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<BLOCKQUOTE>
<H1><A NAME="NAME"><A NAME="1">NAME
</A></A></H1>
<P>
<B>tex3D</B> - performs a texture lookup in a given 3D sampler. May also use pre computed derivatives
if those are provided.
</P>
<H1><A NAME="SYNOPSIS"><A NAME="2">SYNOPSIS
</A></A></H1>
<PRE> float4 tex3D(sampler3D samp, float3 s)
float4 tex3D(sampler3D samp, float3 s, int texelOff)
float4 tex3D(sampler3D samp, float3 s, float3 dx, float3 dy)
float4 tex3D(sampler3D samp, float3 s, float3 dx, float3 dy, int texelOff)
int4 tex3D(isampler3D samp, float3 s)
int4 tex3D(isampler3D samp, float3 s, int texelOff)
int4 tex3D(isampler3D samp, float3 s, float3 dx, float3 dy)
int4 tex3D(isampler3D samp, float3 s, float3 dx, float3 dy, int texelOff)
unsigned int4 tex3D(usampler3D samp, float3 s)
unsigned int4 tex3D(usampler3D samp, float3 s, int texelOff)
unsigned int4 tex3D(usampler3D samp, float3 s, float3 dx, float3 dy)
unsigned int4 tex3D(usampler3D samp, float3 s, float3 dx, float3 dy,
int texelOff)
</PRE>
<H1><A NAME="PARAMETERS"><A NAME="3">PARAMETERS
</A></A></H1>
<DL>
<DT><STRONG>samp
</STRONG></DT>
<DD>
<P>
Sampler to lookup.
</P>
<DT><STRONG>s
</STRONG></DT>
<DD>
<P>
Coordinates to perform the lookup.
</P>
<DT><STRONG>dx
</STRONG></DT>
<DD>
<P>
Pre computed derivative along the x axis.
</P>
<DT><STRONG>dy
</STRONG></DT>
<DD>
<P>
Pre computed derivative along the y axis.
</P>
<DT><STRONG>texelOff
</STRONG></DT>
<DD>
<P>
Offset to be added to obtain the final texel.
</P>
</DD></DL>
<H1><A NAME="DESCRIPTION"><A NAME="4">DESCRIPTION
</A></A></H1>
<P>
Performs a texture lookup in sampler <I>samp</I> using coordinates <I>s</I>, may use and derivatives <I>dx</I>
and <I>dy</I>, also may use texel offset <I>texelOff</I> to compute final texel.
</P>
<H1><A NAME="PROFILE_SUPPORT"><A NAME="5">PROFILE SUPPORT
</A></A></H1>
<P>
<B>tex3D</B> is supported in all fragment profiles and all vertex profiles starting with <A HREF="vp40.html">vp40</A>,
variants with texel offsets are only supported in <A HREF="gp4.html">gp4</A> and newer profiles. Variants with
integer samplers are also only suppported in <A HREF="gp4.html">gp4</A> and newer profiles.
</P>
<H1><A NAME="SEE_ALSO"><A NAME="6">SEE ALSO
</A></A></H1>
<P>
<A HREF="tex3Dbias.html"><I>tex3Dbias</I></A>, <A HREF="tex3Dlod.html"><I>tex3Dlod</I></A>, <A HREF="tex3Dproj.html"><I>tex3Dproj</I></A>
</P>
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