the majority of the math is usually quite simple and enjoyable to work with.
https://www.khanacademy.org/ this is a great resource On Mon, Apr 15, 2013 at 2:37 PM, Sam <[email protected]> wrote: > As it turns out, I wasn’t doing the math part wrong, it was something else > in my ice tree that was causing the problem. While I was going through my > ice tree trying to figure out what I did wrong, I accidentally deleted a > node. After undoing it I got this error:**** > > ** ** > > # WARNING : 3000 - **** Cycle breaking point > sphere.polymsh.secondaryshapemarker**** > > # WARNING : 3000 - Cycle through null.null.ICETree**** > > # WARNING : 3000 - Cycle through sphere.polymsh.ICETree**** > > # WARNING : 3000 - PROBLEMATIC EVALUATION CYCLES ARE IN THE SPECIFIED GRAPH > **** > > ** ** > > Undoing the delete should have put everything back to how it was, but now > it wasn’t working at all. So I started going through and deleting all the > excess nodes I had added in the different trees that were for displaying > data (set data self.tmp, etc) and all of a sudden it started working as > expected. I’m thinking that maybe I had more than one reference to > self.temp or something similar, but none of the nodes turned red, so I > didn’t realize it. **** > > ** ** > > The tip to turn on "use global coordinates for display" did solve a lot > of my visualization problems. Having what I was doing work for the most > part but having the vectors appear to be going in the wrong direction was > definitely confusing.**** > > ** ** > > Now that it is working I have noticed something else weird. When I move my > “controller null” the object that is sliding across the sphere will pause > slightly every time it gets to an edge before rotating slightly and moving > along the next polygon. Is this a known issue, or should I be using > something other than Get Closest Location to stick the null on the sphere? > **** > > ** ** > > P.S. I will be watching weeks 6 and 7 shortly =)**** > > ** ** > > *From:* [email protected] [mailto: > [email protected]] *On Behalf Of *Raffaele Fragapane > *Sent:* Sunday, April 14, 2013 8:21 PM > *To:* [email protected] > *Subject:* Re: Creating a vector between 2 objects in ICE?**** > > ** ** > > get an object's kine.global.pos, and get another object's kine.global.pos > Subtract one from the other, that's your displacement vector between two > objects.**** > > Its direction (from A to B or viceversa) is determined by the order of > subtraction, so if it's the wrong way around just plug the other way around > in the subtract.**** > > A Vector has no such concept of what object it's under. It will be in the > space of the object you run the operation from. To display it starting from > such object, if the display is what you are using to determine it starts > from the origin, then turn on "use global coordinates for display".**** > > For that vector to operate on an object other than the one you're hosting > the graph on, you might need to add that object's own position to such > vector before output.**** > > If you need more than just the position, then you have more work to do as > you will need to compose a transform from this and additional derivative > data.**** > > ** ** > > You're hitting a wall again that has nothing to do with ICE or not using > the right nodes or operations, and all to do with not quite understanding > the math fundamentals of the data and operations you're working with :)*** > * > > Weeks 6 and 7 ;)**** > > ** ** > > ** ** > > On Mon, Apr 15, 2013 at 12:17 PM, Sam <[email protected]> wrote:**** > > As the subject says, I’m trying to create a vector between 2 objects in > ICE? Essentially what I want to do is point a null (which is attached to > the closest location on the surface of a mesh) at another object. I’ve > tried several ways, and I just can’t seem to get it to work. It seems that > no matter what I do, the vector is always coming from the origin (0,0,0). I > thought this would be easy, but I’m obviously doing something very wrong.* > *** > > > > > -- > Our users will know fear and cower before our software! Ship it! Ship it > and let them flee like the dogs they are!**** >
