Blog.CarlRobitaille.org

Indiscriminate laziness

Taking a screenshot 39 years ago

Posted on 2022/01/12 by Carl Robitaille

Taking a screenshot 39 years ago: pic.twitter.com/C4PWFpVqwM
— Jon Erlichman (@JonErlichman) January 8, 2022

Tessellation-Free Displacement Mapping for Ray Tracing

Posted on 2022/01/10 by Carl Robitaille

Tessellation-Free Displacement Mapping for Ray Tracing

With a displacement-centric acceleration structure built upon affine arithmetic, our new #SIGGRAPHAsia2021 paper, presented today by Théo Thonat, explains how to perform high-speed ray tracing, without tessellation. More info: https://t.co/hjRB1HGfAp @AdobeResearch @Substance3D pic.twitter.com/L0DJVsj3Zw
— Tamy Boubekeur (@boubek) December 16, 2021

Repulsive Shape Optimization

Posted on 2021/12/07 by Carl Robitaille

Excited to share *two* papers appearing at #SIGGRAPHAsia2021, on "Repulsive Curves" and "Repulsive Surfaces."

Tons of graphics algorithms find nice distributions of points by minimizing a "repulsive" energy.

But what if you need to nicely distribute curves or surfaces? (1/14) pic.twitter.com/itflstybmJ
— Keenan Crane (@keenanisalive) December 7, 2021

Implicit equation f(x,y)=0 of a triangle with arbitrary vertices

Posted on 2021/12/07 by Carl Robitaille

This is the implicit equation f(x,y)=0 of a triangle with arbitrary verts, that actually computes the exact Euclidean distance from (x,y) to the triangle.

It uses min{} and max{}, which are defined in terms of the absolute value |x|. Code: https://t.co/Tq0QpIjFiI pic.twitter.com/Q8ZJQS0fwX
— inigo quilez (@iquilezles) December 2, 2021

Bouncing from the focus of one parabola to another

Posted on 2021/12/02 by Carl Robitaille

bouncing from the focus of one parabola to another pic.twitter.com/ZYUrtI7ZMA
— Matt Henderson (@matthen2) November 21, 2021

Supersonic parachute deployment at ~Mach 2

Posted on 2021/12/02 by Carl Robitaille

Superb computational fluid dynamics visualization of supersonic parachute deployment at ~Mach 2 from @NASA_Supercomp

These simulations are wildly complex because the deformation of the parachute structure has to be simulated as well as the fluid dynamics pic.twitter.com/wYHO8hTwWV
— Chris Combs (iterative design enjoyer) (@DrChrisCombs) November 19, 2021

Math buildings

Posted on 2021/12/02 by Carl Robitaille

float i,e,a,l,y;vec3 p,q,d=vec3((FC.xy-.5*r)/r.y,-1);for(d.xz*=rotate2D(t*.2);i++<2e2;e=max(min(++y,-e),y-3.)){i>1e2?l=log(e+=1e-4)/1e2,d/=d,o:o+=exp(-e*1e3)/2e2;p=q+=d*e*.7;p++;y=p.y;for(a=3.;a>.04;a*=.6)p.xz*=rotate2D(5.),p=abs(p)-a,e=min(e,max(p.x,(max(p.y,p.z))));}o+=l; pic.twitter.com/Di62BkhnWi
— yonatan (@zozuar) November 19, 2021

The spherical version of the breathing biosphere

Posted on 2021/12/02 by Carl Robitaille

… now the spherical version of the #breathing #biosphere as requested by @isp_uv_es ;-). Standing on the shoulders of #RStats #rgl #rayshader @tylermorganwall and #quadmesh @mdsumner . Shown is seasonal cycle of vegetation #carbon uptake inferred from @FLUXNET_Coop … pic.twitter.com/kiiHRcpkOa
— Markus Reichstein (@Reichstein_BGC) November 4, 2021

What’s the Latest? DLSS 2.3 & How It Keeps Learning

Posted on 2021/11/16 by Carl Robitaille

An update on DLSS 2.3 and learn how we reduced ghosting. The video also includes information about why temporal methods are really powerful compared to spatial-only upscaling. https://t.co/ae3XCqAbo0
— Jonathan Granskog (@jongranskog) November 16, 2021

COVID vaccine video

Posted on 2021/11/16 by Carl Robitaille

https://twitter.com/SamIAm2021MD/status/1459051952831189013?s=20