// perspective (default) camera
camera {
    location  <4, 2, 1>
    look_at   0
}

// create a regular point light source
light_source {<0, 5, 0> 0.5}
light_source {<4, 2, 1> 0.5}

background { color rgb 1 }

#declare T_Red = texture {
    pigment { color rgb <1,0,0>}
    finish { 
        diffuse 1.0
        ambient 0.0
        phong   0.5     
    }
}

isosurface {
    function {abs(x/sqrt(2))+abs(y)+abs(z/sqrt(2))-1}
    contained_by{box{sqrt(2),<-sqrt(2),0,-sqrt(2)>}}
    max_gradient 1.4
    rotate 45*y  
    texture { T_Red }
}