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    Measuring TopSpin!

    Yeah.. playsight will calculate wind as spin also if the ball leaves the sight of the analytic camera upwards then the reading will be way off.
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    Measuring TopSpin!

    Playsight is using math to back calculate the spin. It uses the speed reading and trajectory to figure out where the ball should be if it was flat and then the actual location to determine how much spin would be needed to make that happen.
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    Swing Vision AI line calls and Analysis

    I did a brief 10 minute test this afternoon and the upgraded analysis is much much better than it was. Kudos to @swupnil for producing this at this price point. He basically just destroyed everything else.... I did have a question, I used my buddies XS Max to do the recording and it made me...
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    Swing Vision AI line calls and Analysis

    New version dropped yesterday, big enhancements. I'm going to try it this afternoon. I'd like to hear about anyone's experience using either an Ipad Mini 5 or an Iphone SE to run this. I don't use apple products so I plan on buying the cheapest option that will still do the job. The Ipad Mini...
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    The best insoles

    I switched over from using custom orthotic plates(carbon fiber) with the 5 mm kingfoam insole ontop to the thick kingfoam custom orthotic that you bake in the oven. It took me a while to adjust but they're really in a good groove now. I played 2 hours of singles yesterday and then again today...
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    Real 4.5 match play

    I need to see some grind it out rallies where they're not getting open court. Maybe a second serve or a backhand at some point? They have some good strokes but I can't really evaluate their game from highlights.
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    What do you think about the evolution of sport science with regard to Federer?

    Ever consider that maybe it's the ginormous amount of money that they've made? Federer was probably the first in the history of the tour who could afford a personal 747 with a full training team, medical staff and chef etc. He can literally fly from city to city with an entire crew, a hyperbaric...
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    One Handed Backhand vs Two Handed Backhand

    I keep my off hand on the throat to preload tension. If I get jammed with a ball I'm not prepared for I simply block it high with my left hand. It helps obviously that my old 2 handed backhand used a semi western grip so grabbing the throat has the same face orientation that I'm used to.
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    One Handed Backhand vs Two Handed Backhand

    I can hit out breaking ball off my cross court 1hbh that is much harder to reach as compared to my inside out forehand. My backhand may be doing slight less 55mph vs 60 mph on the forehand but it's nasty because it's going to push you deep into the alley. I trained the crap out of my inside out...
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    One Handed Backhand vs Two Handed Backhand

    I use the same grip on both sides. It saves me a lot of time.
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    One Handed Backhand vs Two Handed Backhand

    Heavily right hand dominant players will almost always hit crap 2h backhands. I spent 3 years hitting weak 2 handers. The first time I got serious and tried to rip a cross court 1hb it was like magic.
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    Puncture marks are visible on both Rafa's knees

    If his knees required draining at this event(based on lack of recent playing) and the softness of the clay then this might be the last rodeo. There's no way his knees should be that bad off with just 2 tournaments on the books in 8 months. His total court movement was less than Thiem's one match...
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    Puncture marks are visible on both Rafa's knees

    Science has come a long way in the last decade. I will say that clay is easier on the cartilage but harder on the quad tendons. The cartilage is what wears out... so maybe his dedication to clay is paying off over the long haul.
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    Querrey Has Gone James Bond!

    Why are the threads getting locked?
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    Swing Vision AI line calls and Analysis

    @swupnil indicated to me that a couple of new features should be coming in 7.5 so I was curious to see if they made it into the final build.
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    Swing Vision AI line calls and Analysis

    I noticed 7.5 came out yesterday. What improvements did you release in this build? I'm still trying to decide what the cheapest possible route is for me to get an apple device(I hate giving them money).
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    Tips for not destroying the body on hardcourt?

    First, stop using NSAID's. They destroy cartilage. There has been a lot of research done in the last 10 years and your body needs inflammation to restore articular cartilage and tendon/ligament. Tylenol if you absolutely need something or the IPA option... I indulge multiple times per night in...
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    4.5: Josh v Scott

    I'm not saying that you should remove all topspin but you need to drive it directly at the corner without hitting up on it unless you're late and the ball has already fallen too much. If you're in the court to hit a short ball then your goal should be to take away time. An arcing topspin ball is...
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    4.5: Josh v Scott

    You're not going to win many matches against any opponent unless your forehand is able to penetrate the court and drive them off of the baseline. I'd start every match with some exploratory balls to figure out the conditions(ball quality, temp, humidity, wind) and then try to decide what type of...
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    How long shall Nadal continue to win RG?

    Everyone needs to remember that Rafa is riding high on 6 months of vacation. If he restricts his play to Clay and grass then he might look like this full time for the next few years. Old knees don't like the 6 month hard Court season.
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    Noels chances for taking over the slam count

    Keep in mind that fast court tennis(AO, Wimb) is heavily dependent on footspeed and serve. Both of those seem to be on the decline for Djokovic. Rafa thrives on the slow courts which seems to favor his style more as he ages. As long as the sand paper conditions persist at the US Open and RG...
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    Swing Vision AI line calls and Analysis

    Sorry, the dead link is in the comments of the formula on the website with the calculator. I have no idea where it came from. I went back and searched for threads on the donthireddy.us calculator and read your posts on it. I experimented heavily with different combinations to make that formula...
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    RG WTA player runs out of rackets

    Gut falls apart in the extreme moisture. It just shreds and separates. The clay holds the moisture and sticks it to the ball and string. They're so dependent on their exact setups that they go with it knowing that it's likely to fail. Maybe they could spray it down with string paint to make it...
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    This French Open is too cold (8° C)

    I don't think they mind playing in the cold.. it's the risk of stiff muscle injuries and the fact that the ball doesn't bounce. They should have a cold weather ball available with extra air pressure and less weight. The problem is just so rare.
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    Swing Vision AI line calls and Analysis

    Do you make use of higher resolution recording or is it fixed to 1080p? The reason I was shying away from an Ipad full is due to the size and difficulty of hanging it on the fence. I was considering an Ipad Mini. Now I'm lookin at an Iphone SE since it has the wide angle camera.
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    Swing Vision AI line calls and Analysis

    Hey, if I was going to buy an apple device to run this app, what would be the best option for me? I'm assuming you've tested all the various combinations. Which device(outdide of the full size ipad) handles the recording/processing the best and can last the longest? I also have(from using the...
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    Prince Phantom 100x / Something weird about the specs.

    I moved from a Phantom 100 O3 to a 100x O3.. it definitely has more pop but nothing like a tweener. I think it's on par with a Tour 100T. My ground strokes are noticeably deeper and I've played some of my best tennis with it.
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    Swing Vision AI line calls and Analysis

    Just digging into your serve speed calculations a bit more. Are you reporting average ball speed(as measured by distance/time) or using the advance formula to figure out head velocity at impact? import math # published numbers from a now dead link KNOWN_SERVE_SPEED= 120. KNOWN_SPEED_AT_BOUNCE=...
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    Swing Vision AI line calls and Analysis

    The frames not existing makes sense. I thought you were recording at 60 fps(since all the apple devices can) and then only processing every other frame to save compute cycles. I completely understand how the speeds are off with only 30 frames. The strike frame and impact frame landing before or...
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    Swing Vision AI line calls and Analysis

    I've done quite a bit of experimenting using Playsight/In.Out/High speed Go Pro to tabulate some of my statistics. What's the particular reason that your serve analysis can't go back and look at all frames and update the speed metrics? I understand that if you're skipping frames to save power...
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