Variable section sweep

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Let's say you have a box with dimensions sd4 and sd5.

You need to create datum graphs that start at the heights of those two dimensions and you need to take them down to 0 along the x-axis.

Then you write a relation tying the part to the graph. It would look something like this:

sd4=evalgraph("<graphname>",200*trajpar)

where trajpar is you origin trajectory and 200 is the length of your graph.

The graph should be drawn in the 1st quadrant and there can be no more than 1 y-value per x-value.