Negative triangles and vertices count?

Troubleshooting graphics
1

So, I was playing with generative geometries and suff, however, to my surprise I got into a situation with negative triangles count!

How is that possible? I keep pressing my “generate geometry” button, the other counters increase but this one keeps falling down! I wathced and it fell below zero! And keeps falling each time I press the button. Then I notice that Vertices was falling too… and I pressed the button several more times:

What is happening? How this can be negative?

2

What version of the engine are you using? The github master (which is WIP and not meant for production)?

3

Nope, it’s the one available through the official maven. As far as I remember, that was the last stabile of 3.0. I am currently investigating the issue, since I don’t get my geometry displayed, and it bugs me. What is interesting - it worked OK like the day before yesterday… I did some changes to the code that I did not keep the exact track of, but I never thought it would bring to this… So now I am backtracing what I did that brought to this.

4

Haha! You would not believe that! I had an error in my code which discarded all the meshes that I generated and put the result of new Mesh() into the Geometry!

So, the code

Geometry g1 =  new Geometry("s", new Mesh());
g1.setMaterial(someMaterial);
getRootNode().attachChild(g1);

will cause your Triangles and Vertices counts to go down by -1! And in my original scene I had like 20+ objects and that’s why it was falling more rapidly. Crazy :smile:

5

Seems like a bug in our stats tracking, really.

6

I think the number of triangles of an empty mesh is defaulted to -1

7

Probably… but that’s incorrect since the number of triangles in an empty mesh is 0. :slight_smile:

8

Actually maybe user forgot to call updateCounts().
Anyway I added a bug in the system for this.

9

Well, that’s going to be true because in normal usage it’s automatic. Just apparently not in the empty mesh case.

10

And to be fair, I guess this isn’t an “empty” case as it’s a “no data” case… so it’s fine to throw an error.

Rendering the geometry should probably also throw an error in that case.