Mesh Vertex Count Discrepancy

[kostas_grigoriadis@yahoo.co.uk]

Hello,

I have meshed 6 particle systems together into a ParticleMeshLegacy mesh and I get a vertex count of 124,717.
When I export the mesh as an .obj file and import into Rhino the vertex count is 124,556, which gives me a very big problem as I am using a vb Script to colour all vertices according to fluid weight values. Because the counts don't match the colours of the vertices are not accurate.

Any idea why the vertex count is not the same?
Any help/advice would be greatly appreciated.

[tsn]

Did you try to re-import the OBJ to RealFlow and check the vertex count there? It would be interesting to see if the difference is still existing.

Unfortunately I can't say why there is a difference at all, but I can say that the Legacy mesh is completely outdated and there won't be anymore development on this mesh type. It is - as the name says - only there for legacy reasons. I recommend using the "Particle Mesh" engine: it's faster (multi-threaded), more accurate, and you have better possibilities of adjusting the mesh's final look.

Maybe you can repeat the mesh export with the "Particle Mesh" engine. If there's still a difference please get back to us here in the forums.

Cheers,
Thomas

[kostas_grigoriadis@yahoo.co.uk]

Thank you for getting back. When I import the OBJ back into Realflow the vertex count is 124,717, which was the original count...
And I did just try to export in Rhino a Particle Mesh instead of a Particle Mesh Legacy and the vertex count seems to be fine now.

The only problem that I have now is that the Particle Mesh Legacy has the colours of the 6 particle systems mapped onto it, giving this result:

Screen Shot 2015-03-31 at 19.40.38.png

while the the Particle Mesh does not have the colours mapped:

Screen Shot 2015-03-31 at 19.40.13.png

Is there any way to have the colours on the Particle Mesh as well?

Thanks,
Kostas

[kostas_grigoriadis@yahoo.co.uk]

Also, I just tried with a larger vertex count (239,752) for a Particle Mesh in Realflow and when I import the OBJ in Rhino the count I get is 238,676.
It seems that the discrepancy occurs whenever the vertex count is high.

[tsn]

Thanks for testing that. I also checked an OBJ mesh file here with RF and Cinema 4D, but I couldn't see any differences. In RF vertex count is 626,959 and polygon count is 1,241,754 and it's exactly the same in C4D. Then I reimported the OBJ to RF and still had the same number of vertices and polygons.

But... at the first look I also thought that there's a difference (1,241,754 vs. 1,250,470), but I found the solution when I imported the OBJ back into RF while keeping the original mesh. Then I saw that my timeline slider was 1 frame ahead. This means that RF was showing the mesh at frame 126, but I have been loading mesh #125 to C4D. I simply went back to frame 125 and had exactly the same numbers of polygons and vertices. Maybe this happened to you as well? If not then it's very likely that Rhino does something weird with the OBJ files.

With regards colours I think you have to keep working with the legacy mesh. With the new engine, colours are packed into channels and they are extracted by the connectivity plugins. So, for Rhino the legacy mesh is your choice.