Dmitry Andreev @and_coder

started inciprocal, ex-lucasarts, ex-electronic arts, ex-demoscener "and"; engineer / inventor / entrepreneur inciprocal.com San Francisco, CA Joined March 2011

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Dmitry Andreev @and_coder

2 days ago

Damn Google with their new Android 16k page alignment requirement... Spent 3 days and a lot of chatgpt-ing to get all Qt and other native libraries reconfigured and recompiled. So of the configs and libs were 10-15 years. All worked great though - don't touch if it works!

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Dmitry Andreev @and_coder

4 days ago

Test fitting custom micro motor case for Tilta CPL

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Dmitry Andreev @and_coder

a week ago

Got some CAD parts of a custom Tilta CPL micro-motor worked out and 3D printed to test the fitting. It's almost injection molding friendly but some modification will be needed for sure. Especially the addition of draft angles.

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Dmitry Andreev @and_coder

2 weeks ago

Still find it using regular 3D art tools like Blender much easier for initial design and proxy fitting. This will be re-modelled with proper CAD software to get all the STEP files for manufacturing. But I got the functional prototype working with off-the-shelf breakout parts.

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Dmitry Andreev @and_coder

2 weeks ago

Sometimes it takes a lot of trial and error to get something right. This was me getting the right gear prototype 3D printed. 24 tries on the left just to get printer settings right. Another 8 to get the slicer do the right things. So 32 tries just to get a single gear.

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Dmitry Andreev @and_coder

3 weeks ago

First pass prototype complete. Got all the gears worked out as well as the PID control optimized specifically for quick 90 degree rotations as fast and as smooth as possible. It now takes Tilta CPL 1/4 of a second to switch with minimal noise. Shrink electronics down next...

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Dmitry Andreev @and_coder

3 weeks ago

A little setup for Hall tuning and calibration. Got full quadrature decoding for extra precision. It now has 3794 ticks per 360 degrees of the whole filter. 1/10 of a degree precision. More than enough for accurate CPL positioning.

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Dmitry Andreev @and_coder

3 weeks ago

A little python script I did a while back to capture the screen, run OCR on that to get the values from a RAW tool and then average the result. One trick is that you can't average K (Kelvin) temperature as it's non-linear but it's inverse is. So average 1/K and inverse the sum.

inciprocal @inciprocal

3 weeks ago

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Dmitry Andreev @and_coder

3 weeks ago

To all RAW image processing devs: When implementing custom White Balance pickers do allow much larger sampling windows, hundreds or even thousands of pixels. All images have noise that messes it up and you have to average over much larger areas. 32 pixels is nothing @RawTherapee

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Dmitry Andreev @and_coder

3 weeks ago

Taking a little step back from steppers and looking into closed-loop servos. This little micro-DC motor has significantly more torque than the best micro stepper out there and I tested a bunch. Going brushless would be the next step though I need to test it to destruction.

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Dmitry Andreev @and_coder

a month ago

While buying a lot of LED stuff from a factory that supposed to be a single manufacturing batch there are still quite a few spectral discrepancies here and there. Most likely messed up at the packing stage or something. You can see a few that clearly have different temperature.

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Dmitry Andreev @and_coder

a month ago

The rolling shutter artifacts (stripes) are due to all-lights-on-preview mode that has 100Hz-ish PWM. The actual per-lights shots are artifact free.

inciprocal @inciprocal

a month ago

The rolling shutter artifacts (stripes) are due to all-lights-on-preview mode that has 100Hz-ish PWM. The actual per-lights shots are artifact free.

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Dmitry Andreev @and_coder

a month ago

These consumer cameras like Sony Alpha 1 can be pushed all the way to 20 fps, but being rolling shutters drops the exposure to 1/60th that's not ideal. Higher speed global shutter ones like Sony a9 III can run much faster but they are only 24 MP that's not that great for props.

inciprocal @inciprocal

a month ago

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inciprocal @inciprocal

2 months ago

Setting up some figurine scanning with a 24-Light Arc

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Dmitry Andreev @and_coder

2 months ago

Okaaaay .... this must be the longest queue I've ever seen. Is this USSR already?

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Dmitry Andreev @and_coder

2 months ago

This time it bothered me hard enough while calibrating our new 180 degree 24-light Arc rigs that I finally put some time to simplify the light positioning process further. Simpler gizmos for manual mode as well as automatic highlight tracing.

inciprocal @inciprocal

2 months ago

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Dmitry Andreev @and_coder

2 months ago

the only thing with consumer cameras is that you can only get this speed with SD or CF cards that you'd have to swap every few props. While MV cameras car stream all raw instantly.

inciprocal @inciprocal

2 months ago

the only thing with consumer cameras is that you can only get this speed with SD or CF cards that you'd have to swap every few props. While MV cameras car stream all raw instantly.

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Dmitry Andreev @and_coder

2 months ago

Took 3 days and a dozen takes to finally get all the multi-cam calibration worked out. We had single-cam multi-light and Light-stage-like multi-cam multi-light where everything is static. It felt like an easy thing to do but ran into a lot of little gotchas.