Add documentation for VoxelModifier classes

doc/classes/VoxelModifier.xml

@@ -1,13 +1,18 @@
 <?xml version="1.0" encoding="UTF-8" ?>
 <class name="VoxelModifier" inherits="Node3D" xmlns:xsi="http:https://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../../../doc/class.xsd">
  <brief_description>
+ Base class for voxel modifiers.
  </brief_description>
  <description>
+ Modifiers are meant to be as an extension to terrain's generator that non-destructively affect limited volume. Stacks with other modifiers. Runtime edits from [VoxelTool] override modifier values.
+ Note 1: Only works with [VoxelLodTerrain].
+ Note 2: Only works with smooth terrain (SDF).
  </description>
  <tutorials>
  </tutorials>
  <members>
  <member name="operation" type="int" setter="set_operation" getter="get_operation" enum="VoxelModifier.Operation" default="0">
+ An operation modifier performs on the terrain or to other modifiers.
  </member>
  <member name="smoothness" type="float" setter="set_smoothness" getter="get_smoothness" default="0.0">
  Increasing this value makes the shape "merge" with its surroundings across a more or less large distance. 
@@ -16,8 +21,10 @@
  </members>
  <constants>
  <constant name="OPERATION_ADD" value="0" enum="Operation">
+ Performs SDF union.
  </constant>
  <constant name="OPERATION_REMOVE" value="1" enum="Operation">
+ Performs SDF subtraction.
  </constant>
  </constants>
 </class>

doc/classes/VoxelModifierMesh.xml

@@ -1,15 +1,18 @@
 <?xml version="1.0" encoding="UTF-8" ?>
 <class name="VoxelModifierMesh" inherits="VoxelModifier" xmlns:xsi="http:https://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../../../doc/class.xsd">
  <brief_description>
+ Voxel modifier that uses [VoxelMeshSDF].
  </brief_description>
  <description>
  </description>
  <tutorials>
  </tutorials>
  <members>
  <member name="isolevel" type="float" setter="set_isolevel" getter="get_isolevel" default="0.0">
+ Offsets isolevel of SDF mesh. Increasing this value makes object appear thicker and vice versa.
  </member>
  <member name="mesh_sdf" type="VoxelMeshSDF" setter="set_mesh_sdf" getter="get_mesh_sdf">
+ SDF mesh that is used for modifier.
  </member>
  </members>
 </class>

doc/classes/VoxelModifierSphere.xml

@@ -1,13 +1,15 @@
 <?xml version="1.0" encoding="UTF-8" ?>
 <class name="VoxelModifierSphere" inherits="VoxelModifier" xmlns:xsi="http:https://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../../../doc/class.xsd">
  <brief_description>
+ Voxel modifier that uses sphere shape.
  </brief_description>
  <description>
  </description>
  <tutorials>
  </tutorials>
  <members>
  <member name="radius" type="float" setter="set_radius" getter="get_radius" default="10.0">
+ Radius of the sphere.
  </member>
  </members>
 </class>