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Danny Chapman

@rat-face.bsky.social
60 followers 44 following 34 posts

Procedural/physical animation at Epic Games, previously founder at WeightShift & lead Euphoria dev at NaturalMotion. Wrote PicaSim (R/C flight simulator). I play the concertina, cello and bandoneon. Based in Oxford (UK).

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Danny Chapman @rat-face.bsky.social · 17/12/2025
"Can you pet the octopus?" www.youtube.com/watch?v=Zu0S... by @andidev.bsky.social
youtube.com
Roris' Garden - Meta Quest Unreal Physic Control Rig Sandbox
YouTube video by AndiDev
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Danny Chapman @rat-face.bsky.social · 12/12/2025
It also uses a totally non-standard (and unintuitive) icon for the sun, and an ugly (unbalanced) icon for rain+cloud. By giving an hourly forecast at this range, it misleads regarding accuracy.
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Danny Chapman @rat-face.bsky.social · 12/12/2025
The blue/beta version has a more distant location, crams ALL the information in the bottom half of the screen, shows six times, but only up to 10am, obscures what is shown with an unnecessary overlay, and only shows a subset of the info - not useful at all unless I scroll vertically & horizontally.
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Danny Chapman @rat-face.bsky.social · 12/12/2025
Here are screenshots from the live and beta versions, from a few days ago, for a forecast two days away. The former distributes the info cleanly and evenly using the whole screen, at my correct location, with all relevant info at six times, across the entire useful day, without me needing to scroll.
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Danny Chapman @rat-face.bsky.social · 12/12/2025
My talk at #UnrealFest Stockholm on #ControlRig physics in #UnrealEngine has just been released: youtu.be/HennjwB6zZ8?...
youtu.be
Control Rig Physics: Fast, Fun, and Expressive Character Animation | Unreal Fest Stockholm 2025
YouTube video by Unreal Engine
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Danny Chapman @rat-face.bsky.social · 29/11/2025
#UnrealEngine #ControlRig - duh!!
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Danny Chapman @rat-face.bsky.social · 27/11/2025
Lyra recommends: How to rig a dog leg in #ControlEngine dev.epicgames.com/community/le...
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Randall Munroe @xkcd.com · 08/04/2025
Tariffs xkcd.com/3073
256312018707
Danny Chapman @rat-face.bsky.social · 08/04/2025
2. The current/Trump-inspired administration has clearly and intentionally increased the actual magnitude of the first two terms, and has dramatically increased the perceived magnitudes.
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Danny Chapman @rat-face.bsky.social · 08/04/2025
1. I'm half way through listening to this, which is horrifying. The question for me is, as a potential traveller to the US: "Is CostOfDetention*P(detained) - BenefitOfTrip * (1 - P(detained))" +ve or -ve? www.theguardian.com/news/audio/2...
theguardian.com
Is it safe to visit the US? – podcast
Adam Gabbatt reports on the visa and green-card holders being held in US detention centres
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Danny Chapman @rat-face.bsky.social · 01/04/2025
That's actually quite funny!
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Andreas - Match Tree, Wishlist on Steam 🐑 @andidev.bsky.social · 21/03/2025
Heute abend auf twitch.tv/ard findet die Preisvergabe für den Puls GameJam statt. Es wird spannend in 5 Kategorien. Es sind einfach tolle Spiele entstanden.
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Danny Chapman @rat-face.bsky.social · 03/03/2025
Obviously not - it's a hero rat: eu.usatoday.com/story/news/n...
eu.usatoday.com
Are giant rats the future in sniffing out wildlife trafficking? Watch the rodents at work
Eight giant African pouched rats were able to detect four wildlife samples from 146 non-target items during this four-year study.
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Danny Chapman @rat-face.bsky.social · 03/03/2025
Whenever there's an internet outage here I always do a little ratty web search to check if it's back. But... is this the most horrific episode of Dexter ever?!
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Danny Chapman @rat-face.bsky.social · 25/02/2025
Definitely better to see photos of a pretty boat than your blisters!
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Daniel Holden @theorangeduck.bsky.social · 25/02/2025
Learned a new spring fact from my colleague @rat-face.bsky.social recently. For a critically damped spring tracking a target moving at a constant velocity, the amount of time the spring will lag behind the target is given by "halflife / ln(2)". Added to my blog post theorangeduck.com/page/spring-...
theorangeduck.com
Spring-It-On: The Game Developer's Spring-Roll-Call
Computer Science, Machine Learning, Programming, Art, Mathematics, Philosophy, and Short Fiction
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Danny Chapman @rat-face.bsky.social · 07/02/2025
You could fit a couple of cats in that gap instead. Much more useful.
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Danny Chapman @rat-face.bsky.social · 29/01/2025
As in - All the right notes, but not necessarily in the right order...
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Danny Chapman @rat-face.bsky.social · 29/01/2025
My best typo ever. How did that happen?!
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Danny Chapman @rat-face.bsky.social · 19/12/2024
@chrisbrooke.bsky.social Does this count as a credit or debit on my #FestiveBrookeEntryTax bill?
Dog and cat lying side by side on the tummy of a long suffering owner as he tries to sleep on the sofa
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Danny Chapman @rat-face.bsky.social · 16/12/2024
Very impressive (and fun!) demo: metamotivo.metademolab.com/demo
metamotivo.metademolab.com
Meta Motivo
A first-of-its-kind behavioral foundation model to control a virtual physics-based humanoid agent for a wide range of whole-body tasks.
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Danny Chapman @rat-face.bsky.social · 07/12/2024
Rats are lovely. But protesting against films with bad rats is silly. They should just make a film showing how nice they really are.
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Danny Chapman @rat-face.bsky.social · 06/12/2024
It's a sample project for a big open world, but one of the nice things is that the assets were created by the community. I wasn't involved, apart from right at the end when took a look to help get some physics working! I believe the project will receive ongoing improvements too.
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Danny Chapman @rat-face.bsky.social · 06/12/2024
Not at all. Three abreast requires an extra 2m of road/lane width (assuming cyclists are 1m apart), and can be very hard to find on many roads. Three inline requires you to overtake a formation that is maybe 8m longer - but that is only one second if passing at 15mph faster than the cyclists.
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Danny Chapman @rat-face.bsky.social · 06/12/2024
UE sample Project Titan is now available, and it looks great (I don't care if I'm biased!) - www.unrealengine.com/en-US/news/t...
unrealengine.com
Download the Project Titan Sample Game
The Project Titan Sample Game is now available! Dive in and explore this huge open world environment created with 4,000 developers and artists in an epic collaborative art jam over the course of 10 we...
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Danny Chapman @rat-face.bsky.social · 25/11/2024
And here's another. I called him Ed (after the Labour politician). Wireframe shows the target motion.
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Danny Chapman @rat-face.bsky.social · 25/11/2024
Just stumbled across this old video by accident (from WeightShift days) - I remember having fun with this chap!
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Daniel Holden @theorangeduck.bsky.social · 23/11/2024
My latest article is about one of my favorite techniques in graphics - Müller's method of Polar Decomposition. It also details some variations, including one which is ~2x faster to compute with more regular convergence. theorangeduck.com/page/variati...
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Danny Chapman @rat-face.bsky.social · 18/11/2024
I loved your talk at the physics dept a few Saturdays ago - an exceptionally memorable telling of the universe's story, and a reminder that our spines _should_ tingle whenever we think of it!
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Joseph Conlon @josephpconlon.bsky.social · 18/11/2024
I'm a physicist and I don't major in complex emotions, but when I think about my subject my spine tingles. Me reading from my book. Let's see how this compares to the other place. (Split in two as videos have to be less than 60 secs)
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Danny Chapman @rat-face.bsky.social · 18/11/2024
It's so hard to pick a favourite here - they're all adorable :)
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Thomas Geijtenbeek @tgeijten.bsky.social · 18/11/2024
Now that Bluesky has native video support, I figured it's time for a repost: Teaching a biomechanical model to run using reinforcement learning. New results coming soon! #BiomechSky
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Danny Chapman @rat-face.bsky.social · 17/11/2024
His Dark Materials - this is the bit where Mrs Coulter shouts "Lyra!", and I sit up straight and quiver, but Lyra just carries on snoring. #NervesOfSteel
Dog called Lyra sleeping and snoring whilst Mrs Coulter shouts "Lyra" in a scary voice
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Danny Chapman @rat-face.bsky.social · 17/11/2024
I'm going to pinch this for when I have to write the docs for it :)
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Remco Nijs @remconicedev.bsky.social · 13/11/2024
Wanted to showcase some of my early experimentation with the physics control plugin in Unreal Engine. Physics control allows direct tweaking and modifying of a physics asset's "ragdoll behavior" on a bone-per-bone basis through blueprints, making it modifiable in runtime and highly customizable!
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Caleb Longmire @clongmire42.bsky.social · 14/11/2024
Do you like Gameplay Animation and want to learn more about how it works? Well we just released an update to our Game Animation Sample project for #UE5 .5! Get it here - fab.com/s/46a85e1ef0c5 P.S. You may have to remove local content in the EGL library in order to get the 5.5 version.
fab.com
Game Animation Sample
This project showcases fully functional animation systems that are commonly needed in games. It is built using current best practices and can be used for learning or to help you kickstart your own cre...
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Danny Chapman @rat-face.bsky.social · 14/11/2024
It's funny how, after 18 years or so of living with cats, it's impossible not to hear the "meow" when watching your little clip, even with the sound off! Greetings from Meg:
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Michiel van de Panne @mvandepanne.bsky.social · 08/11/2024
Control physics-based characters at interactive rates to climb over tables and more. No learning! Key ideas: (a) partwise MPC: switch between full-body and factored body-part MPC as convenient; (b) strategy guidance via sparse contact keyframes. SCA 2024 www.cs.ubc.ca/~van/papers/...
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Danny Chapman @rat-face.bsky.social · 12/11/2024
Derek Sivers is a smart guy and likes rats. I approve. t.co/ZTYiMdM8wh
t.co
https://sive.rs/rats
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Danny Chapman @rat-face.bsky.social · 12/11/2024
choose between sacrificing my principles, or my daughter. I know I'm incredibly fortunate for that to be an option (and am happy to pay the VAT on our choice) - I hope she does too! We should just access to decent state schools, as an investment society makes in its future.
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Danny Chapman @rat-face.bsky.social · 12/11/2024
I visited. Next nearest is Swan - that was brand new at the time, and we considered it. Glad we didn't go for it, as it is loathed by the kids we know going there (detentions for only scoring 80% in tests, detentions for looking the wrong way whilst walking in corridors etc). So I get to
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Danny Chapman @rat-face.bsky.social · 12/11/2024
One reason is that in some places, state school provision is terrible. Here in Oxford (Marston), we're technically in catchment for an OK state school (Cherwell), but in practice had no chance of getting in. Next nearest is Cheney school, but again marginal, and I found it utterly depressing when.
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Danny Chapman @rat-face.bsky.social · 08/11/2024
I paid my #BrookeEntryTax twice before even realising that it was my civic duty (assuming profile & banner counts), or that there was such a thing as an Intellectual History Starter Pack.
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