You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
42 lines
1.3 KiB
42 lines
1.3 KiB
// David Eberly, Geometric Tools, Redmond WA 98052
|
|
// Copyright (c) 1998-2021
|
|
// Distributed under the Boost Software License, Version 1.0.
|
|
// https://www.boost.org/LICENSE_1_0.txt
|
|
// https://www.geometrictools.com/License/Boost/LICENSE_1_0.txt
|
|
// Version: 4.0.2019.08.13
|
|
|
|
#pragma once
|
|
|
|
#include <Mathematics/TIQuery.h>
|
|
#include <Mathematics/Halfspace.h>
|
|
#include <Mathematics/Hypersphere.h>
|
|
|
|
// Queries for intersection of objects with halfspaces. These are useful for
|
|
// containment testing, object culling, and clipping.
|
|
|
|
namespace gte
|
|
{
|
|
template <typename Real>
|
|
class TIQuery<Real, Halfspace3<Real>, Sphere3<Real>>
|
|
{
|
|
public:
|
|
struct Result
|
|
{
|
|
bool intersect;
|
|
};
|
|
|
|
Result operator()(Halfspace3<Real> const& halfspace, Sphere3<Real> const& sphere)
|
|
{
|
|
Result result;
|
|
|
|
// Project the sphere center onto the normal line. The plane of
|
|
// the halfspace occurs at the origin (zero) of the normal line.
|
|
Real center = Dot(halfspace.normal, sphere.center) - halfspace.constant;
|
|
|
|
// The sphere and halfspace intersect when the projection interval
|
|
// maximum is nonnegative.
|
|
result.intersect = (center + sphere.radius >= (Real)0);
|
|
return result;
|
|
}
|
|
};
|
|
}
|
|
|