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spf987

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About spf987

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    Steven
  1. Hi Henry, Thank you so much! The polyframe is something I've used a lot in the past few weeks so at least that's something I'm familiar with. Although as I guessed, there is much power to be had from understanding VEX. Longer term goal.
  2. Thanks toadstorm and Noobini, I also I found another example in the end which does it with one point wrangle. I'm trying to figure through all of the methods you've provided. Regarding toadstorm's method, I'm having trouble getting the second point wrangle working. Should the Run Over parameter be set to Primitives? If I leave it at Points then I'm getting an error, regarding undefined variables. Thanks again.
  3. Hi, would anyone please be able to help with the following? I've searched to no avail. I have a curve, followed by resample. I would like to slide all of the extra points along the curve, in a similar way that you can do with one point using the Carve sop. I've been experimenting with the uv attributes and like the Shift sop, but it only moves the point number along, as opposed to the point itself. Ideally at the end point, they 'reset' back to the start of the curve. It's been a while since I used Houdini and I imagine it's the sort of thing you can do easily with vex, but am experimenting with sop solutions. Thanks
  4. Well well well, I had written out a fairly lengthy reply whilst I was trying some more things which I had been researching last night. I'm not sure which of the following was responsible, maybe one, maybe all or a combination, but the short version is, it's working now- both 11 and 12, so many thanks. In case others have such problems: Registry keys: the orginal error I mentioned '..application is configured incorrectly..' was according to some hardware forum people, maybe something to do with it. After having installed and reinstalled various times, it was suggested to remove registry keys in the registry editor, which I did after finding some Houdini related ones. I didn't particularly know what I was doing so I trod carefully. I also installed a Microsoft C++ redistributables 2010 package which I saw mentioned in various places as a its absence would be a potential culprit. Deleted anything and everything with Houdini in its name on the computer on the C Drive, in case there were some strange files from previous non-working versions which were confusing the new ones. There were lots of these. Updated the NVidia driver (again.) Although when I was trying two days ago I definitely had a new driver as I only downloaded it a week ago, yesterday just before I wrote my last post I did a system restore to not long after I did my system reformat I mentioned previously, as that is when I last installed H and it was working. Unbeknownst to me it had also rolled back to the old nvidia driver which I should have realised (though I'd never used the function before so I didn't know), and being quite old, I had to download a newer one again. So now it's 6.14.13.142 (15/05/2012) Plus the security updates which you mentioned last time. Though I thought I had done those and they would be up to date due to having upgraded to XP Service Pack 3 just recently. So, many thanks edward. As I find happens quite a bit, looking over the same problems over and over again seems not to make a difference sometimes, and only when writing them out and asking someone else does it resolve itself. A bit like finding typos in important letters I guess. Thank you!
  5. Thanks for the suggestion Edward- though unfortunately the situation is still the same, at least as far as v11 is concerned, it does install but have missing shelf and other bits and pieces. However, I have managed to get v12 to install, EDIT though it's still unusable.. the viewport background is always white (even on reinstallation), no matter what I change the display setting to; light/dark/COP/disk file, and no geometry can be seen in the viewport, though points, point numbers and normals, plus the gizmos and grid, can all be seen. Changing the viewport mode to wireframe or any of the other options has no effect- still white. Thanks.
  6. Hello, I've recently reformatted my computer, fresh install of everything, and Houdini (Apprentice) now doesn't install/work properly. I have WinXP SP3, Nvidia 8800GT, latest driver from Nvidia site. I had v11 on my machine ok for a few days, but recently it went weird, gave some error message which I can't remember, and then on pressing tab, none of the nodes were there. On reloading, the Shelf had gone too. I've uninstalled, reinstalled all versions of 11 still on the download page, plus I tried v12 too. Many times, always restarting on install or uninstall just to make sure. They all give some variety of an error message during installation, and when I try to run it, the most recent error message (Build 11.1.201) is a windows message: 'This application is not configured correctly', and won't even start. Other builds of v11 did start but there was no shelf. V12 won't even start, there is some brief flicker of a message in the console, maybe to do with the lisence server. V10 build 245 seems to get the furthest, it starts with the Building UI Cache box, then near the end, has a Fatal Segmentation Fault 3292. One of the other builds of V11 was giving messages as in the following link on sidefx forum: (2nd Quote box) http://www.sidefx.com/forum_index.php?page=viewtopic&t=22452&highlight=&sid=c9e0a714b2ccb84693a34801f495b1d3 I've had this computer for years and Houdini has always run fine on it, so it has to be something to with my setup after I wiped it clean. There's hardly anything on it still, Houdini is one of the first programs I installed again. Any ideas please? Thank you. .
  7. Constrain rbd object to a curve?

    Very happy After various weeks on and off trying different combinations and methods both in and outside of Houdini I've at last achieved the effect I need. I had to do the physics in reactor as I was mentioning (also only recently properly achieved) but have managed to use Houdini to solve all orientation problems (which resulted as a side effect of having position-perfect data). I never mentioned the specific orientation problems here as I knew it was something I should be able to solve myself, and a matter of spending time digging through forums, checking out help files and trying to adjust to my situation, and it has payed off. Basic but critical technical bits out of the way, I can get on to the interesting stuff now. I'll continue to use Houdini where I can with this learning project. I'll come back to the curve constraint issue in dops at a later date, but for now though the major milestone is beaten down, it's nearly Friday and it's warm and sunny outside. cheers mangic
  8. Constrain rbd object to a curve?

    Hello- yes it was 3ds max. I think I will have to leave it with fbx as you say until I come up with a better solution. Sorry- the clip i made wasn't particularly descriptive- I should have put a couple of objects on the path like in yours. I will keep trying.. Thanks for your help and suggestions
  9. Constrain rbd object to a curve?

    Hopefully this is visible- The path I've just made renderable in viewport. The rotation you can't tell but at least the position is faithful to the curve and doesn't jump about. abacus2.mov
  10. Constrain rbd object to a curve?

    Hi again, Thanks- that has been my plan B all along and I have indeed been using that method for the past few weeks in a different program and have recently started to do it in houdini- but the results so far for me aren't as good as when I was doing it with reactor. Also, I'm trying to make the movement precise. I managed to smooth the bumping motion/rotation using chops (recently started on Andrew Lowells chops book) a little using filters and so on, but then that always causes the path to move slightly. I've come across in the Constraint Tools Dops a couple of dops - such as AnchorObjectSpace that have under Constraint Type option- 'Constrained to Line'. This sounds promising but I'm still trying to figure out how it works and how you set it up. If it does what I think it might- then I'm wondering if subsequently I could reference something into the xyz fields, so the line is actually a tangent which constantly changes depending on how far the object travels along the path. Of course I may be thinking about this all wrong- even if I was right with that- I'm not sure I could pull it off as I'm still new to all this. Thanks again- EDIT: in fact the method I've been using up until now and that which you mentioned also has it's advantages, because it sort of helps with the next step in my procedure for my project, but again- only approximately- using the abacus example the beads rattle around- the hole in the middle of them needs to be big enough to allow bends in the path otherwise it gets stuck, but at the same time, it's more vulnerable to tiny movements (hence my filtering it with chops). But because this weekend I started to sort out a workaround with respect to the rotation using attribute transfer- I'm hoping if I can get dops objects to follow a curve precisely directly in houdini it will make everything a lot more accurate. otherwise I will fall back to importing the dynamics using fbx and filtering it inside houdini, reexporting etc etc. My final goal would be to make a digitial asset with a 'Select your input curve' affair. Currently I'm not as comfortable with curve creation in houdini as the other package where I've been importing my rail geometry from. I've not mentioned what is I'm actually trying to do yet- as I would like to advance further first..
  11. Constrain rbd object to a curve?

    Hi mangi! Yes- that's the sort of thing I'm talking about- although the rails would need to be curved in the end (such as in the image below). Ultimately it will be for something more complex but using the abacus example is the easiest way to describe it and probably a good starting task anyway. Today I was looking into using wire dynamic objects- they will be useful to me later based on a test I did earlier- but still will be dependent on being constrained to a path. I've been able to make the dynamics bit using reactor and importing using fbx, but I'm trying to shake off my dependence on other software while I learn Houdini- but so far I'm struggling to find a way to do this task. Thanks for your interest-
  12. Constrain rbd object to a curve?

    Hello, Is it possible in Houdini to constrain an RBD object to a curve? So that gravity will still make the object fall, yet its position is always constrained to said path. I've been searching though both forums and in the help and googling but I can't find anything which suggests it's easily doable, nor anyone trying a similar effect. It would be like having beads on an abacus pretty much. If anybody is familiar with reactor, there is a PointPath consraint which does what I'm after. If you constrain an object to a path normally but then make it an rbd object it ignores the path and just falls down. I was wondering whether some complicated mathematical expression would give the same effect, or using expressions to change the direction of gravity based on the point numbers of the curve, but that might be very difficult. Thankyou
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