Re: I'm hear with some geometry... again!
@6
Me having vision up to college helping me parse the diagrams was the point of my post, but perhaps that got lost in the part where I tried to explain perspective.
I tried to write a novel once. In that process I discovered that I couldn't, because knowing how to describe people visually is really important, and even though there are lots of resources and lots of other novels to read and lots of Wikipedia articles on human anatomy, the end result is that sharing common terms required having more vision than I had. Sometimes there are just things where we can't share, or even develop a full understanding, no matter how much people try to explain. I use this as the easiest example because, and no pun intended, things like handsomeness or hair/eye colors that make sense are the easiest places to see it.
Unfortunately 2D projections of 3D shapes is almost certainly one of those. I don't have the reference handy but one of the more reputable "how is blindness cognition different" papers I've seen actually discovered that certain kinds of spatial reasoning are either lacking or managed differently in blind people. No one is giving you a good explanation of perspective because it is something that you develop and take for granted almost before you have language, in the same way you can always know where your hand is. I've actually lost the skill for thinking in perspective as I lost my vision, and even having partial sight meant never having developed this all the way as a kid either. I'm not sure if I could do 3D tactile diagrams now. It's managed almost exclusively by the visual cortex and is even something that is partially reasoned out in the eye itself, as opposed to in the brain. Whether you can brute force your way past it and have something click at some point, I don't know; but I suspect not.
You're also missing many years of practice at visualizing/interacting with a rich and complicated 3D world. The spatial information you have access to via your hands and your cane is maybe 1/100th what sighted people have from the day they're born. Practicing handling around 100 times as much information as you've had practice handling from a very young age when neuroplasticity is at its peak where having that practice literally hard-wires things into the brain gives them a massive advantage that you probably can't make up for.
So: no, there's probably not a great solution. Whatever it is is something that's probably going to be unique to you. But don't feel bad about it, stick with it, and if you do math for long enough you will get to watch the sighted people struggle instead when they hit the point that all the things that give them an advantage right now becomes a disadvantage because they've never practiced doing it any other way.
Also, a fun fact. Computer vision took 20 years to crack and the end result turned out to be summarizeable as "Actually this is really hard. How about instead of trying to figure all this out, we just literally write a digital simulation of the optic nerve as close to the real thing as possible?" plus another 5 or so years playing with that simulation and making it better/more computer friendly, then working backward and figuring out the math behind how the hell it worked. Your eyes aren't just light sensors. They're actually doing a ton of computation on the way to the brain, and one of the reasons we don't have amazing visual prostheses yet is that one of the things we don't actually understand fully is how that computation even works.
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