overte-HifiExperiments/interface/src/ui/overlays/Billboardable.cpp

//
//  Billboardable.cpp
//  interface/src/ui/overlays
//
//  Created by Zander Otavka on 8/7/15.
//  Modified by Daniela Fontes on 24/10/17.
//  Copyright 2014 High Fidelity, Inc.
//
//  Distributed under the Apache License, Version 2.0.
//  See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html
//

#include "Billboardable.h"

#include <Application.h>
#include <Transform.h>
#include "avatar/AvatarManager.h"

void Billboardable::setProperties(const QVariantMap& properties) {
    auto isFacingAvatar = properties["isFacingAvatar"];
    if (isFacingAvatar.isValid()) {
        setIsFacingAvatar(isFacingAvatar.toBool());
    }
}

// JSDoc for copying to @typedefs of overlay types that inherit Billboardable.
/**jsdoc
 * @property {boolean} isFacingAvatar - If <code>true</code>, the overlay is rotated to face the user's camera about an axis
 *     parallel to the user's avatar's "up" direction.
 */
QVariant Billboardable::getProperty(const QString &property) {
    if (property == "isFacingAvatar") {
        return isFacingAvatar();
    }
    return QVariant();
}

bool Billboardable::pointTransformAtCamera(Transform& transform, glm::quat offsetRotation) {
    if (isFacingAvatar()) {
        glm::vec3 billboardPos = transform.getTranslation();
        glm::vec3 cameraPos = qApp->getCamera().getPosition();
        // use the referencial from the avatar, y isn't always up
        glm::vec3 avatarUP = DependencyManager::get<AvatarManager>()->getMyAvatar()->getWorldOrientation()*Vectors::UP;
        
        glm::quat rotation(conjugate(toQuat(glm::lookAt(cameraPos, billboardPos, avatarUP))));
        
        transform.setRotation(rotation);
        transform.postRotate(offsetRotation);
        return true;
    }
    return false;
}