Algodoo

Is it possible to make an object that will collide with attracting objects but will not move due to an attracting object or move the attracting object? I need the white ring to be 0 mass so it has 0 effect on the gravity, but that deletes the white ring.

Your scene is now working with gravity disabled. Do you want it to work with gravity enabled? I don't understand what you are trying to do with the white ring.

thank you, MoBuilds, Gravitation is very interesting.
Yes, it is prossible to do what you want.
Did you ever use collision-groups?
The white ring should not be attracted but be able to react on collision, right?
one way to do it: duplicate the ring, give the second one negative attraction ( a minus-sign, so it's repulsion) and put both rings on top of each other, and fix them with the F-fixation-tool
A more sophisticated way is to use different collision-groups, i used such to model attraction and repulsion of electric charges (particles of positive and negative charge), so + and + repulse, - and - repulse, + and - attract, - and + attract.

Xray, Im talking about the white ring to not be affected by the gravi. That way the net gravitational pull is not biased slightly toward attraction.

(using built in browser still) Essensially the white ring needs to collide with everything, but not be attracted or repeled by the gravi, Preferably only the gravi. Idealy, the net gravitational pull on collision layer A needs to be 100% controled by the gravi. This includes objects that already have attraction, The problem lies when you try and use objects with attraction: They will attract the white ring along with the gravi, or even pull themselves toward it, causeing the gravitons net effect on the objcet to be partially effected by the white ring, which i do not want. I also want the gravitational pull from graviton to graviton to work without the slight bias the white ring causes.

Edit: I'm trying to fix the graviton-to-graviton now.
I've figured out the issue; the graviton shell needs the only affect gravi, Which i believe i can fix by useing collision layers. This will also greatly reduce the bias for attraction between the gravitons.

There is no way to disable the effect of gravity (what you call "gravi") on each geometry. The collision layers do not affect gravitational attraction at all. Just as in real life, any object that has mass is affected by gravity.

There is something that I tried and seems to work to disregard the pull of gravity on the white ring, and that is to provide a slight opposite thrust against gravity. I was able to essentially make the white ring stand still with gravity enabled by giving the velocity Y axis a small value as follows:

vel = {[0.0, 0.21]} You must use curly brackets on each end of the velocity array in order for Algodoo to continuously give the velocity command. If you do not add the curly brackets, then the object will not continuously oppose gravity. Try this and see if it does what you need it to do. Of course, when you enable gravity, then ALL other objects will be attracted to the ground.

Its not vertical gravity im talking about, its attraction. Also, You say that collision layers dont effect the gravity, However i've noticed that if you have an object with an attraction of 1 on collision layer B, and an object with an attraction of 1 on collision layer A, They will not attract. Neithor will they collide. I want the white ring to not effect the attraction - or be pulled toward - any objects with attraction, and it needs to work on both linier, and quadromatic. However it still needs to collide with objects on collision layer A, while other objects on collision layer A with attraction still effect it.

Like, the attraction you'd put on a geometry. Thats what im refering to when i say gravity here.

Oh, now I understand the confusion. Gravity and Attraction (in Algodoo) are two completely different forces and they react differently from each other. Gravity is not at all dependent on which layers are enabled or disabled. It just doesn't matter! Attraction is like magnetism, and you can think of it that way. And attraction IS affected by which layer is enabled or disabled.

Now that we have that figured out, I will have to think more about what you are asking in order to find out if it can be done. I think it can, but I would need to play with it a bit to be certain.

Alright.