"Incoming enemy from the rear! Drop altitude!" /random quote

That's just amazing! Sprites you say? If you tell us the dimensions for each of the sprites (in 4grayscale I'm assuming), I'm sure someone could make a couple. 

Whoa this is really neat!  I'm definitely looking forward to the final version.  Is it 15MHz only I assume?

Well, here's what I got. The ship's total width and height is 21, but I think it looks better at that size. I also made a gif for them in action. I tried to keep the sprites needed to a minimum, but I think I might make one more to smooth it out.

That being said, DO A BARREL ROLL!

This is Peppy. All systems go.

This is Peppy. All systems go.

I think he was asking for black-and-white sprites for the characters (because only that 48x48 window of the screen has grayscale applied to it)

Wow, are you guys just that good at spriting that you can draw that stuff? Those look amazing. As soon as I get my pic converter working again, (I had to add in a masking byte), I'll definitely have it doing barrel rolls.

I don't know how to rotate, but head on is pretty simple. The general gist is that you take the verteces, convert them to screen coordinates, and then draw in shapes to connect them.

Just to make a standard, if you are looking parallel to the ground, x increases to your right, y increases as you get lower, and z increases as you walk forward. When I say differences, I am talking about it's value, subtract your own. So its at 5 you're at 2. 5-2= 3 difference.

First, you have to figure out you base length. Which comes from half your screen length/tan(half field of view). So in my case, 48/2 / tan(60/2 = 42 base length. This is the only part that I got from tutorials.

Second, you take your base unit and divide it by the Z difference of the point you are mapping. This will tell you how many standard units it is away, and therefore how big it is. If it is one away, it is normal size. Two away, 1/2 size. 3 away, 1/3 size, and so on.

Then you take it's size ratio and multiply its x and y difference by the ratio. In this step, you might have negative differences, so just be aware of that.

Finally, add half the width or height of the screen to the x and y to get your screen coordinates.

The rest comes from drawing polygons that connect these points on screen.

Now an example.

Point is 120 away, 50 to the right, and 30 above. Screen is 48*48.

48/2 / tan(60/2 = 42 base unit.
42/120 = .35 actual size
50*.35 = 18 relative pixels right
-35*.35 = -11 relative units down
(18+(48/2), -11+(48/2))
(42, 13)

I just have my sis design my sprites. Heck, I can't even draw worth a darn unless I'm going by another picture, then it ends up looking like it was drawn by an 8-year-old.

She hates spriting, though, so she draws it on a coordinate grid on paper and I convert it for her.