[vtkusers] Noise appears when extreme zooming in
Patricio Palma C.
patriciop at gmail.com
Wed Oct 19 15:27:07 EDT 2016
With vtkInteractorStyleRubberBandZoom::Zoom() I'm having good results, no
noise when getting closer to the structure. However it is easy to go into
the structure. Does VTK provides a way to avoid the camera go into the
visible object?
Thanks
On Tue, Oct 18, 2016 at 3:06 PM, Ken Martin <ken.martin at kitware.com> wrote:
> OK in that case you want to print out the ViewAngle of the camera. It
> could be that the view angle is getting really small leading to some
> issues.
> It might be worth trying to use Dolly instead of Zoom. The difference is
> that Zoom adjust the view angle while Dolly moves the position.
>
> On Tue, Oct 18, 2016 at 1:24 PM, Patricio Palma C. <patriciop at gmail.com>
> wrote:
>
>> Hi Ken, experts
>>
>> I have double checked and the case shown in previous email, do not have
>> coincident geometries.
>>
>> Regarding the interactor, I'm using a custom interactor style (derived
>> from vtkInteractorStyle) that provides a rubber band zoom into the 3D
>> scene. The code shows Dolly() function in custom interactor is calling
>> camera->Zoom().
>>
>> Regards
>> Patricio
>>
>>
>> On Tue, Oct 18, 2016 at 9:49 AM, Ken Martin <ken.martin at kitware.com>
>> wrote:
>>
>>> Are you zooming using one of VTK's interactor styles? or are you
>>> explicitly calling zoom or dolly on the camera? Using dolly() the distance
>>> on the camera should be changing and as you noticed it isn't.
>>>
>>> Since you mentioned you have coincident geometry that can be an issue.
>>> When you have two polygons at the same location the rendering process can
>>> result in a random determination of which is on top. If the coincident
>>> geometry is in two different mappers you can use the
>>>
>>> void SetRelativeCoincidentTopologyPolygonOffsetParameters(
>>> double factor, double units);
>>>
>>> method to move one of the mappers slightly in front of the other.
>>>
>>>
>>>
>>>
>>>
>>> On Tue, Oct 18, 2016 at 1:01 AM, Patricio Palma C. <patriciop at gmail.com>
>>> wrote:
>>>
>>>> Hi Ken, experts,
>>>>
>>>> Thank you for the quick response.
>>>> Regarding point one, SetDiffuse(0.0) was applied to all actors, the
>>>> structure looks darker with no shadows, but the issue still occurs.
>>>>
>>>> About point 2:
>>>> - the actor we use is derived from vtkQuadricLODActor
>>>> - and there are some overlapping geometries
>>>>
>>>> Below is a image of the structure in the beginning. Clipping range,
>>>> position, focal point and distance are shown below
>>>> [image: Inline image 1]
>>>> Debug: Camera clipping range: 3.61282 4.44839
>>>> Debug: Camera position: -1.93487 2.37646 2.48559
>>>> Debug: Camera focal point: 0.0543755 -0.0598546 0.0492757
>>>> Debug: Camera distance: 3.97849
>>>> Debug: Bounds : [ -0.100974 , 0.296875 , -0.08 ] [ 0.08 , 0
>>>> , 0.05 ]
>>>>
>>>> After zooming in a bit, it appears a soft pattern of lines over the
>>>> face of the structure
>>>> [image: Inline image 2]
>>>> Debug: Camera clipping range: 3.61282 4.44839
>>>> Debug: Camera position: -1.92875 2.37186 2.4952
>>>> Debug: Camera focal point: 0.0604954 -0.0644594 0.0588774
>>>> Debug: Camera distance: 3.97849
>>>> Debug: Bounds : [ -0.100974 , 0.296875 , -0.08 ] [ 0.08 , 0
>>>> , 0.05 ]
>>>>
>>>> Finally after zooming in a couple of steps more, it appears noise/lines
>>>> over the face.
>>>> [image: Inline image 3]
>>>> Debug: Camera clipping range: 3.61282 4.44839
>>>> Debug: Camera position: -1.92882 2.37202 2.49498
>>>> Debug: Camera focal point: 0.0604254 -0.0643013 0.0586621
>>>> Debug: Camera distance: 3.97849
>>>> Debug: Bounds : [ -0.100974 , 0.296875 , -0.08 ] [ 0.08 , 0
>>>> , 0.05 ]
>>>>
>>>> It calls my attention that only position and focal point are being
>>>> updated after zooming in.
>>>>
>>>> Thanks
>>>> Patricio
>>>>
>>>> On Mon, Oct 17, 2016 at 8:21 PM, Ken Martin <ken.martin at kitware.com>
>>>> wrote:
>>>>
>>>>> It could be a few things, we would really need more details to narrow
>>>>> it down. Two things you can check
>>>>>
>>>>> 1) maybe a lighting issue, if you change your actors to be only
>>>>> ambient, no diffuse, do you still see the issue?
>>>>>
>>>>> 2) maybe a zbuffer issue, If you zoom too far you can end up with bad
>>>>> (not ideal) zbuffer clipping ranges. To narrow that down
>>>>> - are these Actors or Actor2D, what mapper are you using,
>>>>>
>>>>> do you have overlapping or coincident geometry?
>>>>> - when you see the problem what is the value of
>>>>>
>>>>> - the camera's clipping range
>>>>> - camera's position, and focal point, distance
>>>>> - the bounds of your data
>>>>>
>>>>> Generally you do not want any of those values to be really small or
>>>>> large relative to the square root of the range a float can normally hold.
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>> On Mon, Oct 17, 2016 at 5:28 PM, Patricio Palma C. <
>>>>> patriciop at gmail.com> wrote:
>>>>>
>>>>>> Hi experts, does anybody has any idea of what could causing the issue
>>>>>> described in the previous email?
>>>>>> Recently I have noted that something similar occurs on 3D
>>>>>> structures when zooming in extremely to the structure and then rotating it.
>>>>>> It appears a kind of pattern to generate the shadow of the face but as you
>>>>>> rotate the structure the face begin to get noisy.
>>>>>>
>>>>>> My current setup is VTK git development branch using OpenGL2 as
>>>>>> rendering backend. mesa 12.0.1 with AVX. I have also tried using mesa 11.2
>>>>>> and the results are the same.
>>>>>>
>>>>>> Thanks!
>>>>>> Regards
>>>>>> Patricio
>>>>>>
>>>>>> El Monday, October 3, 2016, Patricio Palma C. <patriciop at gmail.com>
>>>>>> escribió:
>>>>>>
>>>>>>> Dear Experts
>>>>>>>
>>>>>>> I'm using VTK 7.1 (latest Git version) and Mesa 12.0 with AVX. I
>>>>>>> have an application that display a 2D structure and some data on it. After
>>>>>>> zooming in a couple times in the same spot of the structure it begins to
>>>>>>> appear some noise over the 2D structure that increase after continuing
>>>>>>> zooming in.
>>>>>>>
>>>>>>> Is this a known issue? is there a way to solve/avoid this?
>>>>>>>
>>>>>>> I've attached some pictures showing how the noise appears while
>>>>>>> zooming in.
>>>>>>>
>>>>>>> [image: Inline image 2]
>>>>>>> [image: Inline image 3]
>>>>>>> [image: Inline image 5]
>>>>>>> [image: Inline image 6]
>>>>>>>
>>>>>>> --
>>>>>>> Patricio Palma Contreras
>>>>>>>
>>>>>>
>>>>>>
>>>>>> --
>>>>>> Patricio Palma Contreras
>>>>>>
>>>>>>
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>>>>>
>>>>>
>>>>> --
>>>>> Ken Martin PhD
>>>>> Chairman & CFO
>>>>> Kitware Inc.
>>>>> 28 Corporate Drive
>>>>> Clifton Park NY 12065
>>>>> 518 371 3971
>>>>>
>>>>> This communication, including all attachments, contains confidential
>>>>> and legally privileged information, and it is intended only for the use of
>>>>> the addressee. Access to this email by anyone else is unauthorized. If you
>>>>> are not the intended recipient, any disclosure, copying, distribution or
>>>>> any action taken in reliance on it is prohibited and may be unlawful. If
>>>>> you received this communication in error please notify us immediately and
>>>>> destroy the original message. Thank you.
>>>>>
>>>>
>>>>
>>>>
>>>> --
>>>> Patricio Palma Contreras
>>>>
>>>
>>>
>>>
>>> --
>>> Ken Martin PhD
>>> Chairman & CFO
>>> Kitware Inc.
>>> 28 Corporate Drive
>>> Clifton Park NY 12065
>>> 518 371 3971
>>>
>>> This communication, including all attachments, contains confidential and
>>> legally privileged information, and it is intended only for the use of the
>>> addressee. Access to this email by anyone else is unauthorized. If you are
>>> not the intended recipient, any disclosure, copying, distribution or any
>>> action taken in reliance on it is prohibited and may be unlawful. If you
>>> received this communication in error please notify us immediately and
>>> destroy the original message. Thank you.
>>>
>>
>>
>>
>> --
>> Patricio Palma Contreras
>>
>
>
>
> --
> Ken Martin PhD
> Chairman & CFO
> Kitware Inc.
> 28 Corporate Drive
> Clifton Park NY 12065
> 518 371 3971
>
> This communication, including all attachments, contains confidential and
> legally privileged information, and it is intended only for the use of the
> addressee. Access to this email by anyone else is unauthorized. If you are
> not the intended recipient, any disclosure, copying, distribution or any
> action taken in reliance on it is prohibited and may be unlawful. If you
> received this communication in error please notify us immediately and
> destroy the original message. Thank you.
>
--
Patricio Palma Contreras
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