A solid with equilateral triangular cross-sections.
(u,v)=var("u v")
front=parametric_plot3d([u,u^2-1-v*(u^2-1),sqrt(3)*v*(1-u^2)],(u,-1,1),(v,0,1),opacity=0.5)
back=parametric_plot3d([u,-(u^2-1-v*(u^2-1)),sqrt(3)*v*(1-u^2)],(u,-1,1),(v,0,1),opacity=0.5)
triangle1=parametric_plot3d([0.5,u*(1-0.5^2)*(1-v),v*sqrt(3)*(1-0.5^2)],(u,-1,1),(v,0,1),color='red')
triangle2=parametric_plot3d([-0.2,u*(1-0.2^2)*(1-v),v*sqrt(3)*(1-0.2^2)],(u,-1,1),(v,0,1),color='red')
bottom=parametric_plot3d([u,v*(u^2-1),0],(u,-1,1),(v,-1,1),opacity=0.5)
front+back+bottom+triangle1+triangle2
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Sleeping...
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