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Comment Re: drone ship landings require a lot less fuel? (Score 1) 103

I have the front panel of the VAX 11/780 used to render that scene hanging on my wall, but I got to Pixar after that project. This year and last I've contributed some designs that will fly on a FEMA satellite, and a long time ago did a little work to support the Biosciences mission on the shuttle.

Comment Re: drone ship landings require a lot less fuel? (Score 1) 103

I don't need to stand by the rotation theory. However, the 2.5 degrees that the Earth rotates are about equivalent to the downrange distance.

The first stage is going about 1/5 of the target LEO orbital velocity at separation. While you might well model the trajectory as a parabola over flat ground, given the lack of fuel I would expect that SpaceX puts a lot more care into their trajectory. So far I've failed to attract the attention of the person responsible for Flight Club, the most trusted modeling of SpaceX flights, but I'll message him directly.

Comment Re: drone ship landings require a lot less fuel? (Score 1) 103

Well, Alastair, you should probably not get snotty and ad-hominem, unless you want me to comment on how a one-time sci-fi author and the Unix guy at Dish doesn't really have more authority than the random person one might find in the SpaceX group on Reddit.

It happens there are a few people over there who are rocketry professionals, have the math, and have followed SpaceX long enough. So, sure, their opinion can indeed be trusted.

So far, we have a suggestion from one of the lesser folks there that raising the apogee takes advantage of the Earth's rotation. We'll see if we get the attention of the right people.

Comment Re: drone ship landings require a lot less fuel? (Score 1) 103

It seems to be a common misconception that orbital mechanics somehow knows when you are in orbit and does not work otherwise. But that is as silly as saying that relativity only works near light speed. These things always work regardless of speed, it's just that their effects are macroscopic at greater speeds.

Comment Re:google chrome sleep mode? (Score 1) 376

While I didn't find the news article I thought I had read, I did find the Chrome extension 'The Great Suspender', which indicates it 'Automatically suspends unused tabs to free up system resources'. Just installed it in the hope it actually helps - BTW I have no involvement in the creation of this extension, but it does appear to be open source: https://github.com/deanoemcke/...

Comment google chrome sleep mode? (Score 1) 376

Wasn't Google Chrome (the browser) meant to introduce a sleep mode to background tabs? Does anyone know whether that was introduced or whether I am confusing the browser product?

At the same time Google Chrome often shows up as 'using significant energy' on my MacBook Air, under MacOS 10.11.5. Has anyone done any profiling to see what aspect of Google Chrome is consuming the CPU? BTW I am one of those tab hoarders, but apparently not as bad as some.

Comment Re: drone ship landings require a lot less fuel? (Score 1) 103

Here's an illustration of the boost-back to RTLS trajectory. You can see that it very definitely goes up. And to prove from observation, you can actually see where the two trajectories separate in photos from yesterday's launch. It's a rather dim curl up, and another continuing East, in Jason Ruck's photo and John Kraus's photo.

At the speed of stage separation, they rocket isn't going fast enough to stay in orbit, but it is definitely in the regime where orbital mechanics has a macroscopic effect. If you think about it, this is going to be the case at some reasonable fraction of orbital velocity.

Comment The perspective of a 3D animation professional (Score 5, Interesting) 302

This is just like the way people whined that color film had ruined the medium, and the ones before them who whined about talkies and yearned for the days of silent films.

I started at the NYIT Computer Graphics Laboratory in 1981 and left Pixar in 2000. These days I produce or am on screen once in a while.

While I was at NYIT they weren't story oriented, and thus all you see of them is demos. Pixar, on the other hand, always put story first. We knew that we could not make a film stand up on effects alone.

Today, a good 3D animation house can make absolutely any scene they like. And thus there isn't anything special about doing so. It's there if it needs to be there to tell the story, and not otherwise.

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