if (init == 0)
{
    if (issolid)
    {
        if (!i_ex(mysolid))
            mysolid = instance_create(x, y, obj_solidblock);
    }
    init = 1;
}
if (issolid)
{
    mysolid.x = x;
    mysolid.y = y;
    mysolid.sprite_index = sprite_index;
    mysolid.mask_index = mask_index;
    mysolid.image_xscale = image_xscale;
    mysolid.image_yscale = image_yscale;
    mysolid.image_angle = image_angle;
}
if (markerstick)
    setxy(x - markerxoffset, y - markeryoffset, marker);