00001 // Filename: linearRandomForce.I 00002 // Created by: charles (19Jun00) 00003 // 00004 //////////////////////////////////////////////////////////////////// 00005 // 00006 // PANDA 3D SOFTWARE 00007 // Copyright (c) 2001, Disney Enterprises, Inc. All rights reserved 00008 // 00009 // All use of this software is subject to the terms of the Panda 3d 00010 // Software license. You should have received a copy of this license 00011 // along with this source code; you will also find a current copy of 00012 // the license at http://www.panda3d.org/license.txt . 00013 // 00014 // To contact the maintainers of this program write to 00015 // panda3d@yahoogroups.com . 00016 // 00017 //////////////////////////////////////////////////////////////////// 00018 00019 //////////////////////////////////////////////////////////////////// 00020 // Function : random_unit_vector 00021 // Access : Protected 00022 // Description : generates a random unit vector 00023 //////////////////////////////////////////////////////////////////// 00024 INLINE LVector3f LinearRandomForce:: 00025 random_unit_vector(void) { 00026 float z, r, theta; 00027 00028 z = 1.0f - (2.0f * bounded_rand()); 00029 r = sqrtf(1.0f - (z * z)); 00030 theta = 2.0f * 3.1415926f * bounded_rand(); 00031 00032 return LVector3f(r * cosf(theta), r * sinf(theta), z); 00033 } 00034
1.3