[vtkusers] Drawing custom image with depth buffer and a translucent plane

[Ken Martin]

Maybe from vtkRenderer.h

/**
   * This flag is on and the GPU supports it, depth-peel volumes along with
   * the translucent geometry. Only supported on OpenGL2 with dual-depth
   * peeling. Default is false.
   */
  vtkSetMacro(UseDepthPeelingForVolumes, bool)
  vtkGetMacro(UseDepthPeelingForVolumes, bool)
  vtkBooleanMacro(UseDepthPeelingForVolumes, bool)




On Tue, Oct 23, 2018 at 1:32 PM, Elvis Stansvik <
elvis.stansvik at orexplore.com> wrote:

> I believe this is a limitation of VTK. Translucent polygonal geometry with
> opacity != 1.0 can't be rendered intersected with a volume other than in a
> back-to-front or front-to-back manner.
>
> Someone correct me if I'm wrong (we'd also very much like to be able to do
> this).
>
> Elvis
>
> Den fre 12 okt. 2018 kl 22:20 skrev Pato Sandana <
> patricio.sandana at synopsys.com>:
>
>> Hi Everyone,
>>
>>
>>
>> I’m trying to draw a vtkVolume and a vtkPlaneWidget both intersecting and
>> the vtkPlaneWidget is translucent. I cannot achieve that, either the plane
>> is totally behind or front.
>>
>>
>>
>> For a vtkActor with the same box extent this works.
>>
>>
>>
>> I tried to get the z-buffer from the context using
>> vtkRenderer::GetZbufferData() method, but I only get 1s. (Is this correct?)
>>
>> I also tried to write the z-buffer data I got with
>> vtkRenderer::SetZbuferData() method, but the plane is still behind.
>>
>>
>>
>> Any hints how to achieve this? Thanks in advance.
>>
>>
>>
>> Regards,
>>
>>
>>
>> *Pato Sandaña*
>>
>> TCAD Senior R&D Engineer
>>
>> Synopsys Inc. – Santiago, Chile
>>
>> [image:
>> https://spp/pic/corporate/Lists/Signatures%20Database/Attachments/164/CS12924_AutomotiveEmailSignature_2.jpg]
>>
>>
>>
>>
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-- 
Ken Martin PhD
Distinguished Engineer
Kitware Inc.
101 East Weaver Street
Carrboro, North Carolina
27510 USA

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