Panda3D
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00001 // Filename: linearRandomForce.I 00002 // Created by: charles (19Jun00) 00003 // 00004 //////////////////////////////////////////////////////////////////// 00005 // 00006 // PANDA 3D SOFTWARE 00007 // Copyright (c) Carnegie Mellon University. All rights reserved. 00008 // 00009 // All use of this software is subject to the terms of the revised BSD 00010 // license. You should have received a copy of this license along 00011 // with this source code in a file named "LICENSE." 00012 // 00013 //////////////////////////////////////////////////////////////////// 00014 00015 //////////////////////////////////////////////////////////////////// 00016 // Function : random_unit_vector 00017 // Access : Protected 00018 // Description : generates a random unit vector 00019 //////////////////////////////////////////////////////////////////// 00020 INLINE LVector3 LinearRandomForce:: 00021 random_unit_vector() { 00022 PN_stdfloat z, r, theta; 00023 00024 z = 1.0 - (2.0 * bounded_rand()); 00025 r = csqrt(1.0 - (z * z)); 00026 theta = 2.0 * MathNumbers::pi * bounded_rand(); 00027 00028 return LVector3(r * ccos(theta), r * csin(theta), z); 00029 } 00030