add wet parameter, fix selection mask modes

engine/canvas.h

@@ -148,6 +148,8 @@ public:
                      glm::vec3& hit_pos, glm::vec2& fb_pos, glm::vec3& hit_normal, int& out_plane_id);
     bool point_trace_plane(glm::vec2 loc, glm::vec3& ray_origin, glm::vec3& ray_dir,
                      glm::vec3& hit_pos, glm::vec3& hit_normal, glm::vec2& hit_fb_pos, int plane_id);
+    std::vector<ui::Shape::vertex_t> triangulate(const std::vector<std::shared_ptr<p2t::Point>>& points);
+    void project2Dpoints(std::vector<ui::Shape::vertex_t>& vertices);
 };
 
 class ActionStroke : public Action