Weird Graphics for Mesh Created By Loading Data

Graphics
1

Hi, I am currently attempting to load some data at runtime, and use this data to create a mesh. At the moment, all vertices are placed correctly giving the correct shape. The problem I am having comes down to the normals.

1076×1238 286 KB

Above are three different scenarios.

When I do not assign any normals to the mesh, I get the result in the top left.

When assigning normals from the data I have loaded, I get the result in the top right. I have also visualised the vertices and normals.

When using RecalculateNormals(), I end up with the result at the bottom.

Firstly, I do not know where the bronze effect is coming from when using my own normals.

Secondly, I do not know why, even after using RecalculateNormals(), the normals are the same, yet produce a different graphical result, with the bronze now covering the entire object.

If anyone has any insight into what may be causing this the help would be appreciated.

2

As creating meshes from scratch is working fine as far as i experienced… i can only guess:

  • the third image actually looks exactly as it should - recalculate normals did its job fine.
  • where i see the problem is that your normals drawing code may be wrong (the green lines)
  • not only because it looks like a problem with the ray direction, but simply as image 2 and 3 clearly differ, but your green lines stay the same (and i sometimes ran into the same problem of trying to figure out normal problems, while my debug.draw code was to blame for the confusion)
3

Probably the data isn’t correct, and doesn’t have vertices split on hard edges; shared normals will not work if you want them to look right.

–Eric