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-/****************************************************************************
-**
-** Copyright (C) 2017 The Qt Company Ltd.
-** Contact: https://www.qt.io/licensing/
-**
-** This file is part of Qt 3D Studio.
-**
-** $QT_BEGIN_LICENSE:BSD$
-** Commercial License Usage
-** Licensees holding valid commercial Qt licenses may use this file in
-** accordance with the commercial license agreement provided with the
-** Software or, alternatively, in accordance with the terms contained in
-** a written agreement between you and The Qt Company. For licensing terms
-** and conditions see https://www.qt.io/terms-conditions. For further
-** information use the contact form at https://www.qt.io/contact-us.
-**
-** BSD License Usage
-** Alternatively, you may use this file under the terms of the BSD license
-** as follows:
-**
-** "Redistribution and use in source and binary forms, with or without
-** modification, are permitted provided that the following conditions are
-** met:
-** * Redistributions of source code must retain the above copyright
-** notice, this list of conditions and the following disclaimer.
-** * Redistributions in binary form must reproduce the above copyright
-** notice, this list of conditions and the following disclaimer in
-** the documentation and/or other materials provided with the
-** distribution.
-** * Neither the name of The Qt Company Ltd nor the names of its
-** contributors may be used to endorse or promote products derived
-** from this software without specific prior written permission.
-**
-**
-** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
-**
-** $QT_END_LICENSE$
-**
-****************************************************************************/
-
-/*[[
- <Property name="cameraTarget" formalName="Camera Target" type="ObjectRef" default="Scene.Layer.Camera" description="Object in scene the camera should look at" />
- <Property name="startImmediately" formalName="Start Immediately?" type="Boolean" default="True" publishLevel="Advanced" description="Start immediately, or wait for\nthe Enable action to be called?" />
-
- <Handler name="start" formalName="Start" category="CameraLookAt" description="Begin looking the target" />
- <Handler name="stop" formalName="Stop" category="CameraLookAt" description="Stop looking the target" />
-]]*/
-
-import QtStudio3D.Behavior 1.0
-
-Behavior {
- //External:
- property string cameraTarget
- property bool startImmediately
- //Internal:
- property bool running: false
- property var updateFunction
-
- function start() {
- running = true;
- }
-
- function stop() {
- running = false;
- }
-
- onInitialize: {
- if (startImmediately)
- start();
- }
-
- onUpdate: {
- if (!running)
- return;
- var targetTransform = calculateGlobalTransform(cameraTarget);
- var targetSpot = targetTransform.row(3).toVector3d();
- var cameraTransform = calculateGlobalTransform();
- var cameraSpot = cameraTransform.row(3).toVector3d();
-
- var matrix = calculateGlobalTransform("parent").inverted();
- matrix.m41 = 0;
- matrix.m42 = 0;
- matrix.m43 = 0;
-
- var rotateRay = targetSpot
- .minus(cameraSpot)
- .times(matrix);
-
- var rotation = lookAt(rotateRay);
- setAttributeVector("rotation", rotation);
- }
-
- function getAttributeVector(name) {
- var vec = Qt.vector3d(0, 0, 0);
- getAttribute(name + ".x", vec.x);
- getAttribute(name + ".y", vec.y);
- getAttribute(name + ".z", vec.z);
- return vec;
- }
-
- function setAttributeVector(name, vec) {
- setAttribute(name + ".x", vec.x);
- setAttribute(name + ".y", vec.y);
- setAttribute(name + ".z", vec.z);
- }
-}