Relax smallest triangle area in TriangleMesh to 1e-36

[weiliangjin2021]

It's relaxed to the minimal positive normal 32-float number

[weiliangjin2021]

One question @caseyflex : do we really need to worry about zero area at all? If the area is too small, it can be just left out.

[weiliangjin2021]

One question @caseyflex : do we really need to worry about zero area at all? If the area is too small, it can be just left out.

I probably find the answer myself: if the entire surface is very small so that almost every triangle is ignored, it'll be severely off.

[caseyflex]

One question @caseyflex : do we really need to worry about zero area at all? If the area is too small, it can be just left out.

I probably find the answer myself: if the entire surface is very small so that almost every triangle is ignored, it'll be severely off.

I see, I had wondered about this earlier too, but yeah that case could definitely occur.