I had to look up chroma key. I should've know'd already
The Chroma Key process is based on the Luminance key. In a luminance key, everything in the image over (or under) a set brightness level is "keyed" out and replaced by either another image, or a color from a color generator. (Think of a keyhole or a cookie-cutter.) Primarily this is used in the creation of titles. A title card with white on black titles is prepared and placed in front of a camera. The camera signal is fed into the keyer's foreground input. The background video is fed into the keyer. The level control knob on the keyer is adjusted to cause all the black on the title card to be replaced by the background video. The white letters now appear over the background image.
If that's what you're talking about 8,8,8 is the threshold point. Below is masked out; above is not.
> does the texture wrap around the object
No, not like you're thinking. Models are mapped to textures so you have control over their appearance.
Related to this, I have quite a few suggestions after running the last beta. It'll take me a bit to put it together. Meantime, if you've done much terrain editing, I'd like you to send me this file... along with anything else you want me to have a look at.
As for future tracks, let's cross that bridge when we get to it. This one has been interesting since you're working in tracked2 and ordinarily I'll use traxx and other programs... so yea, it's been kinda fun.