I forgot this thread, (didn't click the email button) At any rate I got the model to work the other day, but I don't remember what I did now. Thanks for the reply.

Well the truth is, I had the motors set to sphere, but not the wheels, they were set as default.

I'm having the same issue as rahdad1. When I name the hinge joint in the Controller window (blue field), close the window and then re-open the window, I find that the name is gone. When I hit the play button there is no slider in the pop-up. I'm running Windows 7, Sketchup 8.0.4811 and Sketchyphysics 3.. Thanks for the help.

Ok, now this works. Now I have another problem: I can't read out the frame in the scripted box. if i do so, an error message appears. When I write something like Math.sin(frame/100.00) in the controller of a servo, it works, but if I write setVar("a",frame/100.00) and into the controller getVar("a") the error message occurs. That's really odd... edit: It seems, that my old SP models work well, but if I copy the code into a new Scripted-box ob an object, it doesn't work anymore. Maybe I should get an older Version of SP?

It probably is bad form to reply to your own post but I'll do it anyway. The fix is to use setVar and getVar as often as possible and also to use the @@var form of variables and to avoid global variables ($var)whenever possible.

walmart.com is out of stock, I will call my local store tomorrow. Thanks

Thanks Dan(?) I figured most of this out on my own. I did also figure out the motor orientation thing, I had motors going opposite way. I watched a few youtubes on SP, some, a few times to make sure I was doing it right. Now I need to figure out the keyboard control thing, I don't have a joystick...yet, so I need to make lefty, leftx, righty, and the rightx work, for steering and speed, since in the case of a skidsteer machine these things are directly related to each other. Thanks again!

hadrien_dugas, I figured it out, change the state of the outer tube to no collision, it will work like you want. I drew two concentric tubes and grouped then individually. I then connected a motor to the outer tube. When I ran the simulation I had the same problem, as you, the outer tube rotated but moved up until the bottom inside surface came in contact with the inner tube, outer surface. So thinking like a logical person, I tried to make a "bearing" on the end opposite the motor, then grouped the bearing with the outer tube, with the inner tube running through it. I then started thinking about what was happening. I tried static state for the outer tube, well of course it didn't move at all. I changed the SP properties shape to sphere, no change. I found the no collision state and changed the state of the outer tube to no collision voila' it worked. Video to follow (as soon a get time)

This is a character i created that i would like to rig, if sketchup had a rigging system lke MMD that would be great [image: e3fR_Kylerender1.jpg]

I don't think this can be done. You can assign a "thruster" parameter to your submarine, and then it will travel forward, but it will not be driven directly by the propeller. A propeller works kind of like a screw thread cutting through the relatively low density water*, but won't interact with a surrounding medium in SketchyPhysics in this way. Yes, I know that this is wrong in many ways. Please don't let this spawn a side-discussion on propellors and aerodynamics.

A little bit off topic but I read something about concave hull, and wondered if this concept could be incorporated in Sketchyphysics. That would improve things considerably, I would think.

@physicsman said: Hi, I tried to install the V3.1. And now when I click on joint connector, I still get a message in the top left corner of the SU display "Requires SketchyPhysics 3.1". I use Xp Pro SP2 and SU 8. SP is very impressive and suit to my need, I don't want to forgive!! Please may I have one comment ? Many thanks The message isn't a warning to you. its a warning to other downloaders that they will need sketchyphysics 3.1 to run the model. You will be able to run the sim fine. The message is useful however, double click it and you can edit it to include the instructions to use your model.

http://www.youtube.com/watch?v=wpGpJwlhwck A demo of one way to make a sphere with a hole...

Either the free trial is up or you have lost the activation setting. Had this happen to me, somehow the activation was not current. It was taken care of quickly by Dale. Ken

@tig said: You double posted ! So I deleted one of them. As a new poster please have patience - there are systems in place to prevent spamming that might slow your progress down the first few times, until the system believes you are genuine/human... Also I am moving this thread to the SketchyPhysics Forum where it will receive better coverage/responses... Thanks and sorry for posting twice @unknownuser said: I haven't heard of that one before, what SketchPhysics version are you running? Try deleting the SketchPhysics files from your Sketchup/Plugins folder and try installig it again, preferably version 3.2 http://code.google.com/p/sketchyphysics/downloads/list I removed all even SketchUp. I have downloaded the latest version of SketchUp and SketchyPhysics but the problem has not fixed. I have other computer running in Windows7 and works perfectly but not in mine with XP.

Maybe you could give us an example model if what you have in mind and we can add on a few tricks to simulate an explosion.

The error is unknown to me, usually things like this are fixed by copy/pasting all the elements into a new model so it gets a clean slate. As for movable geometry, yes it can be done but SU has a pretty severe bottle neck on drawing geometry so it will cause alot of extra lag. Wacov's cloth example

Check out http://sketchyphysics.wikia.com/wiki/SketchyPhysicsWiki. To combine joints you will typically need intermediary groups. You can not have non convex colliding single group. You can use fixed joints for that. Face directions are relevant. I suggest look at my grouping in the case. Dumpster Diver-modified.skp

works fine....

Turns out it wasn't that big of a deal getting files to work, so here is one simple example. If you got any questions just ask away. file-output.skp