[vtkusers] 回复： About the example--vtk for iOS VolumeRender

Wed Nov 18 22:57:52 EST 2015

Hello developers,

      Following your instructions, the VolumeRender can read the nrrd file, but when I run the program it came out 2 errors:

      ERROR: In /Users/dzf/Desktop/VTK/Rendering/OpenGL2/vtkOpenGLPolyDataMapper2D.cxx, line 850

vtkOpenGLPolyDataMapper2D (0x7fe288f404a0): failed after RenderOverlay 1 OpenGL errors detected

  0 : (1286) Unknown error

ERROR: In /Users/dzf/Desktop/VTK/Rendering/OpenGL2/vtkTextureObject.cxx, line 554

vtkTextureObject (0x7fe28988f530): failed at glBindTexture(0) 1 OpenGL errors detected

  0 : (1286) Unknown error

    Wait maybe 20 seconds, the app can run and the model can display but interaction has almost no reaction, especially the 3d image quality is very low, all of these are not accepted and dislike the demo vedio on the web. So  why the result is very bad and there are two errors. I did not modify the original code, some difference is I only convert the nrrd file into unsigned char type not modify the resolution as I did not know how to use 3d slicer very well.

    Thank you for your helps!

Bob
------------------ 原始邮件 ------------------
发件人: "Aashish Chaudhary";<aashish.chaudhary at kitware.com>;
发送时间: 2015年11月19日(星期四) 凌晨2:57
收件人: "Cory Quammen"<cory.quammen at kitware.com>; 
抄送: "邓卓夫"<dzfowen at qq.com>; "vtkusers"<vtkusers at vtk.org>; 
主题: Re: [vtkusers] About the example--vtk for iOS VolumeRender

You can ignore the second error that just resulted from the fact that reader failed to load the file. If you follow Cory's suggestion, hopefully it will work for you. 

Thanks,

On Wed, Nov 18, 2015 at 1:06 PM, Cory Quammen <cory.quammen at kitware.com> wrote:
The VTK Nrrd reader may not be able to read compressed NRRD files. Try to convert it to a non-compressed NRRD file by opening it in Slicer and then saving it with the compression option turned off.

- Cory

On Wed, Nov 18, 2015 at 12:03 PM, 邓卓夫 <dzfowen at qq.com> wrote:

Hi developers,

    I try to build the latest vtk for iOS example VolumeRender, compiling is ok. However when I run the project with the data file CT-chest.nrrd which is downloaded from 3D slicer web and converted into 8 unsigned char and 256*256*130 format, the Xcode came out 2 errors:

       ERROR: In /Users/dzf/Desktop/VTK/IO/Image/vtkNrrdReader.cxx, line 337

vtkNrrdReader (0x7f9e8b821370): CT-chest.nrrd is not a nrrd file.

     ERROR: In /Users/dzf/Desktop/VTK/Common/ExecutionModel/vtkExecutive.cxx, line 784

vtkCompositeDataPipeline (0x7f9e8b821e50): Algorithm vtkNrrdReader(0x7f9e8b821370) returned failure for request: vtkInformation (0x7f9e8b823530)

  Debug: Off

  Modified Time: 8501

  Reference Count: 1

  Registered Events: (none)

  Request: REQUEST_INFORMATION

  FORWARD_DIRECTION: 0

  ALGORITHM_AFTER_FORWARD: 1

1 error: why Xcode assumed that the file is not nrrd file, it is strange maybe I had mistakes to convert the original nrrd file into proper one with 3d Slicer?

2 error:I can not understand.

Thanks for your reply!

  Bob

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