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Add refract node #1698

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merged 5 commits into from
Feb 7, 2024
Merged

Add refract node #1698

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09efabe
add refract node
ld-kerley Feb 5, 2024
72f25fb
fix typo 'reflected' -> 'refracted'
ld-kerley Feb 6, 2024
a696e0a
Minor updates to documentation
jstone-lucasfilm Feb 7, 2024
545985f
Minor updates to documentation
jstone-lucasfilm Feb 7, 2024
93d6805
rename 'eta' to 'ior' to align better with the rest of the node defin…
ld-kerley Feb 7, 2024
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12 changes: 12 additions & 0 deletions libraries/stdlib/stdlib_defs.mtlx
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Original file line number Diff line number Diff line change
Expand Up @@ -2761,6 +2761,18 @@
<output name="out" type="vector3" />
</nodedef>

<!--
Node: <refract>
Compute the refraction direction of an input vector against a normal vector.
The normal vector is assumed to be normalized.
-->
<nodedef name="ND_refract_vector3" node="refract" nodegroup="math" doc="Compute the refraction direction of an input vector.">
<input name="in" type="vector3" value="1.0,0.0,0.0" doc="Input vector to be reflected." />
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<input name="normal" type="vector3" defaultgeomprop="Nworld" doc="Normal vector." />
<input name="eta" type="float" value="1.0" doc="Ratio of the indices of refraction."/>
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<output name="out" type="vector3" />
</nodedef>

<!-- ======================================================================== -->
<!-- Adjustment nodes -->
<!-- ======================================================================== -->
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62 changes: 62 additions & 0 deletions libraries/stdlib/stdlib_ng.mtlx
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Expand Up @@ -2728,6 +2728,68 @@
<output name="out" type="vector3" nodename="reflection_vector" />
</nodegraph>

<!--
Node: <refract>
Compute the refraction direction of an input vector against a normal vector.
The normal vector is assumed to be normalized.
-->
<nodegraph name="NG_refract_vector3" nodedef="ND_refract_vector3">
<dotproduct name="IdotN" type="float">
<input name="in1" type="vector3" interfacename="in"/>
<input name="in2" type="vector3" interfacename="normal"/>
</dotproduct>
<multiply name="IdotNsq" type="float">
<input name="in1" type="float" nodename="IdotN"/>
<input name="in2" type="float" nodename="IdotN"/>
</multiply>
<multiply name="etasq" type="float">
<input name="in1" type="float" interfacename="eta"/>
<input name="in2" type="float" interfacename="eta"/>
</multiply>
<subtract name="one_IdotNsq" type="float">
<input name="in1" type="float" value="1.0"/>
<input name="in2" type="float" nodename="IdotNsq"/>
</subtract>
<multiply name="etasq_one_IdotNsq" type="float">
<input name="in1" type="float" nodename="etasq"/>
<input name="in2" type="float" nodename="one_IdotNsq"/>
</multiply>
<subtract name="k" type="float">
<input name="in1" type="float" value="1.0"/>
<input name="in2" type="float" nodename="etasq_one_IdotNsq"/>
</subtract>
<multiply name="I_scaled" type="vector3">
<input name="in1" type="vector3" interfacename="in"/>
<input name="in2" type="float" interfacename="eta"/>
</multiply>
<sqrt name="sqrt_k" type="float">
<input name="in" type="float" nodename="k"/>
</sqrt>
<multiply name="eta_NdotI" type="float">
<input name="in1" type="float" interfacename="eta"/>
<input name="in2" type="float" nodename="IdotN"/>
</multiply>
<add name="eta_NdotI_sqrt_k" type="float">
<input name="in1" type="float" nodename="eta_NdotI"/>
<input name="in2" type="float" nodename="sqrt_k"/>
</add>
<multiply name="N_scaled" type="vector3">
<input name="in1" type="vector3" interfacename="normal"/>
<input name="in2" type="float" nodename="eta_NdotI_sqrt_k"/>
</multiply>
<subtract name="refract_dir" type="vector3">
<input name="in1" type="vector3" nodename="I_scaled"/>
<input name="in2" type="vector3" nodename="N_scaled"/>
</subtract>
<ifgreater name="result" type="vector3">
<input name="value1" type="float" value="0.0"/>
<input name="value2" type="float" nodename="k"/>
<input name="in1" type="vector3" value="0.0, 0.0, 0.0"/>
<input name="in2" type="vector3" nodename="refract_dir"/>
</ifgreater>
<output name="out" type="vector3" nodename="result"/>
</nodegraph>

<!-- ======================================================================== -->
<!-- Adjustment nodes -->
<!-- ======================================================================== -->
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