Does Mesh Eval fail to preview points?

[giu]

Hi,

Points of Mesh Closest Point seem to be different from ones of Mesh Eval on this canvas, but their coordinates are the same(Mesh Closest Point works precisely). Is this a problem of the rhino viewer?
In this case, are normal vectors of Mesh Eval precise outputs?

unnamed.gh (59.7 KB)

[HS_Kim]

Triangulate your mesh should work.

unnamed _re.gh (67.0 KB)

[giu]

Hi, @HS_Kim

Thanks for your fast reply. Your Grasshopper let me understand Mesh Eval works not on quad meshes but triangle meshes, but I think this system doesn’t match UX…

[Dani_Abalde]

It looks like a bug @stevebaer (I didn’t know who to address this to).
The method expect a fourth barycentric coordinate, so it should work for quad meshes.
https://developer.rhino3d.com/api/RhinoCommon/html/M_Rhino_Geometry_Mesh_PointAt_1.htm

[Dani_Abalde]

You can make it work for quad meshes resetting the face order.

[giu]

Are meshes of twisted faces generated in this way? This is not what I expected.

[Dani_Abalde]

Just use that mesh to evaluate the points, use the original for the rest. Or use a triangular mesh.