[vtkusers] manipulation of the scene
Dženan Zukić
dzenanz at gmail.com
Wed Aug 24 14:02:52 EDT 2011
Well, as I said, I don't have experience in manipulating hierarchical scene
graph. I know how it should be done on an abstract level, but I never had to
do it. I would be stabbing in the dark just the same as you are doing it :)
2011/8/24 Kacper Pluta <kacper.pluta at gmail.com>
> Hi, I Used the vtkAssembly hierarchy and i have one new problem. When I
> turn the tree so that new root was in the upright position. It seems to me
> that the coordinates of the new roots are not current after tree rotation.
>
> Part of my code below. And screenshot as an attachment.
>
> root = Tree->GetParts()->GetLastProp3D();
> double *orientation = root->GetOrientation();
> Tree->SetOrientation(0,0,-*(orientation+2)); //left root n the upright
> position
>
>
>
> LeftBranchActor->SetPosition(*(root->GetXRange()+1)+LeftBranch->GetRadius(),*(root->GetYRange())-LeftBranch->GetHeight()/2,0);
>
> LeftBranchActor->RotateZ(angle);
>
>
> RightBranchActor->SetPosition(*(root->GetXRange())-RightBranch->GetRadius(),*(root->GetYRange())-RightBranch->GetHeight()/2,0);
>
> RightBranchActor->RotateZ(angle);
>
> Tree->AddPart(RightBranchActor);
> Tree->AddPart(LeftBranchActor);
> //Tree->SetOrientation(0,0,0);
>
> GenTree(Tree->GetParts()->GetLastProp3D(),--rate,radius*pow(r,1/n));
>
> By the way thanks for your replies.
>
>
>
> 2011/8/24 Dženan Zukić <dzenanz at gmail.com>
>
>> GetMatrix <http://www.vtk.org/doc/release/5.0/html/a01919.html#z4208_1> or
>> GetUserMatrix I guess. Try it and/or read documentation. I never used
>> assemblies until a few days ago, and that was just for grouping.
>>
>> 2011/8/24 Kacper Pluta <kacper.pluta at gmail.com>
>>
>>> How do I get to a particular matrix of element in the vtkAssembly
>>> hierarchy?
>>>
>>>
>>> 2011/8/24 Dženan Zukić <dzenanz at gmail.com>
>>>
>>>> Why don't you use a straightforward tree hierarchy of vtkAssemblies,
>>>> each one having its own transformation matrix, nested under its parent's
>>>> transformation matrix? That way you only need to worry about a branches
>>>> transformation at its parents joint, and the hierarchy does the rest of the
>>>> job for you?
>>>>
>>>> I have not read this, but you may check this out:
>>>> http://www.maplesoft.com/applications/view.aspx?SID=6850&view=html
>>>>
>>>> Also you can try searching "scene graph hierarchy tutorial".
>>>>
>>>> 2011/8/24 Kacper Pluta <kacper.pluta at gmail.com>
>>>>
>>>>> Now I see my mistake. I am using the coordinates of the root, and this
>>>>> is yet another place than the family, which is a part. Except that this
>>>>> knowledge did not give me any more answers ...
>>>>>
>>>>>
>>>>> 2011/8/24 Kacper Pluta <kacper.pluta at gmail.com>
>>>>>
>>>>>> I know but it's not a solution. I want to build 3d tree of cylinders,
>>>>>> and I have a problem with inserting new branches at a right angle. It
>>>>>> is very easy when the root is in the upright position. I tried to do this
>>>>>> using vtkAssembly.The whole procedure is described in the following
>>>>>> pseudocode. I have a problem with an appropriate setting for the
>>>>>> family, after the restoration of the root to its original position.
>>>>>> I thought it would be easier to add new branches without touching the
>>>>>> root. I just manipulating the world coordinate system.
>>>>>>
>>>>>> Attached a part of the tree, which i want to get.
>>>>>>
>>>>>> NODE GenTree(NODE root, int bifurcation)
>>>>>> {
>>>>>> if(bifurcation > 0 && root != NULL)
>>>>>> {
>>>>>>
>>>>>> Restart the angle of Parent root famili if exist;
>>>>>> //(root is part of the family, e.g. the left child of his Parent)
>>>>>>
>>>>>> Restart the root angle;
>>>>>>
>>>>>> //Now root agnel is set to 90 degrees
>>>>>>
>>>>>> //make new bifurcation
>>>>>> Create the children;
>>>>>> Set children position to lower ends of root;
>>>>>> Set children origin to center of root;
>>>>>> rotate the children on Z axis;
>>>>>>
>>>>>> restore root angle;
>>>>>> restore Parent of root famili angle;
>>>>>>
>>>>>> //Make root famili
>>>>>> root->Famili = vtkAssembly::New();
>>>>>> root->Famili->AddPart(root->
>>>>>> Left->BranchActor);
>>>>>> root->Famili->AddPart(root->Right->BranchActor);
>>>>>>
>>>>>> Set Famili origin??
>>>>>> rootate the root famili?
>>>>>> //Now the family is at the end of the root.
>>>>>>
>>>>>> root->Left->Left = GenTree(root->Left,--bifurcation);
>>>>>> //root->Left->Right = GenTree(root->Right,--bifurcation);
>>>>>> }
>>>>>> }
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>> 2011/8/24 Dženan Zukić <dzenanz at gmail.com>
>>>>>>
>>>>>>> If you don't want to manipulate the camera, you can put the whole
>>>>>>> scene into an vtkAssembly and then apply transformation to it.
>>>>>>>
>>>>>>> On Tue, Aug 23, 2011 at 20:03, Kacper Pluta <kacper.pluta at gmail.com>wrote:
>>>>>>>
>>>>>>>> Hi!
>>>>>>>>
>>>>>>>> How do I rotate the whole scene? But I do not mean the camera.
>>>>>>>>
>>>>>>>> --
>>>>>>>> "If you build your empire on money, it'll fall like a house of
>>>>>>>> cards, if you build it on love, you've built Taj Mahal!" - Mark Hartmaier
>>>>>>>>
>>>>>>>>
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>>>>>>>>
>>>>>>>
>>>>>>
>>>>>>
>>>>>> --
>>>>>> "If you build your empire on money, it'll fall like a house of cards,
>>>>>> if you build it on love, you've built Taj Mahal!" - Mark Hartmaier
>>>>>>
>>>>>>
>>>>>
>>>>>
>>>>> --
>>>>> "If you build your empire on money, it'll fall like a house of cards,
>>>>> if you build it on love, you've built Taj Mahal!" - Mark Hartmaier
>>>>>
>>>>>
>>>>
>>>
>>>
>>> --
>>> "If you build your empire on money, it'll fall like a house of cards, if
>>> you build it on love, you've built Taj Mahal!" - Mark Hartmaier
>>>
>>>
>>
>
>
> --
> "If you build your empire on money, it'll fall like a house of cards, if
> you build it on love, you've built Taj Mahal!" - Mark Hartmaier
>
>
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