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https://github.com/SoftFever/OrcaSlicer.git
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2ae2672ee9
Fixing dep build script on Windows and removing some warnings. Use bundled igl by default. Not building with the dependency scripts if not explicitly stated. This way, it will stay in Fix the libigl patch to include C source files in header only mode.
74 lines
2 KiB
C++
74 lines
2 KiB
C++
// This file is part of libigl, a simple c++ geometry processing library.
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//
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// Copyright (C) 2014 Alec Jacobson <alecjacobson@gmail.com>
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//
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// This Source Code Form is subject to the terms of the Mozilla Public License
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// v. 2.0. If a copy of the MPL was not distributed with this file, You can
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// obtain one at http://mozilla.org/MPL/2.0/.
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#include "ray_sphere_intersect.h"
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template <
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typename Derivedo,
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typename Derivedd,
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typename Derivedc,
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typename r_type,
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typename t_type>
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IGL_INLINE int igl::ray_sphere_intersect(
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const Eigen::PlainObjectBase<Derivedo> & ao,
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const Eigen::PlainObjectBase<Derivedd> & d,
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const Eigen::PlainObjectBase<Derivedc> & ac,
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r_type r,
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t_type & t0,
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t_type & t1)
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{
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Eigen::Vector3d o = ao-ac;
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// http://wiki.cgsociety.org/index.php/Ray_Sphere_Intersection
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//Compute A, B and C coefficients
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double a = d.dot(d);
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double b = 2 * d.dot(o);
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double c = o.dot(o) - (r * r);
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//Find discriminant
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double disc = b * b - 4 * a * c;
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// if discriminant is negative there are no real roots, so return
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// false as ray misses sphere
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if (disc < 0)
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{
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return 0;
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}
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// compute q as described above
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double distSqrt = sqrt(disc);
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double q;
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if (b < 0)
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{
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q = (-b - distSqrt)/2.0;
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} else
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{
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q = (-b + distSqrt)/2.0;
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}
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// compute t0 and t1
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t0 = q / a;
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double _t1 = c/q;
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if(_t1 == t0)
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{
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return 1;
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}
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t1 = _t1;
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// make sure t0 is smaller than t1
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if (t0 > t1)
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{
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// if t0 is bigger than t1 swap them around
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double temp = t0;
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t0 = t1;
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t1 = temp;
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}
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return 2;
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}
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#ifdef IGL_STATIC_LIBRARY
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// Explicit template instantiation
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template int igl::ray_sphere_intersect<Eigen::Matrix<double, 3, 1, 0, 3, 1>, Eigen::Matrix<double, 3, 1, 0, 3, 1>, Eigen::Matrix<double, 3, 1, 0, 3, 1>, double, double>(Eigen::PlainObjectBase<Eigen::Matrix<double, 3, 1, 0, 3, 1> > const&, Eigen::PlainObjectBase<Eigen::Matrix<double, 3, 1, 0, 3, 1> > const&, Eigen::PlainObjectBase<Eigen::Matrix<double, 3, 1, 0, 3, 1> > const&, double, double&, double&);
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#endif
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