ofxARCore

Experimental addon for openFrameworks to use ARCore on Android devices.

About

This addon is based on the work of HalfdanJ. This is not an official Google product.

Developer guide

To use the addon, you need the development branch of openFrameworks from github. Follow the Android Studio guide to learn how to get started with openFrameworks and Android.

To add the addon, add ofxARCore to addons.make in your project, or through the project generator. Additionally you will need to add the following two lines to the end of settings.gradle of your project:

What is implemented

Anchor

ofxARCore arcore;
vector<ofMatrix4x4> anchors;

void ofApp::setup() {
  arcore.setup();
}

void ofApp::update() {
  anchors.push_back(arcore.getViewMatrix().getInverse());
}

void RafalleApp::draw() {

    for (int i = 0; i < anchors.size(); i++) {

        ofMatrix4x4 anchor = anchors[i];
        ofPushMatrix();
        ofMultMatrix(anchor);

        ofDrawBox(ofVec3f(0,0,0), 0.05); // Draws a 5cm box at anchor location

        ofPopMatrix();
    }


    ofDisableDepthTest();

}

Point Cloud

vector<float> point_cloud;
ofVbo vbo_pointcloud;

void ofApp::setup() {
    for(int i = 0; i < point_cloud.size(); i++) {
        point_color.push_back(ofColor::red);
    }
    vbo_pointcloud.setVertexData(&point_cloud[0], 3, 1000, GL_DYNAMIC_DRAW);
    vbo_pointcloud.setColorData(&point_color[0], 1000, GL_DYNAMIC_DRAW);
    point_color.clear();
}

void ofApp::update() {
    point_cloud = arcore->getPointCloud();
    if (point_cloud.size() > 1) {
        for (int i = 0; i < point_cloud.size(); i++)
            point_color.push_back(ofColor::red);

        vbo_pointcloud.updateVertexData(&point_cloud[0], (int) point_cloud.size() * 2);
        vbo_pointcloud.updateColorData(&point_color[0], (int) point_color.size() * 2);
    }

    for (int i = 0; i < point_cloud.size(); i+=3) {
        ofVec3f pos(point_cloud[i], point_cloud[i+1], point_cloud[i+2]);
        points.push_back(pos);
    }
}

for (int i = 0; i < points.size(); i+=3) {
    ofDrawBox(points[i], 0.01); // Draws a 1cm box at each point of point cloud
}

Augmented Images

void AugmentedImage::draw() {

    vector<ofAugmentedImage*> augmented_images = arcore->getImageMatrices();

    // draw a box above each detected image
    for (int i = 0; i < augmented_images.size(); i++) {

        if (augmented_images[i]->is_tracking == true) {

            // get AugmentedImage position
            ofMatrix4x4 anchor = augmented_images[i]->matrix;
            ofPushMatrix();
            // translate to AugmentedImage position
            ofMultMatrix(anchor);

            ofBoxPrimitive box;

            // set box dimentions according to arcore image width estimation
            box.set(augmented_images[i]->width, 0.01, augmented_images[i]->height);
            box.setPosition(0,-depth/2,0);

            // draw box above the image
            box.draw();


            ofPopMatrix();
        }
    }

}

Utils

#### Camera FOV
arcore.getCameraFOV();

Screen DPI

arcore.getDpi();