feat(scenery): models laid along curves (sweep nodes), bent to follow the paths or repeated along them, loaded and saved with the scenery; trainsets put on a path while the simulation runs; trainset turned around by reversed after its header: the first vehicle stays at the offset and leads towards point 1, the rest stands behind it; launcher keeps reversed trainsets and can turn one around; memory cells saved with the new name of the path they name; events tell their targets and the events of a multiple event; renderer tells whether the cursor is over a surface; vehicle placed in the editor entered when the driving goes on

rendering/opengl33renderer.cpp

@@ -5154,6 +5154,7 @@ glm::dvec3 opengl33_renderer::Update_Mouse_Position()
 
 		if (pointdepth != std::numeric_limits<float>::max())
 		{
+			m_mousehit = (GLAD_GL_ARB_clip_control || GLAD_GL_EXT_clip_control) ? pointdepth > 0.0f : pointdepth < 1.0f;
 			if (GLAD_GL_ARB_clip_control || GLAD_GL_EXT_clip_control) {
 				if (pointdepth > 0.0f)
 					m_worldmousecoordinates = glm::unProjectZO(glm::vec3(bufferpos, pointdepth), glm::mat4(glm::mat3(m_colorpass.pass_camera.modelview())), m_colorpass.pass_camera.projection(),

rendering/opengl33renderer.h

@@ -105,6 +105,8 @@ class opengl33_renderer : public gfx_renderer {
         Pick_Node() const override { return m_picksceneryitem; }
     glm::dvec3
         Mouse_Position() const override { return m_worldmousecoordinates; }
+    bool
+        Mouse_Hit() const override { return m_mousehit; }
     glm::mat4
         Camera_View_Matrix() const override { return glm::mat4( glm::mat3( m_colorpass.pass_camera.modelview() ) ); }
     glm::mat4
@@ -387,6 +389,7 @@ class opengl33_renderer : public gfx_renderer {
     std::vector<scene::basic_node *> m_picksceneryitems;
     scene::basic_node *m_picksceneryitem{nullptr};
     glm::vec3 m_worldmousecoordinates { 0.f };
+    bool m_mousehit { false };
 #ifdef EU07_USE_DEBUG_CAMERA
 	renderpass_config m_worldcamera; // debug item
 #endif

rendering/renderer.h

@@ -73,6 +73,7 @@ public:
     virtual auto Pick_Node() const -> scene::basic_node const * = 0;
 
     virtual auto Mouse_Position() const -> glm::dvec3 = 0;
+    virtual auto Mouse_Hit() const -> bool { return true; }
     // editor helpers: matrices/position of the most recent color pass camera.
     // the view matrix is camera-relative (rotation only, camera at origin), matching the
     // camera-relative rendering used by the engine; build object matrices relative to Camera_Position().