Before I got into #hamradio I never really grasped the full meaning of the tag line of the HAMRADIO category of #sdf's bboard...

The existence of an #ASDA supermarket chain implies the existence of an #SDFS one.

I was playing with #SDFs while on a flight. I needed to figure out the distance of a point from a line, something I'd ordinarily do a quick search for and implement based on my findings. Without wifi, I thought "surely this is basic college stuff, I can figure this out." I did not figure it out, although I reminded myself of a lot of linear algebra. My math skills have gotten _very_ rusty! (Hint: if q is the point nearest p on line l, then l and pq are ⟂ so the dot-product is zero)

Mathematical/procedural image/shader: https://www.shadertoy.com/view/csB3zy It's a raymarched SDF, as usual: #Mathematics #SDFs #raymarching #procedural #shader 2022-11-07 01:57:38 UTC

RT @iquilezles: New "Painting with Maths" (loooong) video in Youtube: https://youtube.com/watch?v=8--5LwHRhjk Made in Shadertoy (raymarched SDF): https://shadertoy.com/view/WsSBzh #Mathematics #SDFs #raymarching #procedural #shader 2020-11-28 01:09:55 UTC