CSGMesh material and CSGShape inherits from GeometryInstance

I left the material on CSGMesh because GeometryInstance's material override prevents the normal material behaviour of the csg meshes

but the material_override is useful, and now you can control the shadow, lod and other properties you get from GeometryInstance

modules/csg/csg_shape.cpp

@@ -724,6 +724,7 @@ CSGBrush *CSGMesh::_build_brush() {
 	PoolVector<bool> smooth;
 	PoolVector<Ref<Material> > materials;
 	PoolVector<Vector2> uvs;
+	Ref<Material> material = get_material();
 
 	for (int i = 0; i < mesh->get_surface_count(); i++) {
 
@@ -760,7 +761,12 @@ CSGBrush *CSGMesh::_build_brush() {
 			uvr_used = true;
 		}
 
-		Ref<Material> mat = mesh->surface_get_material(i);
+		Ref<Material> mat;
+		if (material.is_valid()) {
+			mat = material;
+		} else {
+			mat = mesh->surface_get_material(i);
+		}
 
 		PoolVector<int> aindices = arrays[Mesh::ARRAY_INDEX];
 		if (aindices.size()) {
@@ -866,6 +872,18 @@ void CSGMesh::_mesh_changed() {
 	update_gizmo();
 }
 
+void CSGMesh::set_material(const Ref<Material> &p_material) {
+	if (material == p_material)
+		return;
+	material = p_material;
+	_make_dirty();
+}
+
+Ref<Material> CSGMesh::get_material() const {
+
+	return material;
+}
+
 void CSGMesh::_bind_methods() {
 
 	ClassDB::bind_method(D_METHOD("set_mesh", "mesh"), &CSGMesh::set_mesh);
@@ -873,7 +891,11 @@ void CSGMesh::_bind_methods() {
 
 	ClassDB::bind_method(D_METHOD("_mesh_changed"), &CSGMesh::_mesh_changed);
 
+	ClassDB::bind_method(D_METHOD("set_material", "material"), &CSGMesh::set_material);
+	ClassDB::bind_method(D_METHOD("get_material"), &CSGMesh::get_material);
+
 	ADD_PROPERTY(PropertyInfo(Variant::OBJECT, "mesh", PROPERTY_HINT_RESOURCE_TYPE, "Mesh"), "set_mesh", "get_mesh");
+	ADD_PROPERTY(PropertyInfo(Variant::OBJECT, "material", PROPERTY_HINT_RESOURCE_TYPE, "SpatialMaterial,ShaderMaterial"), "set_material", "get_material");
 }
 
 void CSGMesh::set_mesh(const Ref<Mesh> &p_mesh) {

modules/csg/csg_shape.h

@@ -38,8 +38,8 @@
 #include "scene/resources/concave_polygon_shape.h"
 #include "thirdparty/misc/mikktspace.h"
 
-class CSGShape : public VisualInstance {
-	GDCLASS(CSGShape, VisualInstance);
+class CSGShape : public GeometryInstance {
+	GDCLASS(CSGShape, GeometryInstance);
 
 public:
 	enum Operation {
@@ -187,6 +187,7 @@ class CSGMesh : public CSGPrimitive {
 	virtual CSGBrush *_build_brush();
 
 	Ref<Mesh> mesh;
+	Ref<Material> material;
 
 	void _mesh_changed();
 
@@ -196,6 +197,9 @@ protected:
 public:
 	void set_mesh(const Ref<Mesh> &p_mesh);
 	Ref<Mesh> get_mesh();
+
+	void set_material(const Ref<Material> &p_material);
+	Ref<Material> get_material() const;
 };
 
 class CSGSphere : public CSGPrimitive {