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## Main Question or Discussion Point

I am computing a stereographic projection in R^4 and i think i am correct in setting

x=rcos(x)sin(y)

y=rsin(x)sin(y)

z=rcos(y)

but can't see how to compute r as I do not know to visualise it graphically as was possible in R^3, any help would be greatly appreciated

x=rcos(x)sin(y)

y=rsin(x)sin(y)

z=rcos(y)

but can't see how to compute r as I do not know to visualise it graphically as was possible in R^3, any help would be greatly appreciated