| // Copyright 2017 The Chromium Authors |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include "chrome/browser/vr/pose_util.h" |
| |
| #include "ui/gfx/geometry/transform.h" |
| |
| namespace vr { |
| |
| // Provides the direction the head is looking towards as a 3x1 unit vector. |
| gfx::Vector3dF GetForwardVector(const gfx::Transform& head_pose) { |
| // Same as multiplying the inverse of the rotation component of the matrix by |
| // (0, 0, -1, 0). |
| return gfx::Vector3dF(-head_pose.rc(2, 0), -head_pose.rc(2, 1), |
| -head_pose.rc(2, 2)); |
| } |
| |
| } // namespace vr |
