IntersectSphere failure

[cignoni]

I have this minimal cpp example where calling of the IntersectSphere on a specific point for a rather simple mesh (bunny10k.obj) it causes a crash. It happens when compiled on macos 15.16.1 with clang++ 17.0.
Not sure of the reason (in the debugger the stack seems garbled)

minimal % ./build/simple_example bunny10k.obj
midpoint test (-4.473825,10.806343,-1.921793)
zsh: abort      ./build/simple_example bunny10k.obj

minimal.cpp
CMakeLists.txt
bunny10k.obj.zip

It happens very rarely (like 1/1000 ~ 1/10000 calls) but sometime happens.

[cignoni]

After further investigation it seems that for some reason once the BVH is build there are some nodes that share some of the sons. More precisely it happens that, for the given bunny10k model, if I add these two lines of code

printf("Sons of node %i %i %i\n",1987,bvh.bvhNode[1987].leftFirst,bvh.bvhNode[1987].leftFirst+1); printf("Sons of node %i %i %i\n",1359,bvh.bvhNode[1359].leftFirst,bvh.bvhNode[1359].leftFirst+1);

I get as result:

Sons of node 1987 1745 1746
Sons of node 1359 1744 1745

Any hints?