<html><head></head><body><div style="font-family:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:13px;"><div>gmsh 3.06 or 4.0.0</div><div>Dear Gmsh forum,</div><div><br></div><div>I have a geo file which I 3D mesh with tetrahedra, I can optimize the 3D mesh with Optimize 3D but if I use <span>Optimize 3D (Netgen) gmsh crashes with the following error:</span></div><div><span><br></span></div><div><span><span>Problem signature:<br> Problem Event Name: APPCRASH<br> Application Name: gmsh.exe<br> Application Version: 0.0.0.0<br> Application Timestamp: aa80aa78<br> Fault Module Name: gmsh.exe<br> Fault Module Version: 0.0.0.0<br> Fault Module Timestamp: aa80aa78<br> Exception Code: c0000005<br> Exception Offset: 00000000009545c0<br> OS Version: 6.1.7601.2.1.0.256.48<br> Locale ID: 2057<br> Additional Information 1: c684<br> Additional Information 2: c684f09528fb57884ca928a5bc428f55<br> Additional Information 3: cf6d<br> Additional Information 4: cf6d62335bc704516de51f24e907807e<br><br>Read our privacy statement online:<br> http://go.microsoft.com/fwlink/?linkid=104288&clcid=0x0409<br><br>If the online privacy statement is not available, please read our privacy statement offline:<br> C:\Windows\system32\en-US\erofflps.txt<br><br></span></span><div><br></div><div>Is this a known problem? My 2D mesh looks good but the quality of the 3D mesh is dubious & I was hoping the optimize 3D Netgen might improve the situation?</div><div>Regards</div><div>Mark<br></div><span></span><br></div></div></body></html>