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modify the real mesh using Mesh_modifier
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modify the real mesh using Mesh_modifier
by Carsten Haubold
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Hey all,
I set up a "set weight" plugin for the NURBS modeling tools during a tiring lecture, and I faced the problem that I can set the weight to a new value and I see the changes on a black (not selected) curve and the selected one stays the same. As soon as I change the selection my changed mesh is gone, too. I thought that mesh_modifier would do exactly that? How can I have persistant changes? Another thing is: with the multiple property view you need to select NurbsCurveInstance and SetPointWeight from the nodes list and then select the points you want to apply a new weight to. If you select some points of the curve within the viewport and try to switch to the SetPointWeight property to apply the new weight, the selection of the mesh is discarded. So this is kind of unintuitive I think. Cheers Carsten ------------------------------------------------------------------------- This SF.net email is sponsored by the 2008 JavaOne(SM) Conference Don't miss this year's exciting event. There's still time to save $100. Use priority code J8TL2D2. http://ad.doubleclick.net/clk;198757673;13503038;p?http://java.sun.com/javaone _______________________________________________ K3d-development mailing list K3d-development@... https://lists.sourceforge.net/lists/listinfo/k3d-development |
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Re: modify the real mesh using Mesh_modifier
by bART Janssens-2
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On 5/4/08, Carsten Haubold <CarstenHaubold@...> wrote:
> I set up a "set weight" plugin for the NURBS modeling tools during a tiring > lecture, and I faced the problem that I can set the weight to a new value > and I see the changes on a black (not selected) curve and the selected one > stays the same. As soon as I change the selection my changed mesh is gone, > too. > > I thought that mesh_modifier would do exactly that? How can I have > persistant changes? HI Carsten, Glad to hear you are making good use of boring lecture time :) The k3d::mesh_modifier should indeed make persistent changes. If you use the context menu and select your modifier from the "Mesh Modifier" submenu, it should work as expected. If not, I think it's best you show us the code, so we can better help in debugging it. Cheers, -- Bart ------------------------------------------------------------------------- This SF.net email is sponsored by the 2008 JavaOne(SM) Conference Don't miss this year's exciting event. There's still time to save $100. Use priority code J8TL2D2. http://ad.doubleclick.net/clk;198757673;13503038;p?http://java.sun.com/javaone _______________________________________________ K3d-development mailing list K3d-development@... https://lists.sourceforge.net/lists/listinfo/k3d-development |
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Re: modify the real mesh using Mesh_modifier
by Carsten Haubold
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Hey Bart,
What do I need to change so it appears in the context menu? I looked into others like Deformation plugins but did not notice anything special to add them there. I committed it to SVN as it compiles correctly, its in modules/nurbs/set_weight.cpp. Cheers Carsten ------------------------------------------------------------------------- This SF.net email is sponsored by the 2008 JavaOne(SM) Conference Don't miss this year's exciting event. There's still time to save $100. Use priority code J8TL2D2. http://ad.doubleclick.net/clk;198757673;13503038;p?http://java.sun.com/javaone _______________________________________________ K3d-development mailing list K3d-development@... https://lists.sourceforge.net/lists/listinfo/k3d-development |
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Re: modify the real mesh using Mesh_modifier
by bART Janssens-2
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On Sun, May 4, 2008 at 3:31 PM, Carsten Haubold <CarstenHaubold@...> wrote:
> I committed it to SVN as it compiles correctly, its in > modules/nurbs/set_weight.cpp. The interface_list in get_factory is wrong, you should have both imesh_source and imesh_sink. -- Bart ------------------------------------------------------------------------- This SF.net email is sponsored by the 2008 JavaOne(SM) Conference Don't miss this year's exciting event. There's still time to save $100. Use priority code J8TL2D2. http://ad.doubleclick.net/clk;198757673;13503038;p?http://java.sun.com/javaone _______________________________________________ K3d-development mailing list K3d-development@... https://lists.sourceforge.net/lists/listinfo/k3d-development |
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Re: modify the real mesh using Mesh_modifier
by Carsten Haubold
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Ah okay, I fogot to add mesh_sink to the interfaces, I didnt look at that line :)
But the problem still is, when I add the Plugin I need to select it before I'm able to change the value, but as soon as I do that my selection gets discarded and thus the new value is not applyed to any point. Cheers Carsten ------------------------------------------------------------------------- This SF.net email is sponsored by the 2008 JavaOne(SM) Conference Don't miss this year's exciting event. There's still time to save $100. Use priority code J8TL2D2. http://ad.doubleclick.net/clk;198757673;13503038;p?http://java.sun.com/javaone _______________________________________________ K3d-development mailing list K3d-development@... https://lists.sourceforge.net/lists/listinfo/k3d-development |
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Re: modify the real mesh using Mesh_modifier
by Timothy M. Shead
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Carsten Haubold wrote:
> Ah okay, I fogot to add mesh_sink to the interfaces, I didnt look at > that line :) > > But the problem still is, when I add the Plugin I need to select it > before I'm able to change the value, but as soon as I do that my > selection gets discarded and thus the new value is not applyed to any > point. I've committed some fixes to NubsSetWeight, there were several issues worth mentioning: * When you make a selection, then "apply" a modifier, the selection has to be stored somewhere. That somewhere is your modifier, so you will see that it now derives from k3d::mesh_selection_sink, which provides the storage. * When you are a selection sink, you have to "merge" the stored selection with your input before you can test for selections. This may seem a little funny, but it enables us to mix interactive selection with pipeline components that create/modify selections, and it also makes it possible to write modifiers that use *multiple* selections. * You wouldn't have noticed any of this in the deformation modifiers, because they derive from a different base-class that handles these details. * You can't modify your inputs! Const-casting was trying to tell you something here. * A mesh is a three-level hiearchy: mesh -> gprim -> arrays. We do shallow-copying at all levels, so when you go to modify anything, you generally have to create a deep copy of the gprim, and then deep copies of any arrays you wish to modify. Note the calls to k3d::make_unique() that do this deep-copying, and return a non-const object that you can modify. * Selections are floating-point weights in K-3D, not bools. Although it's an under-utilized feature at a UI level, the idea is that modifiers should - wherever reasonable - use the selection to weight their operation. In this case you'll note that I used k3d::mix() to do a linear interpolation between the original and new weights. Since selections are currently all 0.0 or 1.0, this works the way one would expect, but "fuzzy" selections in the future will Just Work also. Cheers, Tim ------------------------------------------------------------------------- This SF.net email is sponsored by the 2008 JavaOne(SM) Conference Don't miss this year's exciting event. There's still time to save $100. Use priority code J8TL2D2. http://ad.doubleclick.net/clk;198757673;13503038;p?http://java.sun.com/javaone _______________________________________________ K3d-development mailing list K3d-development@... https://lists.sourceforge.net/lists/listinfo/k3d-development |
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Re: modify the real mesh using Mesh_modifier
by Timothy M. Shead
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Timothy M. Shead wrote:
> Carsten Haubold wrote: > >> Ah okay, I fogot to add mesh_sink to the interfaces, I didnt look at >> that line :) >> >> But the problem still is, when I add the Plugin I need to select it >> before I'm able to change the value, but as soon as I do that my >> selection gets discarded and thus the new value is not applyed to any >> point. >> > I've committed some fixes to NubsSetWeight, there were several issues > worth mentioning: * In testing, don't apply the same weight to every point and wonder why the results didn't change, as I did ... :) Cheers, Tim ------------------------------------------------------------------------- This SF.net email is sponsored by the 2008 JavaOne(SM) Conference Don't miss this year's exciting event. There's still time to save $100. Use priority code J8TL2D2. http://ad.doubleclick.net/clk;198757673;13503038;p?http://java.sun.com/javaone _______________________________________________ K3d-development mailing list K3d-development@... https://lists.sourceforge.net/lists/listinfo/k3d-development |
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