[Closed] [SDK] issues drawing polyline in viewport

Do anyone of you know how to use the ‘new’ callback function to get it working with nitrous driver?

All I find is:

virtual [void]( http://help.autodesk.com/cloudhelp/2015/ENU/Max-SDK/cpp_ref/maxheapdirect_8h.html#a384e1a581a8ed72444b54add6242c59f)  [RegisterRedrawViewsCallback]( http://help.autodesk.com/cloudhelp/2015/ENU/Max-SDK/cpp_ref/class_interface.html#aff07f7fc451ca5121d8748d8e363795b)  ([RedrawViewsCallback]( http://help.autodesk.com/cloudhelp/2015/ENU/Max-SDK/cpp_ref/class_redraw_views_callback.html)  *cb)=0

And from what I have now is this:

void RegisterRedrawViewsCallback (RedrawViewsCallback *cb)
 {
 	debug->debugDrawWorld();
 }

The function i call is a function from another class I have instantiated.
It does not get triggered… Has anyone of you use this?
I have to admit callback functions are new to me in c++, I’ve used them before in C# and such.

just clicked on the link for RedrawViewsCallback and it took me to the worst api help page I think I’ve ever seen (And I’ve been working with max since version 1), who the fuck is in charge of this crap at Autodesk? absolutely hopeless !

you shouldn’t create your own RegisterRedrawViewsCallback function just your own RedrawViewsCallback object and pass it to the interface function…
something like this…

// create a class
   
   class mycallbackclass : public RedrawViewsCallback 
   {
   public:
   	~mycallback() {}
   	void proc(Interface *ip)
   	{
   	// do something useful
   
   	}
   };
   
   // create an instance
   
   static mycallbackclass mycallbackobj;
   
   // register it usually in the plugin constructor
   
   ip->RegisterRedrawViewsCallback(&mycallbackobj);  

btw theres an example of it being used in PolygonCount sample in the sdk [b]\maxsdk\samples\utilities\PolygonCount

[/b]

// Get redraw views callbacks
class PolyCountCallback: public RedrawViewsCallback
{
	void proc(Interface *ip);
};

// Count the polygons and dislpay the bar graph after every redraw views
void
PolyCountCallback::proc(Interface* ip)
{
	InitFaceCount();
	CountFaces(ip);
	thePolyCounter.DrawBars();
}

PolyCountCallback pccb;

void 
PolygonCounter::Init()
{
	ip->RegisterRedrawViewsCallback(&pccb);
}

void
PolygonCounter::End()
{
	ip->UnRegisterRedrawViewsCallback(&pccb);
}

Thank you so much Klunk! that did the trick!
That triggers now when it’s needed.

And thanks for the great explanation on how to do this.

I have also a small problem with polyline method. I works fine most of the time, but sometimes for some reason it draws my lines always on top, I can’t even reproduce this situation, it happened 2 or 3 times. Is there some kind of parameter like onTop = TRUE / FALSE? I can’t find anything in the documentation.

you probably need to set the correct render limits with GW_Z_BUFFER
like so…

DWORD rlim = gw->getRndLimits();
 DWORD rl = GW_WIREFRAME | GW_EDGES_ONLY | (rlim & GW_Z_BUFFER);
 gw->setRndLimits(rl);

Ok, I will add this and see if the problems appears or not, thanks a lot.

Unfortunately it didn’t help, but now I know when the problem appears – the “draw on top” occurs when I press “7” to show statistics:

if you show your plugins display function we could maybe find a solution otherwise it’s just in the dark guess work

This is it:

class myDrawGrid : public RedrawViewsCallback 
{
	public:
		myPlugin* mod;
		~myDrawGrid() {}
		myDrawGrid() {}

		void proc(Interface *ip)
		{
			ViewExp &vpt = ip->GetActiveViewExp();
			GraphicsWindow *gw = vpt.getGW();
			
			DWORD rlim = gw->getRndLimits();
			DWORD rl = GW_WIREFRAME | GW_EDGES_ONLY | (rlim & GW_Z_BUFFER);
			gw->setRndLimits(rl);

			/*
			a few loops drawing the grid with only setColor and polyline called this way:
				gw->setColor(LINE_COLOR, Point3(1.0f, 0.0f, 0.0f));
				gw->polyline(2, points, NULL, NULL, 0, NULL);
			*/

			gw->enlargeUpdateRect(NULL);
			gw->updateScreen();
		}
};

what happens when you try this ?

class myDrawGrid : public RedrawViewsCallback 
{
	public:
		myPlugin* mod;
		~myDrawGrid() {}
		myDrawGrid() {}

		void proc(Interface *ip)
		{
			ViewExp &vpt = ip->GetActiveViewExp();
			GraphicsWindow *gw = vpt.getGW();
			
			DWORD rlim = gw->getRndLimits();
			DWORD rl = GW_WIREFRAME | GW_EDGES_ONLY | (rlim & GW_Z_BUFFER);
			gw->setRndLimits(rl);

			/*
			a few loops drawing the grid with only setColor and polyline called this way:
				gw->setColor(LINE_COLOR, Point3(1.0f, 0.0f, 0.0f));
				gw->polyline(2, points, NULL, NULL, 0, NULL);
			*/

			gw->setRndLimits(rlim);
			gw->enlargeUpdateRect(NULL);
			gw->updateScreen();
		}
};