 &gt; refract(vecType&lt; T, P &gt; const &amp;I, vecType&lt; T, P &gt; const &amp;N, T const &amp;eta)</div><div class="ttdoc">For the incident vector I and surface normal N, and the ratio of indices of refraction eta...</div></div>
<div class="ttc" id="a00155_html_gaea946f96ec1df259802effe9f532e1c1"><div class="ttname"><a href="a00155.html#gaea946f96ec1df259802effe9f532e1c1">glm::abs</a></div><div class="ttdeci">GLM_FUNC_DECL genType abs(genType const &amp;x)</div><div class="ttdoc">Returns x if x &amp;gt