New to Irrlicht

magikos · Post by **magikos** » Tue Sep 20, 2005 7:38 pm

Hi everyone, I am new to Irrlicht and I'd like to say I really love it so far. I have just a few questions I was hoping to see answered.

1) I see how to draw a 2D line on the screen, but how do I draw a 2D circle? I need to draw a circle around one of my objects.

2) I need to know what object is under my cursor - I've played with this, but seem to keep selecting my camera node or the skybox node??

3) How do I skin/change the look of the UI elements?

4) How do I know when a UI element has focus or is being dragged, a window element for example?

I humbly request any and all help.

Thank you

Foole · Post by **Foole** » Tue Sep 20, 2005 11:35 pm

For #2, I use the id field when creating an object and the idBitMask field when calling any of the GetSceneNodeFrom functions.

eg:

Code: Select all

	public enum ObjId
	{
		Map = 1,
		Camera = 2,
		OurChar = 4,
		OtherChar = 8,
		Light = 16,
	}

Code: Select all

mNode = Global.Scene.AddAnimatedMeshSceneNode(mesh, null, (int)(IsPlayer ? ObjId.OurChar : ObjId.OtherChar ));

Code: Select all

selectednode = Global.Scene.SceneCollisionManager.GetSceneNodeFromScreenCoordinatesBB(Global.Device.CursorControl.Position, (int)ObjId.OtherChar);

This makes it so I will only get 'other char' objects.

magikos · Post by **magikos** » Wed Sep 21, 2005 12:01 am

Thanks, I see now what I was doing wrong on object selection - however, for some reason I'm not able to get back my mesh object, only my billboard object:

Code: Select all

device.SceneManager.AddBillboardSceneNode(null, new Dimension2Df(10,10), new Vector3D(0,0,0), 2);
device.SceneManager.AddAnimatedMeshSceneNode(planetMesh, null, 4);

Code: Select all

node = device.SceneManager.SceneCollisionManager.GetSceneNodeFromScreenCoordinatesBB(mouse, 2|4);

Any idea what I am doing wrong there?

Thanks again!

magikos · Post by **magikos** » Wed Sep 21, 2005 1:24 pm

Just to give you an idea of where I am going, this is a concept drawing of my application:

And this is what I've got so far...

I have a long way to go.

Foole · Post by **Foole** » Wed Sep 21, 2005 1:48 pm

That code looks ok to me, and the concept picture looks pretty cool

Do you just get a null return value when it should return the mesh?

magikos · Post by **magikos** » Wed Sep 21, 2005 2:08 pm

Right, as you can see I have a sun and a planet. The sun is a billboard (two actually spinning on top of each other in opposite directions to give it a sparkling effect)

Code: Select all

node = device.SceneManager.SceneCollisionManager.GetSceneNodeFromScreenCoordinatesBB(mouse, 2|4);

This code returns the sun when the mouse is over the sun (as expected), however node == null when I am over the planet.

Thanks for the complement on the concept! Now if I can just make it real, that's the big trick! I think I can do it with Irrlicht from what I've seen, it will just take time. I don’t know c++, so I am working with the Irrlich.NET.dll using C#. I can read c++, but I don’t know the syntax so I couldn’t write it.

I really appreciate all the help you are giving me, thanks!

Foole · Post by **Foole** » Wed Sep 21, 2005 9:28 pm

If you call it with the mask set to 4, do you still get null?

magikos · Post by **magikos** » Thu Sep 22, 2005 4:54 am

Yes, I thought to try that, and setting my mesh object to ID 2 and try, both resulted in node == null

magikos · Post by **magikos** » Sat Sep 24, 2005 5:25 pm

Ok, so I thought: "Maybe it’s my actual mesh giving me problems?" I'm using earth.x from the media directory. I changed it to dwarf.x and <BOOM> it started working!

I do wonder though what is wrong with earth.x that prevented it from being detected.

Well, I wasn’t planning on using the example media files as my project grows so that isn’t a big issue. Now to other things in my attempt to build my concept screen.

Thanks for you help, I'll be sure to post again when I get stumped!

Joe_Oliveri · Post by **Joe_Oliveri** » Sat Sep 24, 2005 9:15 pm

That looks nice much like Homeworld, Keep up he work and you will have my support!

magikos · Post by **magikos** » Sun Sep 25, 2005 4:18 am

Thanks Skater, I'm working on the interface now and I'm not sure what’s the best way to do it. I tried using Draw2DImage to put my interface buttons at the bottom of the screen, but it isn’t drawing my image correctly - it somehow degrades the quality. But I'm not sure if this is the best approach in the first place as I don’t know how to detect if my mouse is over a particular button etc.

Can anyone give me some suggestions as to how they would reproduce my concept screen and interface?

Thanks!

pfo · Post by **pfo** » Mon Oct 03, 2005 7:29 pm

Lookin' pretty sharp there Magikos (the concept work), I'm jealous

To help you with some of your questions:

#1 you could plot really small lines and make a circle, although that would be slow.... I'd like to do this myself, I want to rewrite the line drawing code to be faster and allow for curved lines (ellipses, circles) I just use draw2Dline for now

#3 there's a GUIEnvironment call to set the gui skin parameters, and I believe the mesh viewer tutorial shows how this can be done.

#4 as far as I know, there is no way to tell if a window is being dragged, I needed to save window positions when my editting app exited, so what I did is whenever a window receives a focus lost event (or element left event, can't remember) it checks it's current position and updates it internally so that when the app closes it can save this information.

Guest · Post by **Guest** » Sun Oct 09, 2005 1:07 am

can you just dl the dx managed sdk, and draw a circle with that library in the irrlicht window?