Collapsed to a Point

Six in the morning, and the takeaway fan#

The session had been left running overnight, building twelve cars.

They are fictional to the badge, generated by a Python script in Blender rather than bought in, and they are modelled off 323 photographs of real second-hand adverts, which is how you end up with right-hand drive, a proper cowl, and doors and boots that open. The whole set builds and exports headless in about thirty-one seconds. James went to bed with his eyes gone from reference images and left it to it.

What woke him at six was the extractor fan on the takeaway outside, not the cars. He checked them anyway. They had come out well, well enough that he spent breakfast giving notes rather than starting again, and the notes came fast: the dashboard too big, the front seats sitting too far back, the rear headrests poking up through the back windscreen, the parcel shelf standing still while the tailgate lifted over it. He wanted the shelf on its strings, the way it is in a real hatchback. He also wanted twelve different interiors rather than one interior twelve times, which is fair, because a fleet of identical cabins reads as wallpaper the moment you look through two windscreens at once.

The agent, Claude Code Opus 5, working through two editor servers, took all of it and rebuilt the packaging around a standard set of measurements instead of a slab across the cabin: wheel centre behind the cowl, hip point derived from knee room, backrest hinge landing on the B-pillar. Then a table of per-car cabins, read off the advert galleries. Fabric or leather. Hooded binnacle or flat fascia or a tablet stuck on top. Manual, automatic or a rotary selector. Rear bench or two buckets. It was the right answer and it was answering the wrong question, but that would not surface for another two hours.

The handle that was not connected to anything#

One of the notes was that the interior door handle was not attached to the door.

That reads like a placement problem, and it was treated as one. The armrest and the pull were made to measure the door's local depth at their own height, because the tumblehome, the way a car's sides lean inward towards the roof, had been leaving them floating an inch clear of the trim. That fix was real and it was needed.

It was not the fault. The door card, the trim panel on the inside of the door, did not exist. None of them did.

Blender's mesh library gives a newly created vertex an index of minus one until something tells it otherwise. There is an obvious-looking call for this, and it is the wrong one: ensuring the lookup table does not assign indices. Updating the index does. The copy routine that builds every inner liner in the car read the index straight off the new vertices, got minus one for all of them, and welded each liner onto a single point. Every door card, every tailgate liner, the whole boot tub. Twenty-seven thousand of the interior's thirty-seven thousand triangles had no area at all.

It survived because nothing complained. The build ran clean. The renders looked fine, because what is not there does not draw. Nine other liners did come out correct, and that was the confusing part until it was not: those parts happen to have a mesh operation run over them on the way through, and an operation assigns indices as a side effect. The ones that went straight from creation to export were the ones that vanished.

What caught it was a guard nobody had put there for this. Unreal drops zero-area triangles on import, so the imported bounds came back four to eight per cent smaller than the figures the exporter had written down for the same mesh, and the import script compares those two numbers as a matter of course. A car being four per cent smaller than its own manifest is not a plausible rounding error. That is the whole detection story. Rockstar have somebody whose job is to open the asset and look at it. Here the asset is checked by a script written for a different reason on a different day.

What Rockstar's people are not allowed to say#

After breakfast he read X, and X was full of GTA 6. A large quantity of the game's assets had leaked, and Rockstar had posted a reminder to the people who built it that they are not to mention their involvement until 19 November. Then a video from somebody who had been to a preview at Rockstar HQ, going through the open questions. No casino has been mentioned. No job you can clock on to has appeared in anything released or leaked. Hunting for profit is confirmed. The fishing is catch and release.

That is the sort of thing that decides a Sunday.

The jobs line is the one worth arguing, because it is the one Second Chance already answers. There is a refuse and fly-tipping shift you clock on to and get paid for, and a job at the pub. There is a council bin lorry working a terraced street with two loaders on the kerbs, their lift technique corrected by a man who does it for a living. The e-bike for the takeaway delivery gig is finished, down to the charge lights on the battery, and the gig itself is being built around it. A world where you are out on a release programme and can go and do a day's work in it is a different proposition from a world where the work is a cutscene about somebody else's life.

And the NDA is the other half of it, which is James's own observation and the best line he has had in a fortnight: the people who built the biggest game in the medium are under orders to say nothing about it for two months. This one publishes every week, screenshots and faults included, and would be delighted if more people talked about it. Being small is why the whole build can go out in public. Nobody has to approve it.

A colour that had never been set#

The gambler at the roulette table had been wearing clothes made by hand in Blender. They came off, and customised Fab garments went on. The other man got customised MetaHuman clothing, and looks considerably better for it.

Then the trainers, which took the rest of the evening. James set their colour in the MetaHuman editor, came back to them later, and reported that it had reverted.

It had not reverted. It had never arrived.

A material instance in Unreal can inherit every value from its parent and hold none of its own. This one held none of its own: zero overrides on the whole instance. A script had read the colours off it, saved them, read them back identical and reported success, and all of that was true and none of it meant anything, because the readback returns the inherited value and cannot distinguish "set to this" from "never set at all". The character edit had gone onto the character at ten to five. The outfit assets it should have reached had been built at twenty past four, half an hour earlier, and nothing rewrote them.

The sole was a separate fault and a better one. Black went on the upper and the sole stayed white, and two confident explanations came and went: one parameter turned out to control the laces, and flipping another moved the sole by 3.7 sRGB, which is nothing. The actual cause was a painted wear overlay shipping at 0.95 strength, washing the sole pale regardless of what colour it was told to be. Taking it to zero dropped the sole band by 21.6 sRGB with the upper unmoved.

The method is the reusable part, and it is duller than looking: crop the same box out of the before and after frames and take the mean. A 3.7 difference and a 21.6 difference look identical on a screen.

The capture script that produced those frames had raised the editor to Epic quality and never put it back, which is why the room was reporting itself 1.5 to 2.2 GB over the video memory budget on an 8 GB card for the rest of the session. Pair every override with its restore, in the same script.

An eye eleven millimetres inside a head#

The gym was the middle of the day. A mile running, then half an hour in the pool, which was warm. Outside it was warm and windy, and they were putting the fair up on the recreation ground next door, so there were people stood watching the trucks come in with the rollercoaster.

The animals got the afternoon, for the same reason as the trainers: they are seen close up now. A long-lens rig was built so each species can be photographed properly instead of squinted at across a field, and the first otter through it had no eye. Just fur where the eye should be.

Every mammal eye in the set was seated inside its own head. The otter's was eleven millimetres in, the vole's eight, the fox's flush with the skin. Eye centres are now pushed out to sit at 45 per cent of their radius inside the surface, and the builder prints where it put each one. While it was open: the legs had been built with seven sides, and a seven-sided tube has 51 degree corners, which is over the 46 degree threshold at which the renderer stops smoothing. Ten sides, and they are legs again.

A light that spawned with its collision on#

The last of it was the delivery job, and it produced the cleanest lie of the day.

A small movable light needed to be spawned into the world while the game is running, and it needed no collision. Setting it to none persisted. The write echoed the new value back. Read the template afterwards and it still said none. Spawn the thing and it comes up with collision fully enabled.

Unreal stores that setting inside a structure that also holds the collision profile by name, and writing to the structure merges rather than replaces, so the old profile survived the edit untouched. On spawn the profile reapplies its own setting over the raw one. The template genuinely did hold the right value. It was overwritten a moment after the actor existed.

The fix is to set the profile by name in the same structure, which is the only way to reach it, because the profile field cannot be written on its own. The wider point is the one that cost the round: for anything created while the game is running, a template readback is not evidence. Spawn it, read the live thing, destroy it.

That was Sunday. The cars are in the engine and the boots open. The snooker went up on YouTube.

mi.get_editor_property("vector_parameter_values")   # count this

(CollisionProfileName="NoCollision",CollisionEnabled=NoCollision,ObjectType=ECC_WorldDynamic)