[SOLVED] Vertices increase on import

Hi, I'm trying to understand the following:

For example I have a 3d model that has 142 vertices in my 3d modeling package. Once I import this model into Unity this same model has suddenly 10 or 20 times the amount of vertices. I know this has something to do with the color, UV's, Smoothing etc.
How would I correctly reduce the amount of vertices for those models? How can I make sure that if I import that specific model the vertices won't be 10 times the amount of vertices. My model only uses a simple texture without any bump maps or anything special. What is the workflow for this? I'm trying to understand why the vertices gets 10x increased?

Anyone got a good explanation for this? And why is this happening exactly? Is there maybe a tutorial or something for this on how to handle this?

As you can see here in Unity my simple character has lots of vertices: See screenhot: http://prntscr.com/l8lgkj
But in my modeling program only 142: See screenhot: http://prntscr.com/l8li0c

Regards

 

@karl_jones Thanks for the reply. After removing the skybox, which resulted in the scene to only have 3 vertices, I added the model to the scene and now it gives me 1.3k vertices. See screenshot: http://prntscr.com/l8w4ho
This is still an increase 10 fold of the vertex amount that the modeling package showed me. Is this correct? Is there maybe a resource where this is explained?

So let's say if i build a mobile game and the max amount of vertices for a mobile model is recommended to be around 25,000 vertices, so when modeling inside the 3d package i must calculate the total vertices 10x to come up with the correct vertex amount in Unity? So once I have a model of 2500 vertices inside the modeling package this will result in a model with 25,000 vertices in Unity?

 

1.Unity will triangulate the model.
2.Unity does add new vertices to make hard corners in the mesh.

But this should not result in a 10x increase in vertices.

 

Then I'm wondering what causes this? It's just a simple FBX export from Max to Unity. The model only has a simple material aplied to it. I'm not sure why this happens. Anyone else?

 

If you have more than one material:
increase vertex count by material count

If you have a UVMap:
Increase vertex count by magnitude of 1 x number of materials with a UV map

if you have multiple textures on your UV map
Increase vertex count by magnitude of 1 x number of materials x number of materials

if you are not using smooth shading
Increase vertex count by magnitude of 1

There are dozens of other multipliers as well. Basically, nothing is free.

 

@karl_jones As you can see here the vertices are 1272 in Unity and in Max it is 344 (I had ignore backfacing on ;-) : http://prntscr.com/l9czn0. So that reduces 10 fold to 3 fold the amount of vertices. It's better already ;-)

@Ne0mega Thanks for the explanation. I use 1 simple diffuse texture, 1 UV map and hard corners for the model. So does this explain the increase from 344 to 1272 vertices for that specific model?

And is there maybe a workflow explained somewhere with the above in mind how to be spare with model export etc so the model will be optimized for export?

 

@karl_jones Thanks for bringing that topic up. As suggested in the topic I tried the "Turn to Poly" modifier in max but my polygons are already maximum optimized so the result is the same for triangles.
I think the increase of vertices has to do with the hard edged the model has. It doesn't have a smoothing group. So for the hard edges Unity adds additional vertices necessary to render the edges. That's also the conclusion in that specific topic.

 

@karl_jones I agree, it doesn’t need all the quads. The reason is that the model is exported from voxel editor Qubicle to Max to Unity. I now optimized the mesh in Max and brought down vertices to 124 in Max. But again, from Max to Unity the model increases to 534 vertices. I can no other conclude it has to do with the hard edges. It’s ok for now till maybe someone comes up with another explanation ;-). Thanks so far.

 

@karl_jones Thanks for the reply. I disabled normals and tangents on the model, but the vertices stay the same. Still an increase of 400%. 124 in Max and 534 in Unity.

 

Hi @karl_jones I have send you the FBX file through a private conversation.

 

@karl_jones Thanks for helping me out. Learned some more ;-)

 

I think it is important to note that a light source, such as the directional light displayed in the default scene for example, will also add verts if set to generate shadows

 

What I usually do is to use framedebugger to see what the source of problem is, sometimes it is lights, sometimes it is additional unwanted shader, another time I found out it is transparency even, this link is a great.