BOPAlgo_MakerVolume produces undetectable solids

[allenbarnett5]

Hi: Here is a short draw.sh script which splits a solid cylinder into three parts with faces normal to the cylinder axis. After the mkvolume command (BOPAlgo_MakerVolume), I explode the result into its constituent solids and display them. In the viewer, however, only the bottom-most shape (r_3) is highlighted (i.e., detected) when you move the mouse over it. The other two solids (r_1 and r_2) don't appear to be detected. If you erase r_3, then r_2 is detected only when the mouse is over the bottom disk, not the cylindrical side or top disk. r_3 isn't detected at all.

I looked at the dump of the geometries of the cut cylinders and I didn't really see anything which looked incorrect; the normals all point the right way and the wires seem to be correct. The "bounding" command returns the correct values for the solids.

I tried this with a box and a sphere in place of the cylinder and it worked ok; all the exploded solids were detectable.

Can someone suggest where in the code to look to diagnose this issue?

Tested with Version 7.9.2, Ubuntu gcc 11.4.

Thanks,
Allen

# BOPAlgo_MakerVolume produces undetectable solids
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pcylinder c 1 15
plane p1 0 0 5 0 0 1
plane p2 0 0 10 0 0 1
mkface fp1 p1 -2 2 -2 2
mkface fp2 p2 -2 2 -2 2
mkvolume r c fp1 fp2
explode r so
vinit -width 500 -height 500
vdisplay r_1 r_2 r_3
vfit