Allow to use CSG without nodes

Add CSG shape resources.
Add CSGTool for CSG operations.
Make CSG nodes using CSG resources and CSGTool.

doc/classes/CSGTool.xml

@@ -0,0 +1,48 @@
+<?xml version="1.0" encoding="UTF-8" ?>
+<class name="CSGTool" inherits="RefCounted" version="4.0">
+	<brief_description>
+	</brief_description>
+	<description>
+	</description>
+	<tutorials>
+	</tutorials>
+	<methods>
+		<method name="add_primitive">
+			<return type="void" />
+			<argument index="0" name="primitive" type="CSGPrimitiveShape3D" />
+			<argument index="1" name="operation" type="int" enum="CSGTool.Operation" default="0" />
+			<argument index="2" name="xform" type="Transform3D" default="Transform3D(1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0)" />
+			<argument index="3" name="vertex_snap" type="float" default="0.001" />
+			<description>
+			</description>
+		</method>
+		<method name="commit">
+			<return type="ArrayMesh" />
+			<argument index="0" name="existing" type="ArrayMesh" default="null" />
+			<argument index="1" name="generate_tangents" type="bool" default="false" />
+			<description>
+			</description>
+		</method>
+		<method name="create_trimesh_shape" qualifiers="const">
+			<return type="ConcavePolygonShape3D" />
+			<description>
+			</description>
+		</method>
+		<method name="get_aabb" qualifiers="const">
+			<return type="AABB" />
+			<description>
+			</description>
+		</method>
+	</methods>
+	<constants>
+		<constant name="OPERATION_UNION" value="0" enum="Operation">
+			Geometry of both primitives is merged, intersecting geometry is removed.
+		</constant>
+		<constant name="OPERATION_INTERSECTION" value="1" enum="Operation">
+			Only intersecting geometry remains, the rest is removed.
+		</constant>
+		<constant name="OPERATION_SUBTRACTION" value="2" enum="Operation">
+			The second shape is subtracted from the first, leaving a dent with its shape.
+		</constant>
+	</constants>
+</class>

modules/csg/config.py

@@ -17,6 +17,13 @@ def get_doc_classes():
         "CSGShape3D",
         "CSGSphere3D",
         "CSGTorus3D",
+        "CSGBoxShape3D",
+        "CSGCylinderShape3D",
+        "CSGMeshShape3D",
+        "CSGPolygonShape3D",
+        "CSGPrimitiveShape3D",
+        "CSGSphereShape3D",
+        "CSGTorusShape3D"
     ]
 
 

modules/csg/csg_gizmos.cpp

@@ -324,16 +324,16 @@ void CSGShape3DGizmoPlugin::redraw(EditorNode3DGizmo *p_gizmo) {
 			}
 		}
 	}
-
+	CSGTool::Operation op = static_cast<CSGTool::Operation>(cs->get_operation());
 	Ref<Material> material;
-	switch (cs->get_operation()) {
-		case CSGShape3D::OPERATION_UNION:
+	switch (op) {
+		case CSGTool::OPERATION_UNION:
 			material = get_material("shape_union_material", p_gizmo);
 			break;
-		case CSGShape3D::OPERATION_INTERSECTION:
+		case CSGTool::OPERATION_INTERSECTION:
 			material = get_material("shape_intersection_material", p_gizmo);
 			break;
-		case CSGShape3D::OPERATION_SUBTRACTION:
+		case CSGTool::OPERATION_SUBTRACTION:
 			material = get_material("shape_subtraction_material", p_gizmo);
 			break;
 	}
@@ -352,14 +352,14 @@ void CSGShape3DGizmoPlugin::redraw(EditorNode3DGizmo *p_gizmo) {
 		mesh->add_surface_from_arrays(Mesh::PRIMITIVE_TRIANGLES, array);
 
 		Ref<Material> solid_material;
-		switch (cs->get_operation()) {
-			case CSGShape3D::OPERATION_UNION:
+		switch (op) {
+			case CSGTool::OPERATION_UNION:
 				solid_material = get_material("shape_union_solid_material", p_gizmo);
 				break;
-			case CSGShape3D::OPERATION_INTERSECTION:
+			case CSGTool::OPERATION_INTERSECTION:
 				solid_material = get_material("shape_intersection_solid_material", p_gizmo);
 				break;
-			case CSGShape3D::OPERATION_SUBTRACTION:
+			case CSGTool::OPERATION_SUBTRACTION:
 				solid_material = get_material("shape_subtraction_solid_material", p_gizmo);
 				break;
 		}