Add distance math node (AcademySoftwareFoundation#1333)

Adding distance math node to measure the distance between two points.

Author: Cinifreak

libraries/stdlib/stdlib_defs.mtlx

@@ -2201,6 +2201,26 @@
     <output name="out" type="float" default="0.0" />
   </nodedef>
 
+  <!--
+    Node: <distance>
+    Measures the distance between two points in 2D, 3D, or 4D.
+  -->
+  <nodedef name="ND_distance_vector2" node="distance" nodegroup="math">
+    <input name="in1" type="vector2" uiname="in1" value="0.0, 0.0" />
+    <input name="in2" type="vector2" uiname="in2" value="0.0, 0.0" />
+    <output name="out" type="float" />
+  </nodedef>
+  <nodedef name="ND_distance_vector3" node="distance" nodegroup="math">
+    <input name="in1" type="vector3" uiname="in1" value="0.0, 0.0, 0.0" />
+    <input name="in2" type="vector3" uiname="in2" value="0.0, 0.0, 0.0" />
+    <output name="out" type="float" />
+  </nodedef>
+  <nodedef name="ND_distance_vector4" node="distance" nodegroup="math">
+    <input name="in1" type="vector4" uiname="in1" value="0.0, 0.0, 0.0, 0.0" />
+    <input name="in2" type="vector4" uiname="in2" value="0.0, 0.0, 0.0, 0.0" />
+    <output name="out" type="float" />
+  </nodedef>
+  
   <!--
     Node: <dotproduct>
     Perform a dot product of two 2-4 channel vectors

libraries/stdlib/stdlib_ng.mtlx

@@ -1291,6 +1291,41 @@
     <output name="out" type="vector2" nodename="N_switch_operationorder" />
   </nodegraph>
 
+  <!--
+    Node: <distance>
+    Measures the distance between two points in 2D, 3D, or 4D.
+  -->
+  <nodegraph name="NG_distance_vector2" nodedef="ND_distance_vector2">
+    <subtract name="N_mtlxsubtract" type="vector2">
+      <input name="in1" type="vector2" interfacename="in1" />
+      <input name="in2" type="vector2" interfacename="in2" />
+    </subtract>
+    <magnitude name="N_mtlxmagnitude" type="float">
+      <input name="in" type="vector2" nodename="N_mtlxsubtract" />
+    </magnitude>
+    <output name="out" type="float" nodename="N_mtlxmagnitude" />
+  </nodegraph>
+  <nodegraph name="NG_distance_vector3" nodedef="ND_distance_vector3">
+    <subtract name="N_mtlxsubtract" type="vector3">
+      <input name="in1" type="vector3" interfacename="in1" />
+      <input name="in2" type="vector3" interfacename="in2" />
+    </subtract>
+    <magnitude name="N_mtlxmagnitude" type="float">
+      <input name="in" type="vector3" nodename="N_mtlxsubtract" />
+    </magnitude>
+    <output name="out" type="float" nodename="N_mtlxmagnitude" />
+  </nodegraph>
+  <nodegraph name="NG_distance_vector4" nodedef="ND_distance_vector4">
+    <subtract name="N_mtlxsubtract" type="vector4">
+      <input name="in1" type="vector4" interfacename="in1" />
+      <input name="in2" type="vector4" interfacename="in2" />
+    </subtract>
+    <magnitude name="N_mtlxmagnitude" type="float">
+      <input name="in" type="vector4" nodename="N_mtlxsubtract" />
+    </magnitude>
+    <output name="out" type="float" nodename="N_mtlxmagnitude" />
+  </nodegraph>
+  
   <!-- ======================================================================== -->
   <!-- Adjustment nodes                                                         -->
   <!-- ======================================================================== -->