Hello Sirs!
I hope you are safe and well Sirs!.
Can you please see the opening?
if I dynamesh it, it will fill up the opening which I do not want
I have masked out the area that I do not want after the dynamesh.
is there a way to dynamesh the object while it does not fill up the opening?
it should follow the outer shape curve.
Thanks much much
Hello @One_Above_All ,
Dynamesh uses the Close Holes functionality. Close Holes does just that–it draws a surface in the most efficient manner possible between points A, B and C. It does not evaluate the form of the mesh.
This mesh is fundamentally unsuitable for Dynamesh. It is an open surface. Dynamesh requires a closed volume with a minimal degree of thickness to work. It will attempt to close minor gaps on the surface of the mesh, but will not create thickness for you. Further, if a section of the mesh is read an an open volume or if it is overly thin or 2D in an area, it will begin to break apart in a Dynamesh process, creating problematic geometry.
My suggestion in this case would be rather than just pulling a section of 2D geometry off your mesh, instead use Live Boolean to use another subtractive mesh to cut the rest away in a manner that results in a closed solid. It should then be able to be Dynameshed much more easily and produce far cleaner results.
Likewise, you could attempt to use ZRemesher first to clean and simplify the geometry. There doesn’t appear to be much surface detail to lose here so simply ZRemeshing at high target polycount should produce acceptable results. This will hopefully create a cleaner mesh with fewer polygons that would be within reach of the Dynamic Subdivision “Thickness” feature, which well let you create thickness for a 2D surface. Once thickened, it should be suitable for Dynamesh.
Further information:
http://docs.pixologic.com/user-guide/3d-modeling/modeling-basics/creating-meshes/dynamesh/
http://docs.pixologic.com/user-guide/3d-modeling/modeling-basics/creating-meshes/live-boolean/
http://docs.pixologic.com/user-guide/3d-modeling/topology/zremesher/
Good luck! 
Thank you Spyndel,
I will try it out.
Thank you once again Spyndel
It is much appriciated
Another option, if you must Dynamesh a thin surface, is to give it a small thickness first. For low poly meshes Zmodeller is the way but for higher poly counts (like your example seems to be) use Dynamic Subdivision.
Activate Dynamic Subdivision, deactivate smoothing (SMT), set the number of subdivisions to 0 (leaves the existing mesh untouched), increase the Thickness a little (maybe 0.01 +/-), and Apply to convert to a thin walled solid. Outside, inside and edge polys will have unique polygroups which will be approximately preserved when the thickened object is Dynameshes.
This method can be taxing on your system if the original mesh is millions of polys (so make sure to set subdivs to 0 and deactivate smooth) but if it’s only a once off to get started with a Dynamesh, then it can be a reasonable option.
