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      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