Algodoo

Thanks for noticing. It also has Spellcheck and language support.

2lololoer,

It's not a magnifier. Read the title. I was trying to make a point. Maybe I'm color blind, but the letters that change to black have very little contrast before the change. I guess if you could see the title, then you would know what this scene is about.

For a magnification effect see BINOCULARS V2 by Xray

Yes, the United States, "the greatest purveyor of violence in the world today", and the only country to have used nuclear bombs in war, should really be the only country to have nuclear weapons because ...?

The U.S. is concerned about North Korea and Iran's nuclear capability but not about Israel's because...?

Maybe no countries should have nuclear weapons. Even if countries didn't have nuclear weapons they would still have nuclear capability, but that may prevent somebody from "pressing the button" at a perceived threat.

Clerk: [Homer grabs for his gun, but the cashier holds onto it] Sorry, the law requires a five-day waiting period. We've got to run a background check.

Homer: Five days? But I'm mad now!

[the cashier pulls the gun away from him]

Homer: I'd kill you if I had my gun.

Clerk: Yeah, well, you don't.

Xray,

Thanks. I used your suggestion.

I set sim.frequency = 1000 for smoother operation and to prevent the ruler from vibrating off the pencils after the pencils have moved.

Nicely done.

Thanks for the suggestion.

Nicely done, but does not work with the latest version of Algodoo, which is now free. I was able to get it to work by moving the wheels closer to the rods, which creates more friction.

I concur.

Looks and works great. That's some serious coding.

I rated this a while ago but didn't comment. I like this scene because the walker looks like it is prancing and because I have not seen any other walkers use this method of propulsion.

"fairly stable over a narrow range" applies only to cheap imitations of this Algodoo anemometer. Put the following in the Air box update event:

_temp = 20.0 + 10.0 * sin(sim.time)

and you will see that the response is fast and accurate over a wide range of unstable temperature.

Similar to Physics Demo 3.

Thanks for the comments. I didn't think your comment was directed at my Algodoo design, but I figured I should test it anyway. It worked out quite well, so I figured I may as well brag about it. If it didn't work out, I probably would not have said anything.

I agree with lololoer on this one. I originally did not comment and haven't rated this scene because I consider it racist. The scene is technically very good, but I think the continent should be some random polygon.

Very cool.

I agree with your suggestion, but the scene isn't very stable. If I adjust the speed to 140 RPM, then it looks a lot better, but the mat self destructs after a few minutes on my PC.

I was looking at this and others and came across this 3D Box. I don't think you can find this using the Algodoo search utility.

I found that one by searching Google Images with the following search string:

site:www.algodoo.com/algobox 3D

I tried out the scene, then saved it as a .phn, opened it in Wordpad, and then looked at the code. After looking at the code I assumed it was all done in code. Now that I think about it, judging by the age of the scene, direct manipulation of the position property was not available at the time. That is probably the reason for the mechanical stages. It appears that RBS16 changes the length of springs to move a vertex as opposed to using the pos property.

Looks good. Works well. Very responsive.

math.vec.dist(scene.my.greenball,scene.my.redball)­

also works

You get a line and I'll get a pole ...

Nice design.

Looks good. Runs smooth. I like how everything is balanced and there is very little vibration even at high speeds.

Nice concept, coding, and effect. I think the simulation frequency is saved with the scene. If you set the simulation frequency to 100 and repost, then users will not need to set the frequency to 100 before running.

The "Help" hyperlink next to the "Add reply" button shows how to add hyperlinks to your description.

How does "The Powder Toy" compare to Algodoo? Is it worth taking the time to learn how to use it?

Nicely done. I didn't realize that could be done. If you wanted to take it one step further then you could loosen the cat and give it some plus or minus x velocity.

Good. I suggest rotating the surfer and board 45° from their present position so that the surfer is heading down the front of the wave.

Helium has a density of 0.005 kg/m2 in Algodoo. These devices have a minimum density of approximately 2.0 kg/m2. Your first statement that "They are so light that they are essentially helium balloons" is false.

What do you think about the code in the "update" event of the circles?

Sounds like you would be impressed with greater complexity, but a simpler solution may be more elegant. You will have to dig deeper to find out how this really works.

I will give you a hint. There is a "red herring" in this scene. Seems like you may have already found it.

Regarding "Very clever using the density value to correct the balance. It may not be the tight control that PID provides, but it does seem to work!":

That code is bogus and doesn't do anything to help the balance. That code is the "red herring" that I mentioned before.

I don't believe you figured it out yet. Let me know if you give up and I will tell you the answer. Here is a hint: ABCDEFGHIKLMNOPQRSTUVWXYZ.

Yes. That is the first time I put fake code in a scene. I thought it would be amusing to see if anybody would catch it. I figured that most users would not look for the code, and those that found the code would assume it worked. I figured (correctly) that you would be the only one (out of thousands of users) who would be inquisitive enough and dig deep enough to find out how it really works.

Thanks for introducing The Powder Toy. It is a cool application with not much overlap in functionality with Algodoo. Regarding electronics, I have found that the Java applet Electronic Circuit Simulator works well.