Hi, I have a question regarding face normal perturbation.
I have a dense OBJ file which I’m trying to convert to either “rtm” or “rad” using obj2mesh/obj2rad, but no matter what I do the surface normals come out unperturbed (nx=Nx).
To look into the problem more closely I looked at just a single polygon, and even though it has vertex normals which are not identical, the texfunc section is not generated in obj2rad. Admittedly the difference between these normals is not big, but I’d still like to see them interpolated. Also, meshlab loads and renders this polygon without any issues.
Could this be a precision issue?
Here’s the OBJ file definition:
v 0 9.7041597 3.7353301
v 0.0648700 9.7040806 3.7353201
v 0.0648700 9.7593098 3.7337399
Yes, I see this limit is applied bothin obj2rad and obj2mesh. It amounts to a little less than 1/5 of a degree, which although small, could concievably be visible if not corrected in a set of facets. You can certainly alter this value, and if you see a difference with and without normals, I may go ahead and follow your suggestion for upcoming releases. Why don’t you try setting COSTOL to 0.99999996, which is about one arc-minute? I think that should be safely below the visibility tolerance in most circumstances.