Can someone check if this is working in maxima 5.19? load(draw); eq:x^2+y^2+z^2=1; draw3d(enhanced3d=true, implicit(eq,x,-1,1,y,-1,1,z,-1,1)) I get the plot but no colors at all. It is working in version 5.18.1. Thank you, Jer?nimo. ------------------------------------- Jer?nimo Alaminos