_initPlane() {
        // init transformation values
        this._initTransformValues();

        // init its position values
        this._initPositions();
        // set camera values
        this.setPerspective(this.camera.fov, this.camera.near, this.camera.far);
        // load sources
        this._initSources();
    }
Init our basic plane values (transformations, positions, camera, sources)
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