  = -normal.y * normal.x;
    xform.m[5]  = 1.0f - normal.y * normal.y;
    xform.m[6]  = -normal.y * normal.z;
    xform.m[8]  = -normal.z * normal.x;
    xform.m[9]  = -normal.z * normal.y;
    xform.m[10] = 1.0f - normal.z * normal.z;
    return xform * p;
}
//-----------------------------------------------------------------------
float PUPlane::normalize()
{
    float fLength = normal.length();

    // Will also work for zero-sized vectors, but will change nothing
    // We're not using epsilons because we don't need to.
    // Read http://www.ogre3d.org/forums/viewtopic.php?f=4&t=61259
    if (fLength > float(0.0f))
    {
        float fInvLength = 1.0f / fLength;
        normal *= fInvLength;
        d *= fInvLength;
    }

    return fLength;
}
NS_AX_END