<HTML> <HEAD> <TITLE>distance</TITLE> <STYLE TYPE="text/css" MEDIA=screen> <!-- BODY { font-family: Arial,Helvetica; } BLOCKQUOTE { margin: 10pt; } H1,A { color: #336699; } /*** Top menu style ****/ .mmenuon { font-family: Arial,Helvetica; font-weight: bold; text-decoration: none; color: #ff6600; font-size: 10pt; } .mmenuoff { font-family: Arial,Helvetica; font-weight: bold; text-decoration: none; color: #ffffff; font-size: 10pt; } .cpyright { font-family: Arial,Helvetica; font-weight: bold; text-decoration: none; color: #ffffff; font-size: xx-small; } .cpyrightText { font-family: Arial,Helvetica; font-weight: bold; text-decoration: none; color: #ffffff; font-size: xx-small; } .sections { font-family: Arial,Helvetica; font-weight: bold; text-decoration: none; color: #336699; font-size: 11pt; } .dsections { font-family: Arial,Helvetica; font-weight: bold; text-decoration: none; color: #336699; font-size: 12pt; } .slink { font-family: Arial,Helvetica; font-weight: normal; text-decoration: none; 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float distance(float1 pt1, float1 pt2); float distance(float2 pt1, float2 pt2); float distance(float3 pt1, float3 pt2); float distance(float4 pt1, float4 pt2); half distance(half pt1, half pt2); half distance(half1 pt1, half1 pt2); half distance(half2 pt1, half2 pt2); half distance(half3 pt1, half3 pt2); half distance(half4 pt1, half4 pt2); fixed distance(fixed pt1, fixed pt2); fixed distance(fixed1 pt1, fixed1 pt2); fixed distance(fixed2 pt1, fixed2 pt2); fixed distance(fixed3 pt1, fixed3 pt2); fixed distance(fixed4 pt1, fixed4 pt2); </PRE> <H1><A NAME="PARAMETERS"><A NAME="3">PARAMETERS </A></A></H1> <DL> <DT><STRONG>pt1 </STRONG></DT> <DD> <P> First point. </P> <DT><STRONG>pt2 </STRONG></DT> <DD> <P> Second point. </P> </DD></DL> <H1><A NAME="DESCRIPTION"><A NAME="4">DESCRIPTION </A></A></H1> <P> Returns the Euclidean distance from a first point <I>pt1</I> to a second point <I>pt2</I>. </P> <H1><A NAME="REFERENCE_IMPLEMENTATION"><A NAME="5">REFERENCE IMPLEMENTATION </A></A></H1> <P> <B>distance</B> for a <B>float3</B> vector could be implemented like this. </P> <PRE> float distance(float3 pt1, float3 pt2) { float3 v = vt2 - pt1; return sqrt(dot(v,v)); } </PRE> <H1><A NAME="PROFILE_SUPPORT"><A NAME="6">PROFILE SUPPORT </A></A></H1> <P> <B>distance</B> is supported in all profiles except <A HREF="fp20.html">fp20</A>. </P> <H1><A NAME="SEE_ALSO"><A NAME="7">SEE ALSO </A></A></H1> <P> <A HREF="dot.html"><I>dot</I></A>, <A HREF="length.html"><I>length</I></A>, <A HREF="normalize.html"><I>normalize</I></A>, <A HREF="sqrt.html"><I>sqrt</I></A> </P> </BLOCKQUOTE> </BODY>