Some experiments with finding intersections between triangles.

Tools to help with thinking about how to draw 3D triangles :-)

Triangle fill ported from the driver for my RC2014 VDU.
Now to sort out the drawing order.

Yes, it's a bit of a step back in time. A better CPU than a 1980 home computer, 320x240 16bpp, but still not as good as a GPU, so still need something better than a per pixel sledge hammer using a z-buffer.

Z sorting is def. part of the solution, with additional check only done between triangles A and B when they overlap and zmin(A) > zmax(B). But detecting overlaping is not trivial !

You are right, but since I only want to draw low-poly objects it feels wrong to be doing anything per pixel rather than per vertex, per edge or per triangle.

Badgeware Tufty A smart interactive badge with colour 2.8" TFT display, powered by Raspberry Pi RP2350.

Pimoroni Tufty2350 in C shop.pimoroni.com/products/tuf...

It's the "needs to be convex" constraint that I want to avoid !

That will do "back face culling", but what about overlapping triangles ? Do you use some sort of Z buffer as well ?

@breakintoprogram.co.uk What techniques did you use for hidden surface removal in your Next 3D library ?

I finally remembered how to do rotations properly :-)

I have mastered it several times in the past, but it's one of those things you instantly forget about once the code is working 🤦‍♂️

"I don't know what the programming language of the future for supercomputing will look like - but I know it will still be called FORTRAN!"

Not for the first time, rotations in 3D space are "doing my head in"

Still a youngster then :-)

A bit of 3D fun with github.com/recp/cglm

The rose seeds that have been in my fridge all winter have started to germinate :-)

@pimoroni.com I've been working on a C API for the Tufty2350 display, and the basics are now working :-)

Maybe not very exciting, but it's working :-)

Nearly there :-)

Adafruit Fruit Jam - Mini RP2350 Computer A credit card sized mini computer with DVI output and jam packed with fun hardware.

I might have to get one of these ! shop.pimoroni.com/products/ada...

I'm in unfamiliar territory today. I'm developing a C wrapper for the Pimoroni C++ libraries for the Tufty2350. So far I have some "proof of concept" code running on a PICO2 which calls a C++ class constructor from a C programme.

Today's Start Trek Academy, Wow, just wow.... :-)

Spring is in the air here, so I've been out doing some gardening, well mostly pruning, trimming, dead heading and weeding.

Yes that's how I started :-) I would suggest trying a simple output port next. But you will need to use some clever PIO code to get the access time down when acting as ROM, but I can share some code for that when you are ready.

It's only a bit more work to make the PICO act as a peripheral, or as a block of memory, then you can make the programme loading process much easier :-0)

Do you have any views on the benefits of such a construction ? I'm wondering if the unavoidable slight differencies in construction and mounting of each turn are enough to maybe make the tuning broader ?

Oh, 4 turns "in parallel", that makes more sense :-)

How big was it ? I would have though it was a bit long for 20m. Normally they are < λ/4.

Micro-bore central heating pipe ?