3d Engine-- Tutorial 2 problem.

[ZebraHDH]

Hey, I didn't even realize that you had a forum. I would have asked my question here at the very beginning, so thats for the redirection...

Ok my problem is pretty specific now that have tried to solve it through moving things, and renaming, and reorganizing... but no luck with getting it solved.

http://www.thehazymind.com/archives/2005/06/tutorial_2_crea.htm

I read tutorial 2 and downloaded the source(c# files), then updated my c#, directX, and .NET SDK's... I followed along typing my own code with tutorial 2....When I run the program, it begins to run then goes straight to a "!". I double checked by running your sources, and making the changes to directx and presentParams and such... but I get the exact same problem:

Code:

myDevice.Clear(ClearFlags.Target, Color.CornflowerBlue, 1.0f, 0);

Object reference not set to an instance of an object

I assume myDevice is NULL and it can't be. The Device myDevice is set up the same way as in the tutorial.

I literally am using the exact source code made available. I have no idea what to do, because I don't even see the problem. ::frustrating:: I have come to believe that the error may have to do with something in Visual C# itself. I am not familiar with it enough to know for sure.

Any info that you need from me, to come up with a solution to this I will post ASAP. I am having horrible luck with C# and I would like to start getting somewhere eventually...

Any troubleshooting advice is helpful, considering this could be a simple "why didn't I think of that" type of thing.

Thanks,

Hans

[daku]

I have the same problem.  After a long while comparing code the only thing I could find different about mine vs the tutorial is this:

#region Using directives 

That was missing from my *System.cs at the very top.  I ended up copying and pasting a lot of stuff just trying to solve it,  I dont know if this matters (total noob).  I cant go back to what I originally had to try this one line, but now that it is in there it seems to work.  :\

[daku]

Actually after reading what the #region does that doesnt matter at all.  I was able to run by removing that.  All I can say is that SOMETHING must be wrong because after copying and pasting code from the tutorial in I managed to get it working.  If you can compare yours to the tut someway you might be able to solve it...

[Chr0n1x]

Key reason it won't work is the Clear method is being called BEFORE you create the object, that is, before you call

Code:

myDevice = new Device(...);

Put a breakpoint at that bit of code, in your InitializeGraphics function and see if you get the exception before that. If you do then the flow is incorrect and you need to look through your code. The InitializeGraphics function should run BEFORE Render() so either call it from the Form constructor or make it public and call it in your mainline method before Application.Run().

I hope this helps, usually its a small problem which the compiler doesn't pick up, a logic error, which when you are learning from a tutorial can be easy to make, since this is all new. Sometimes even just copy pasting the code will fix it, and you won't know why.

[tuxdalinux]

also another thing you need to make the engine a class library under the properties, that should fix that problem (had that when i first started this)