Re: Getting weight values for given points...

[Sergio Mucino]

Thanks all. Sorry for the late replies. We've been having email problems all morning. Yes, that was the problem I found earlier today. I just had to parent everything to a new object and subtract this parent's global position from each null's object position, and it works. I don't think that's the way I'll set it up in the rig, but at least, now I know what I'm dealing with. Thanks all! On 30/01/2014 12:48 PM, Alok Gandhi wrote: Hi Sergio, This works for me. To clarify on the position attribute position of the Get Closest Location, it is the position within "Object Space" or local from where you want the find the location data on the geometry. Since in your case, it is a null, hence the position on the null in the local space is always (0, 0, 0) as there is only one position which is the null itself. Please check this image for my setup: http://imgur.com/e88KKx2 On Thu, Jan 30, 2014 at 12:25 PM, Kostas Strevlos <kst...@gmail.com> wrote: now it makes sense then! I've read/know that the closest location returns values in global space, I assumed that the feeding positions should be in global space as well. Thanks Gray, this cleared up things! On 30 January 2014 17:17, Grahame Fuller <grahame.ful...@autodesk.com> wrote: Position inputs for geo queries like Get Closest Location are local to the object with the ICE tree. (Ditto for positions returned from locations.) So if the ICE tree is on the null and you want the closest location to the null, then (0, 0, 0) is indeed the input position you should use. gray From: softimage-boun...@listproc.autodesk.com [mailto:softimage-boun...@listproc.autodesk.com] On Behalf Of Kostas Strevlos Sent: Thursday, January 30, 2014 12:06 PM To: softimage@listproc.autodesk.com Subject: Re: Getting weight values for given points... Hi, I had a quick test as well and I got the same issue. The only way I could get it to work is by leaving the position input at 0,0,0 (on the closest location node). This is probably due to what Stephen suggested? Although since the ice tree is on the null I don't think is possible to convert the grids points to a global space, cause the closest location is only asking for a geometry. Now I don't want to confuse you so try leaving the position 0,0,0 on the closest location (even though it doesn't make much sense) and see if you are getting the correct result. Otherwise there must be a more sensible way to approach it. I'll leave that to the experts :) Kostas On 29 January 2014 23:11, Stephen Blair <stephenrbl...@gmail.com<mailto:stephenrbl...@gmail.com>> wrote: Hi Show the locations as points. Maybe you are mixing up global/local positions? On 29/01/2014 5:59 PM, Sergio Mucino wrote: Thanks a lot Alan! Seems to be working, but I don't seem to be getting the right values. As a test, I created a grid object and painted a brush stroke on a weight map on it. I then created 3 nulls and positioned them in space floating over the grid. I know which ones are floating over an area where there are no weights, and which ones are over an area with weights. I've enabled Show Values in the ICE tree to see which values I'm getting, and the numerical values reported do not match the value of the weight map area directly under each null. Am I going all wrong about this? Thanks again for your help! [cid:image001.gif@01CF1DB5.2DF4FCB0] On 29/01/2014 5:28 PM, Alan Fregtman wrote: First of all, you probably wanna use a "Get Closest Location" instead of "Get Closest Points"; that way you can get locations between points (say inside a polygon) and expect a useful interpolated result instead of the closest vertex specifically. ICE locations are based on barycentric coordinates and they magically interpolate the values of the nearest triangle's points that the location location is inside of. So say if you have an equidistant triangle with two points at 100% and one at 0%, if you get the location lookup at the perfect center of it, it should return a weight of 50%. Anyway, from the location "Get Closest Location" gives you, plug it to the Source input of a GetData node set to "cls.WeightMapCls.Weight_Map.weights" -- which assumes your cluster is the default name of "WeightMapCls" and your map the default name of "Weight_Map". Change accordingly if not. That should return you the correct weight value. On Wed, Jan 29, 2014 at 4:50 PM, Sergio Mucino <sergio.muc...@modusfx.com<mailto:sergio.muc...@modusfx.com>> wrote: This is probably not that hard to do, but I haven't really worked with arrays in ICE, so I'm kinda stuck here. I have a bunch of nulls near a poly surface. This surface has a weight map painted on it. I'm trying to get the weight map's value for the closest point to each null. I've already got a Get Closest Points node for each null connected to the poly surface I'm sampling for, and I'm also getting the weight values for the weight maps. However, I don't know how to connect one to the other, so that I could say "For each point returned by the Get Closest Points node, give me the weight from this weight map, average them, and return to me the resulting value" (this part I can do... I'll just set it on an attribute on each null). This sure looks to me pretty straightforward (in my optimistic mind). Any help is appreciated. Cheers! -- [cid:image001.gif@01CF1DB5.2DF4FCB0] -- -- --