`addNormals` warnings
stla opened this issue · 1 comments
stla commented
Hello,
I have this mesh (you can read it with Rvcg::vcgPlyRead
).
When I do addNormals(mesh)
, I have some warnings:
1: In acos(dot/veclen(a)/veclen(b)) : NaNs produced
2: In acos(dot/veclen(a)/veclen(b)) : NaNs produced
......
I find it's strange because I don't see what is bad in this mesh.
When I do addNormals(mesh, angleWeighted = FALSE)
, there's no warning.
There's also an angle weighted method in the Rvcg package (Rvcg::vcgUpdateNormals(mesh, type=1)
), it works without errors/warnings.
dmurdoch commented
I think that's caused by rounding error. In the first case, the dot/veclen(a)/veclen(b)
value comes out to 1 + 2e-16
, and acos
gives NaN
as the answer. I'll force the values to the range -1 to 1.
Thanks for the report.