BoundingSphere.inl

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/*
   Copyright (c) 2018 DIVIDE-Studio
   Copyright (c) 2009 Ionut Cava
 
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#ifndef DVD_CORE_MATH_BOUNDINGVOLUMES_BOUNDINGSPHERE_INL_
#define DVD_CORE_MATH_BOUNDINGVOLUMES_BOUNDINGSPHERE_INL_
 
namespace Divide {
 
inline void BoundingSphere::fromBoundingBox(const BoundingBox& bBox) noexcept {
    _center.set(bBox.getCenter());
    _radius = (bBox.getMax() - _center).length();
}
 
inline void BoundingSphere::fromBoundingSphere(const BoundingSphere& bSphere) noexcept {
    _center.set(bSphere.getCenter());
    _radius = bSphere.getRadius();
}
 
// https://code.google.com/p/qe3e/source/browse/trunk/src/BoundingSphere.h?r=28
inline void BoundingSphere::add(const BoundingSphere& bSphere) noexcept {
    const F32 dist = (bSphere._center - _center).length();
 
    if (_radius >= dist + bSphere._radius) {
        return;
    }
 
    if (bSphere._radius >= dist + _radius) {
        _center = bSphere._center;
        _radius = bSphere._radius;
    }
 
    if (dist > EPSILON_F32) {
        const F32 nRadius = (_radius + dist + bSphere._radius) * 0.5f;
        const F32 ratio = (nRadius - _radius) / dist;
        _center += (bSphere._center - _center) * ratio;
 
        _radius = nRadius;
    }
}
 
inline void BoundingSphere::addRadius(const BoundingSphere& bSphere) noexcept {
    const F32 dist = (bSphere._center - _center).length() + bSphere._radius;
    if (_radius < dist) {
        _radius = dist;
    }
}
 
inline void BoundingSphere::add(const vec3<F32>& point) noexcept {
    const vec3<F32> diff(point - _center);
    const F32 dist = diff.length();
    if (_radius < dist) {
        const F32 nRadius = (dist - _radius) * 0.5f;
        _center += diff * (nRadius / dist);
        _radius += nRadius;
    }
}
 
inline void BoundingSphere::addRadius(const vec3<F32>& point) noexcept {
    const F32 dist = (point - _center).length();
    if (_radius < dist) {
        _radius = dist;
    }
}
 
inline void BoundingSphere::createFromPoints(const vector<vec3<F32>>& points) noexcept {
    _radius = 0;
    const F32 numPoints = to_F32(points.size());
 
    for (const vec3<F32>& p : points) {
        _center += p / numPoints;
    }
 
    for (const vec3<F32>& p : points) {
        const F32 distance = (p - _center).length();
 
        if (distance > _radius) {
            _radius = distance;
        }
    }
}
 
inline void BoundingSphere::createFromPoints(const std::array<vec3<F32>, 8>& points) noexcept {
    _radius = 0;
 
    for (const vec3<F32>& p : points) {
        _center += p / 8;
    }
 
    for (const vec3<F32>& p : points) {
        const F32 distance = (p - _center).length();
 
        if (distance > _radius) {
            _radius = distance;
        }
    }
}
 
inline void BoundingSphere::reset() noexcept {
    _center.reset();
    _radius = 0.0f;
}
 
inline void BoundingSphere::setRadius(const F32 radius) noexcept {
    _radius = radius;
}
 
inline void BoundingSphere::setCenter(const vec3<F32>& center) noexcept {
    _center = center;
}
 
inline const vec3<F32>& BoundingSphere::getCenter() const noexcept { return _center; }
 
inline F32 BoundingSphere::getRadius() const noexcept { return _radius; }
 
inline F32 BoundingSphere::getDiameter() const noexcept { return _radius * 2; }
 
inline F32 BoundingSphere::getDistanceFromPoint(const vec3<F32>& point) const noexcept
{
    return getCenter().distance(point) - getRadius();
}
inline F32 BoundingSphere::getDistanceSQFromPoint(const vec3<F32>& point) const noexcept
{
    // If this is negative, than the sphere contains the point, so we clamp min distance
    return std::max(getCenter().distanceSquared(point) - SQUARED(getRadius()), 0.f);
}
inline vec4<F32> BoundingSphere::asVec4() const noexcept
{
    return vec4<F32>(getCenter(), getRadius());
}
}  // namespace Divide
 
#endif  //DVD_CORE_MATH_BOUNDINGVOLUMES_BOUNDINGSPHERE_INL_