sequence gives different result than individual terms in sequence
I'm trying to show horizontal traces and contours of 2D surfaces. The horizontal traces work fine but the contours are not working well.
sequence(f=c,cmin,cmax,dc)produces no results for some functions (-xye^(-x^2-y^2) for instance).
Sequence(Translate(IntersectPath(z = c, a), Vector((0, 0, -c))), c, cmin, cmax, dc)and related things zipping the list of horizontal traces with the list of plane heights that created the traces all produce curves entirely unrelated to the horizontal traces (and blatantly incorrect contours for the function). The only thing that works is tying translation of the intersection curves to a slider and then tracing that.
Warning, because I tried to show various methods all in one file, the file is enormously taxing to the CPU and nearly as slow as pouring molasses outside in the arctic winter.
Tried both GeoGebra 5.0.620.0 and GeoGebra 6.0.620 on MacBook Air running MacOS 10.14.6.