25 lines
830 B
C++
25 lines
830 B
C++
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// Copyright 2024 Bytedance Inc. All Rights Reserved.
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// Author: tianlei.richard@qq.com (tianlei.richard)
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#include "camera.h"
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Camera::Camera(const Vector3d &up)
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: position_(Point3d::Identity()), gaze_(Vector3d::Identity()), up_(up) {}
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TransformMatrix Camera::get_view_transform() const {
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// Move camera to origin
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TransformMatrix m{{1, 0, 0, -position_.x()},
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{0, 1, 0, -position_.y()},
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{0, 0, 1, -position_.z()},
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{0, 0, 0, 1}};
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// Adjust to fit xyz
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const Vector3d &x_camera{(gaze_.cross(up_)).normalized()};
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m = TransformMatrix{{x_camera.x(), x_camera.y(), x_camera.z(), 0},
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{up_.x(), up_.y(), up_.z(), 0},
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{-gaze_.x(), -gaze_.y(), -gaze_.z(), 0},
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{0, 0, 0, 1}} *
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m;
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return m;
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}
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