Unity OnGui Skin - how to assign and the gui skin with c#

So I'm caught at an awkward in between stage where I have successfully created a GUI Skin object (right click assets > create > gui skin) and my gui elements (GUI.Button(etc)), yet my gui elements are not using the skin. 

To get this working I've placed the below line of code within one of my GUI elements. 

GUI.skin = (GUISkin)Resources.Load ("MyGUI");

AND it's essential to put the GUI skin object in to the resources folder within Unity. 

MonoDevelop and Perforce - multiple save prompts issue

I thought it best to add a Perforce version control server to my files.
I am regretting rushing headlong in to this.

Downside/issue/bug - possibly just for Macs..
I am getting THREE 'are your really sure you want to save' prompts after ever edit on every document. And I cannot okay these with keyboard alone.

I don't have a fix, but my current attempted solution is to stop using Perforce... which doesn't seem to work. I am still prompted to save each item. Three times.

Solution - to stop the prompts from occurring ever more

After a bit of trial and error I've devised an approach. Sadly this involves not using Perforce. (I will later try and get this working, but for now, here's a way out).

1. In MonoDevelop choose to compile. This is resulting in the 'Save (file) as...' dialog appearing -- the issue which I want to suppress. 
2. Delete the original file via the file system
3. Click 'Save' to the dialog in (1)

Voila. Dialog stops appearing on every single save. 

Calculating the angle or Quaternion between two points

So I have two sprites and I want one to face the other in a creepy Mona-Lisa-eyes-following kinda way. Just in case I fail to edit this correctly at a later stage, I should mention that I'm m  aking a 2D game, and so I'm actually only interested in rotation around a single axis. 

To do this I...

As input we have the position of two sprites in 3D space, AnnoyingSpriteFacingMe and Player.

The Quaternions is how Unity stores rotations, and so it is with these that we play.

Some code. In this example I am calculating the angle which the attacking boat should be on in 2D space in order to fire its cannons at the other boat.

public Quaternion desirableAngleForFiring(Vector3 attackingBoat, Vector3 defendingBoat){

// from a from and a to calculate the angle, then add 90

Vector3 targetDir = defendingBoat - attackingBoat;

float angle = (float) Mathf.Atan2(targetDir.x, targetDir.z) * Mathf.Rad2Deg;;

return Quaternion.Euler(0, angle+90, 0);

}

OnMouseDown and OnGUI seem to not be working too nicely

I have an unexpected road block; I have a 2D world with GUI objects (like buttons). I click a button, 10% of the time the OnMouseDown kinda gets stuck and, after my GUI action executes successfully, sends an OnMouseDown to the world layer and a sprite responds.


THE PROBLEM
I'm using a 2012 mac book pro, where you can lightly tap the mouse or heavily tap the mouse to obtain a mouse click. The problem seems to be linked to light clicking. 

THE SOLUTION
??

MY SOLUTION
Click properly. I guess I was "using it wrong" - sorry Apple. 

Detecting something close

I need a unit to enter a zone.

For this I have added colliders to objects. Then when they collide stuff happens.

NavMesh Layer causing my sprites/agents to kinda vanish

I've encountered a weird problem. When I add a NavMeshAgent to an entity then place this on my NavMesh terrain then I can't see the NavMeshAgent. Well...kinda.

It's like I'm losing one of the six sides that make up the gif map.

My solution: since I'm working on a 2D game I hacked it so my units are shaped a bit differently and have a different side facing up...far from graceful, but it works.

Moving around

NavMesh seems to provide 'layers' which I can specify which sprites (/agents) can 'walk' on these. 

There is then some cool stuff built in to Unity which allows these sprites to auto-path to a location; really handy stuff to have out of the can*

*only available in pro version. 

I have also started exploring the concept of Terrain. I'm still not 100% sure on how to get my wonderful GIF in to a world that I can use. Still, I shall experiment around making a terrain a layer and seeing if I can leave it two dimensional. 

Very simple moving and rotation

Moving an object:

float y = (float) speed * Time.deltaTime;

transform.Translate(new Vector3(0, y, 0));

Rotation, where Bearing is an Enum I created:

Quaternion target = Quaternion.Euler (0, 0, (float)bearing);

        // Dampen towards the target rotation

        transform.rotation = Quaternion.Slerp(transform.rotation, target, Time.deltaTime * speed);;

Maps

So I've created my world as a GIF.
My current challenge: telling what is land and what is water.
My real challenge: creating a path algorithm on where I can and cannot tread. And avoiding other sprites en route.


What next. From a brief google on 'Unity' and 'getPixel' I suspect Texture 2D might have something to help offer.

The goal

So I want to create a 2D game which has elements from my favourite games growing up. I don't want to discuss content in a public forum, but merely how I have approached certain coding challenges as I go along. This is intended slightly more as a self-wiki in case of early onset dementia rather than a guide to all other noobs out there, but I am happy to share.

My goal:
2D game.

Graphic editor for sprites. I'll have relatively static sprites at this stage, changing state very rarely and with cheap graphics when they do. For this I have selected Pixen, an easy, powerful, and surprisingly fun* pixel art tool.

*It's kinda like Minecraft without the 3D, or the hours of mining.

Game editor: Unity 3D. It seems powerful and trusted with a solid physics engine (not that I need that). Only downside is the hefty price tag. Demo for now. Le sigh.

More anon.