[SP2]Basic Tutorial Posted (Moved & Improved) 5/11/08
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Just changed the address of the tut:
http://sketchyphysicstutorial.googlepages.com/home
I also added two new pages covering the basics of using the UI, setting multiple joints to move at the same time, and some other stuff I've learned.
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Absolutely top notch addition to the tutorial.
The new sections were full of "I didn't know that!!!" and now I gotta play with this.
One minor note, a very common spelling error, in section 6, 1/2 way down, the sentence "NOTE: These blocks are SEPERATE groups" is spelled SEPARATE. I do it all the time.
Also I have not lost interest in this "project". I have been sidetracked back to an unrelated (to SU or SP) project, a patent application which is now in final review before the USPTO application, and there is a lot to do in that. The application is about 75 pages, and part is in a language (legalese) I don't work well in. To quote Arnie, "I'll be back" in about a week or 2.
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Just started using SP and so far your tutorial is the best I have located. i have a question on the UI. When I edit the properties of a joint as you have explained I do not get the same window. My window does not have the UI as you describe with the posibility of the movement slide. My motor setting works as do other atributes but the UI form only has the Controls, Solids, Joints Tools
I can't seem to attach a JPG.
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@moving2time said:
Just started using SP and so far your tutorial is the best I have located. i have a question on the UI. When I edit the properties of a joint as you have explained I do not get the same window. My window does not have the UI as you describe with the posibility of the movement slide. My motor setting works as do other atributes but the UI form only has the Controls, Solids, Joints Tools
I can't seem to attach a JPG.
Make sure you have the right version:
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Why does a pin that is built such that it is located through an opening in a block pass through the block walls when the model is operated as if the block had no mass? I was expecting a colision. Picture a 3D leter "D" with a pin that passes through the opening. I thought that when you ran the animation the pin would sit inside the "D" and you could lift the "D" with the pin but the pin just passes through the walls of the "D". I tried the same thing by opening the "D" up so that it was more like a "G" so that the hole was more like an exterior wall folded inside and it still passes through the wall. Once it passes through it will collide with the exterior walls of the object. I atttached the pin to an arm on a slide to hold and control the pin.
I'm just trying out ideas. This idea could have some usefull applications in curving geometry where an object must slide and rotate such as an inside cam. I may need to build a joint with a slide and hinge to simulate the motion but i was hoping the colision of the two objects would accomplish the cation.
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Without a picture or the skp file, it's hard to see what's going on, but there are two possible reasons for what is happening.
First of all, check the bottom of the shape page of the tutorial. It explains that a "hole" in an object won't behave like a hole unless the object is set to static mesh. But if you want to make the object moveable, the only other way to make a hole is to make the object a "group of groups." (DEBUG your geometry and see what's going on.) Take a look at the pic below, and you'll see the arch is actually seen as a half-circle when debugged.
The other reason is that if the "pin" is not a true 3-D shape, it probably won't interact with the model. If it's just a line, it won't work, instead make it a small cylinder.
Hope that helps, and DEBUG DEBUG DEBUG.
Check out the model below. The "D" objects have their collision geometry turned on so you can see what's happening.
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Actually, I was going to mention the Arch Example because I tried creating the hole with blocks joined together like the arch just because of the comlications shown in the Arch Example. The pin is a cylinder so that shouldn't be an issue. I'm wondering if it would have anything to do with the way an "L" shaped group would look. The "L" is surrounded by a completly encompasing rectangle similar to your arch example when it is grouped. Actually, I'm still not sure why the arch doesn't fill in even though it's created from a bunch of smaller groups. Maybe I am joining my groups wrong?
Thanks for your time!
Joe
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Hey I was wondering whether it's possible to actually make any keys on my computer actual control keys for my car model for example is it possible to make the up arrow the acceleration or the down button reverse the car or the space bar handbrake and so on.
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Would that be the beginning of sketchup games?
Great tutorial here... -
great tutorial i have and will be relying on this tutorial for a while as today i have just begun to use sketchy physics and was instantly hooked.
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Thanks a lot !
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Thanks for the nice tutorial. I think I discovered (the hard way) the difference between making a component of a shape and making a group before adding a hinge or other joint. i.e. groups work with hinges and components do not.
If I have it right, you might add that hint to the tutorial.
Thanks again, it got me going....On another topic, has anyone designed logic gates in sketchyphysics? I am thinking of a mechanical digital computer....with balls for bits and some levers for the AND or XOR gates....did a quick google but nothing popped up right away...
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very nice tutorial
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