When making gears the secret is making sure each joint is grouped with an object (not the same object) before using ctrl-click to make the gear connection. If each joint is not associated with its own grouped object the gear pop-up window will not appear. One you have made the connection, use the UI to inspect the first joint and the gear ratio parameter can then be changed in the UI.

Select the object and then click on the "UI" button two buttons to the right of the "Play" button. In the the User Interface that opens, set the density of the object to something low like 0.0001 and the object will be much lighter.

Try this primitive balloon model attached. Well, it is an early form of flight 😛

The next step is to add more thrusters for sideways motion and ruby controllers to adjust the thrust in flight, but the balloon model floats around quite nicely with a nudge. Select the balloon and open the UI to see the thruster parameter. One limitation is that the thruster will not work if the thrust object is grouped with anything else so that is why I have connected the "basket" with a joint and a gyro was added for stability. The altitude can be changed while the simulation is running by holding shift and giving it a nudge up or down, or by slightly adjusting the thrust parameter in the UI and putting the cursor back over the simulation window again.

balloon.skp

An object with an "internal" joint means that a joint has been grouped with the object. Sometimes when repeatedly clicking on a grouped object to select a joint for deletion, the group is "opened" (temporarily exploded to allow access to the internal elements of the group). Occasionally due to an obscure bug, deleting a joint in a group opened in this way shows the joint still existing as an internal element even after it has been deleted. The best cure is to explode the object with the internal joint and re-group the elements. If your model is complex with many physics joints it is normal to have groups which have "internal" joints and is nothing to worry about as long as the joint exists. For example in chain with many links, each link would have one joint on one side as an "internal" joint and the joint on the other side as a "connected" joint. Let me know if any of that helps. If it does not, you will have to provide further details of the problem or upload your model so that people here can better understand the problem and try and help you further.

Ok its finished. Here it is. Thank you to all who helped.

PERFECT.skp

Simply put, emitted objects are not included in the Sketchy Replay.

Because it's tricky business, normally all objects store animation data in their attributes, but because the emitted objects are only temporary the data doesn't exist once they are deleted, so you would need to store data elsewhere, and then keep track of howmany copies are at any time, and which copy gets the right position data,...

Bottom line is it would take a complete overhaul of the current SketchyReplay, this may be a future feature but for now it's not in the works.

awsome, yea, i hadnt noticed why it seemed to crash into something when i had the wheel close

PS im just uploading the file so i can easily transfer it to my other PC later on 😄

Scissor3.1.skp

Dave, youcan move topics between different subforums... 😒

You have the right version(3.2 that is), it's just a couple of miss-typed numbers along the way.
And the "Requires SketchyPhysics 3.2" watermark is only an indication with which version the model was made(your current version), so others know what they need.

cool output. nice models. i like detailed models 👍 . keep it up.

ExtraSensoryPerception--I got none of that.

Soapstar, I'm sure Mr. K's script is better than the mods I made. Hopefully that works for you.

Well you can run a SP simulation with shadows, but it will be considerably slower.

If you however record a SP simulation and play back the animation then shadows won't update, they remain static it seems.
You could use Window -> Shadows -> Use sun for shading, that does seem to work with animations, and it is a whole lot faster.

But for any sort of real shading I would say look up Twilight rendering.

Thank you, this helps!

Yes, the students went through a few class examples of making arms, wheels, moving objects, and eventually to this point. They started with only the arena, that was distributed as a skp file to each of their computers and they built upon them the vehicles.

I have upgraded the model significantly including a sound effect, just for fun.

http://ixian.ca/pics8/railgun.jpg

Thanks much for the help, that did the trick! I'm new to SP and greatly appreciate the assistance this forum provides.

exactly same error i geting after pressing "START"... So after whole day of installing and uninstalling i find that trouble was "clf_simple_loft_01b" plugin. (Error on SU6 and 8 and all SP versions, for me ....(WIN XP,32)) Hope it helps for someone. 😉

Chris has been kind of quiet...I hope all is well. I too think that, though out of date, the wiki still does fulfill a purpose. The power in SP32 really does come from the scripting and slight well timed inputs and examples from people on this site. I presume that Sketchy Physics is kind of a side job for its creators but I sense a powerful tool emerging; SPhysics only seems so hard cause sketchup itself is so intuitive.

Snape them inHang 6 or more cables per hook, Create adjustable width shelf,3 Quick-Latch bungee slots that are the steps you must have to follow