Fix typo in Distance3D shader generation

doc/source/changelog.md

@@ -28,6 +28,7 @@ Primarily developped with Godot 4.3.
     - `VoxelGeneratorGraph`: 
         - Fixed wrong values when using `OutputWeight` with optimized execution map enabled, when weights are determined to be locally constant
         - Fixed occasional holes in terrain when using `FastNoise3D` nodes with the `OpenSimplex2S` noise type
+        - Fixed shader generation error when using the `Distance3D` node (vec2 instead of vec3, thanks to scwich)
     - `VoxelMesherTransvoxel`: revert texturing logic that attempted to prevent air voxels from contributing, but was lowering quality. It is now optional as an experimental property.
     - `VoxelStreamSQLite`: Fixed "empty size" errors when loading areas with edited `VoxelInstancer` data
     - `.vox` scene importer: disabled threaded import to workaround the editor freezing when saving meshes

generators/graph/nodes/math_vectors.h

@@ -87,7 +87,7 @@ void register_math_vector_nodes(Span<NodeType> types) {
 		};
 		t.shader_gen_func = [](ShaderGenContext &ctx) {
 			ctx.add_format(
-					"{} = distance(vec3({}, {}, {}), vec2({}, {}, {}));\n",
+					"{} = distance(vec3({}, {}, {}), vec3({}, {}, {}));\n",
 					ctx.get_output_name(0),
 					ctx.get_input_name(0),
 					ctx.get_input_name(1),