Hmm.. yes, interface problems.
The green graph: material use changes due to support. I am only calculating the volume of support, subtracting out the volume of the base model. The left is a heatmap of orientation from -180->180 on X and Y. The right one is a histogram of all the values that we got from our samples (we sampled every 20 degrees in X and Y for rotations).
The purple graph is the surface area of the model that contacts support material. This changes based on orientation, too.
The blue is a histogram of all the angles of support material in the current orientation. You can click around the heatmaps to change the orientation of the model; in my experience, the angle at which the support hits the model can make it harder or easier to remove, so I measured that, too.
Sadly the only interactive thing is the heatmaps on the far left. They rotate the model around.
Darker colors = worse, and lighter colors = better on the heatmaps. So longer print times are darker, more material use is darker, etc.