Lionel, I need your help Tweet

[steveps3]

This is probably just for Lionel but maybe someone else can help also.

I am working on an image and in Blender it looks good. When I export to Octane I am getting some weird lines appearing in the render. It is as if the exported (1,17) is generating extra mesh from somewhere.

Lionel, if you want I can sent you the .blend if it will help.

[matej]

Maybe here is the solution (didnt read the thread)

[ROUBAL]

It looks like some vertices were not affected by the fluid simulation (maybe a vertex group) and are linked to the simulation by edges...

[steveps3]

The fluid sim has been applied and there are no index groups. It is just a mesh. I will have to investigate some more.

[steveps3]

I guess that the exporter doesn't like extreme meshes. Maybe I can break it up or something.

[steveps3]

Ok, I think I may be on to something. It would appear as if the fluid sim leaves holes in the mesh for some odd reason. My theory is that because the mesh is so complex that the exporter script just gets a bit confused by these holes and decides to make them into a face linked to the origin point. I've started plugging these holes and all seems to be going well.

[steveps3]

Ok, I have found the REAL reason. The fluid sim seems to create stray edges. These are edges which do no form a face. If I manage to locate and delete these edges then the problem goes away. Unfortunately finding them is a nightmare. Blender has no tool for finding stray edges.

[steveps3]

Ok I have worked out a solution. Export the mesh as a .obj and then reimport it. This will make the ugly spikes very obvious. They can then be easily removed. Bingo, no more spikes.

[matej]

Blender has no tool for finding stray edges.

It does (i think it's a recent adddition): Select menu -> loose verts/edges

[steveps3]

The verts aren't loose. It is just that the face that that form only has 2 verts and therefore has zero area.

In fact if you look at this years GSOC there is a plan to introduce a tool that does eliminate zero area faces. Hopefully this will make it into Blender pretty quickly.