1 /* 2 * Copyright (C) 2016 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #include <algos/vec.h> 18 #include <nanohub_math.h> 19 20 21 void findOrthogonalVector( float inX, float inY, float inZ, float *outX, float *outY, float *outZ) { 22 23 float x, y, z; 24 25 // discard the one with the smallest absolute value 26 if (fabsf(inX) <= fabsf(inY) && fabsf(inX) <= fabsf(inZ)) { 27 x = 0.0f; 28 y = inZ; 29 z = -inY; 30 } else if (fabsf(inY) <= fabsf(inZ)) { 31 x = inZ; 32 y = 0.0f; 33 z = -inX; 34 } else { 35 x = inY; 36 y = -inX; 37 z = 0.0f; 38 } 39 40 float magSquared = x * x + y * y + z * z; 41 float invMag = 1.0f / sqrtf(magSquared); 42 43 *outX = x * invMag; 44 *outY = y * invMag; 45 *outZ = z * invMag; 46 } 47
