const glm::vec3 &outline_color = { -1, -1, -1 })
: id(-1), visible(v), shape(shape), color(color), outline_color(outline_color) { }
const glm::vec3 &outline_color = { -1, -1, -1 })
: id(-1), visible(v), shape(shape), color(color), outline_color(outline_color) { }