mat4 _temp = view_matrix*model_matrix;
eye_normal = mat3(_temp[0].xyz, _temp[1].xyz, _temp[2].xyz)*normal;
gl_Position = proj_matrix*view_matrix*model_matrix*position;
mat4 _temp = view_matrix*model_matrix;
eye_normal = mat3(_temp[0].xyz, _temp[1].xyz, _temp[2].xyz)*normal;
gl_Position = proj_matrix*view_matrix*model_matrix*position;