Method get_previous

js/src/scatter.ts:356–358

(name, index, default_value)

        return this._get_value(this.model.get(name), index, default_value);
    }
    get_previous(name, index, default_value) {
        return this._get_value(this.previous_values[name] || this.model.get(name), index, default_value);
    }
    _get_value_vec3(value, index, default_value) {
        if (!value) {
            return default_value;