Erm, Atero? (Primer)

[Magic.X]

As i said i was working through your Primer in order to get some more knowledge on 3d stuff. Well i figured out that something was missing.

Originally written by Atero
Minimum Blend
Uses the least amount of color between the two frames. I can't
remember where this is used, but it's not usable in effect lists.

Its used in UnConeD's APE's (Picture RendererII and Corlor Map). I'd advise you to either leave this out, or to explain those APE's too.

Originally written by Atero
XOR
Don't know anything about what this is, but it's trippy.

To understand XOR generally we need to know that eXclusiveOR means nothing else than a boolean or - but excluding the and.

The programming code woud be: x xor y = (x or y) and not (x and y)

And here is a tabe to make this more obvious:

x|y|result
-+-+------
0|0|0
0|1|1
1|0|1
1|1|0]

As we know, the color channels are calculated seperately.

Now we imagine x and y to be the two red-channel values.

First, AVS converts them too boolean values which means dividing by 255 and rounding up or down.

That means a color value of 128-255 is 1, a color value of 0-127 is 0.

Then, AVS does XOR, as explained before.
Finally we need to get a useable color value as a result which means multiplying the result with 255.

To put it in a nutshell, a value above 127 and a value below 128 will result in a full valued color channel with 255, if the values are both above 127 or below 128 this will result in color channel of 0.

Well, i could also have pm'ed this but if Atero did'nt know about XOR there are probably more around who don't either.