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

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.

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.