<li>From the Modification menu or from the contextual menu in the
Object Browser choose <b> Convert to/from Quadratic Mesh</b> item,
or click <em>"Convert to/from quadratic"</em> button in the
<li>From the Modification menu or from the contextual menu in the
Object Browser choose <b> Convert to/from Quadratic Mesh</b> item,
or click <em>"Convert to/from quadratic"</em> button in the