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
findOrthogonalVector(float inX,float inY,float inZ,float * outX,float * outY,float * outZ)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