node tolerance

The very first thing to know: when you set node tolerance = 0.1mm for example, you can not create element with size < 0.1mm /emoticons/default_smile.png' srcset='/emoticons/smile@2x.png 2x' title=':)' width='20'>

In general I work with node tolerance about 1/10 or 1/20 of my smallest element size.

Yes i jnow the element size must be larger than node tolerance. But what exactly is the node tolernace and what are the consequences when it is to large/small?

The simple method to undestand is try yourself.

• If the tolerance is too large, you can not refine your mesh and 'equivalent' node will destroy completely your mesh.
• If the tolerance is too small, HM can not detect coincident nodes for 'equivalent' node operation
• etc...etc...