The Resin 3D DLP printer Wanhao Duplicator 7 originally has been offered with the free slicing software Creation Workshop available for download.¹ Later on Wanhao seems to have bought the software company behind Creation Workshop and have developed new version, Wanhao D7 Workshop. The original download locations for the free software vanished. Users who have bought the printer after November 2018 were able to get a free license key. Others, who bought it before or obtained a used printer, had to buy one. Fortunately a user made the binaries of the original free opensource version available for download again at dropbox.²

Download: https://www.dropbox.com/s/ytu5yoo2ltut5a2/Creation_Workshop_D7_v1.0.075.zip?dl=0

Creation Workshop has been developed using .Net C# and can be used with Mono with Linux. Unfortunately this version of the Software does not work with mono on Linux depending on graphics hardware. There also has been a report of Creation Workshop crashing on the Raspberry Pi.^{3 45} From what I can tell it works with Intel graphics boards, but crashes with NVIDIA graphics boards. When running Creation Workshop with nvidia-drivers, it shortly opens a black window and then crashes with the console output below:

X11 Error encountered: 
  Error: BadMatch (invalid parameter attributes)
  Request:     151 (5)
  Resource ID: 0x840006E
  Serial:      1568
  Hwnd:        Hwnd, Mapped:False ClientWindow:0x840006E, WholeWindow:0x840006D, Zombie=False, Parent:[Hwnd, Mapped:True ClientWindow:0x8400064, WholeWindow:0x8400063, Zombie=False, Parent:[Hwnd, Mapped:True ClientWindow:0x8400062, WholeWindow:0x8400061, Zombie=False, Parent:[Hwnd, Mapped:True ClientWindow:0x8400060, WholeWindow:0x840005F, Zombie=False, Parent:[Hwnd, Mapped:True ClientWindow:0x840005E, WholeWindow:0x840005D, Zombie=False, Parent:[Hwnd, Mapped:True ClientWindow:0x840005C, WholeWindow:0x840005B, Zombie=False, Parent:[Hwnd, Mapped:True ClientWindow:0x840005A, WholeWindow:0x8400059, Zombie=False, Parent:[Hwnd, Mapped:True ClientWindow:0x8400058, WholeWindow:0x8400057, Zombie=False, Parent:[<null>]]]]]]]]
  Control:     UV_DLP_3D_Printer.GUI.Controls.ctlGL  at System.Environment.get_StackTrace () [0x00000] in <a6a5ba8fc13a4797a32a4dc4ae25c772>:0 
  at System.Windows.Forms.XplatUIX11.HandleError (System.IntPtr display, System.Windows.Forms.XErrorEvent& error_event) [0x00000] in <f8f55e5d29ae400f8589d196b5502445>:0 
  at OpenTK.Platform.X11.Glx.MakeCurrent (System.IntPtr , System.IntPtr , System.IntPtr ) [0x00000] in <6e87929761c543a4bfb6d5acaea62619>:0 
  at OpenTK.Platform.X11.Glx.MakeCurrent (System.IntPtr display, System.IntPtr drawable, OpenTK.ContextHandle context) [0x00000] in <6e87929761c543a4bfb6d5acaea62619>:0 
  at OpenTK.Platform.X11.X11GLContext.MakeCurrent (OpenTK.Platform.IWindowInfo window) [0x00000] in <6e87929761c543a4bfb6d5acaea62619>:0 
  at OpenTK.Graphics.GraphicsContext.MakeCurrent (OpenTK.Platform.IWindowInfo window) [0x00000] in <6e87929761c543a4bfb6d5acaea62619>:0 
  at OpenTK.GLControl.MakeCurrent () [0x00000] in <1b9440a0f8834418a8d369f909728a32>:0 
  at OpenTK.GLControl.OnHandleCreated (System.EventArgs e) [0x00000] in <1b9440a0f8834418a8d369f909728a32>:0 
  at System.Windows.Forms.Control.WmCreate (System.Windows.Forms.Message& m) [0x00000] in <f8f55e5d29ae400f8589d196b5502445>:0 
  at System.Windows.Forms.Control.WndProc (System.Windows.Forms.Message& m) [0x00000] in <f8f55e5d29ae400f8589d196b5502445>:0 
  at System.Windows.Forms.ScrollableControl.WndProc (System.Windows.Forms.Message& m) [0x00000] in <f8f55e5d29ae400f8589d196b5502445>:0 
  ... 

From the output there seems to be a problem with OpenTK.Graphics, which turns out to be an incompatibility of the bundled version of the OpenTK .Net wrappers libraries bundled with this version of Creation Workshop. To fix this problem one can download newer versions of the wrapper dlls, which work together with nvidia-drivers, from nuget.org.

Downloads can be found here: opentk.2.0.0.nupkg and here: opentk.glcontrol.3.1.0.nupk.

After downloading, the dlls can be extracted from the nupk files using unzip. Then replace the the files OpenTK.dll and OpenTK.GLControl.dll in the Creation Workshop directory with the newer ones from the nuget packages.

Afterwards Creation Workshop can simply be started from the terminal:

mithrandir@galadriel ~/Creation_Workshop_D7_v1.0.075 $ mono CreationWorkshop.exe

This way Creation Workshop has been run on Gentoo Linux on X86_64 architecture and on a NVIDIA Jetsons TX2 board with ARM64 architecture. Other platforms like the Raspberry, reported to be problematic, might work as well.

Jürgen

1. theoddartisan.com: wanhao-duplicator-7-d7-v1-5-setup-tutorial/
2. google groups: D7 Plus – Some setup information
3. buildyourownsla.com : Creation Workshop on Linux
4. buildyourownsla.com: CW does not work on Linux
5. buildyourownsla.com: Problem launching CW on Ubuntu Linux 14.10

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In the article Flightgear with quad buffered stereo I have written about how to get quad buffered stereo to work with the famous flight simulator FlightGear. Recently FlightGear-2.8.0 has been released. The problem with quad buffered stereo still persists with FlightGear-2.8.0 .

One expects to enable stereoscopic mode in FlightGear starting it with the following line:

export OSG_STEREO_MODE=QUAD_BUFFER;export OSG_STEREO=ON; fgfs

When starting flightgear this way, one gets the following console output and no stereoscopic view:

Warning: detected OpenGL error ‘invalid operation’ after RenderBin::draw(,)

Getting FlightGear to work with quad-buffered stereo

The reason for the above error message and the resulting broken stereo mode is, that the stereo context does not get initialized properly. The details are described here: Flightgear with quad buffered stereo. Unfortunately the patch I proposed in the mentioned post does not work for flightgear-2.8.0. However, the good news is, it only required a slight modification, the WindowBuilder.cxx file no longer is in src/Main, but in the src/Viewer directory. You can download the new patch from here:  flightgear-2.8.0-stereoscopic.patch (2582 downloads )

Hopefully the patch finds its way into the next flightgear release.

As usual for quad buffered stereo, you have to use a professional graphics board that supports quad buffered stereo, like a NVIDIA Quadro FX or a Ati FireGL and proper display hardware, like shutter glasses, a HMD or a stereoscopic projection system, to benefit from it. To use the quad buffered stereo mode start flightgear with the environment variables mentioned above. Afterwards you probably have to enable quad buffered stereo mode by selecting the Stereoscopic View Options Item in the the View menu.

The Gentoo way

For gentoo users I have created an overlay. Like the previous one it contains patches and modified ebuilds for flightgear with working quad buffer support. You may get the overlay from here:  flightgear-2.8.0 overlay (2596 downloads ) Download the overlay and extract it in /usr/local/portage. Be sure to include the following line in your /etc/make.conf:

PORTDIR_OVERLAY=”/usr/local/portage”

Then emerge flightgear and enjoy it in three dimensions.

Have fun

Jürgen

(1 votes, average: 5.00 out of 5)

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About one year ago I wrote about the OpenGL/GLSL debugger glsldevil in the article gentoo ebuild for glsldevil-1.1.5 and provided a gentoo ebuild for it. Unfortunately glsldevil seems not to be available anymore from the web page of the University of Stuttgart (http://cumbia.informatik.uni-stuttgart.de/glsldevil/), which has rendered the ebuild useless.

Edit 29/5/2012: The original download site of the University of Stuttgart is available again.

Since the license of glsldevil  permits redistribution, I decided to upload my local copy, to make glsldevil available for the public again. Unfortunately this only includes the Linux binaries (32bit and 64bit) and neither Windows binaries or the source code.

You can download the Linux binaries from here: [download#87]

For use with the ebuild, just copy the file to /usr/portage/distfiles/.

regards
Jürgen

(2 votes, average: 5.00 out of 5)

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Using nvidia linux drivers from version 270.X to 275.X with some graphics boards, in example the Quadro FX 350M which is built into the Dell Precision M65 notebook,  resulted in a black screen or window for OpenGL applications. Even glxgears did only output a black window. The problem has been discussed on forums.opensuse.org. A downgrade to a lower driver version, in example the version 260.X drivers is not applicable anymore, since these drivers do dot build against a recent linux-3 kernel. A upgrade to newer drivers also was not possible, since driver versions from 285.X to 295.10 did not work at all for this graphics board. Recently version 295.17 of nvidias beta driver has become available, which solves this issue. Download links are available on nvnews.net.

For gentoo users I have modified the nvidia-drivers  ebuild for the 295.17 driver. You can download my modified overlay, [download#83] and extract it in /usr/local/portage. Be sure to include the following line in your /etc/make.conf:

PORTDIR_OVERLAY=”/usr/local/portage”

Afterwards you may emerge nvdidia-drivers-295.17.

Jürgen

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In the post Flightgear with quad buffered stereo I have written about how to get quad buffered stereo to work with the famous flight simulator FlightGear.  Recently FlightGear-2.4.0 has been released. The problem with quad buffered stereo still persists with FlightGear-2.4.0 .

One expects to enable stereoscopic mode in FlightGear starting it with the following line:

export OSG_STEREO_MODE=QUAD_BUFFER;export OSG_STEREO=ON; fgfs

When starting flightgear this way, one gets the following console output and no stereoscopic view:

Warning: detected OpenGL error ‘invalid operation’ after RenderBin::draw(,)

Getting FlightGear to work with quad-buffered stereo

The reason for the above error message and the resulting broken stereo mode is, that the stereo context does not get initialized properly.  The details are described here: Flightgear with quad buffered stereo. However, the  good news is, that the patch I proposed in the mentioned post, still works with FlightGear-2.4.0. You can download the patch from here: [download#43]

As usual for quad buffered stereo, you have to use a professional graphics board that supports quad buffered stereo, like a NVIDIA Quadro FX or a Ati FireGL and proper display hardware, like shutter glasses, a HMD or a stereoscopic projection system, to benefit from it. To use the quad buffered stereo mode start flightgear with the environment variables mentioned above. Afterwards you probably have to enable quad buffered stereo mode by selecting the Stereoscopic View Options Item in the the View menu.

With the previous version, when using the quad buffered stereo mode in flightgear, there occurred some graphics errors. Some cockpit controls and other scene details contained yellow lines, like a wireframe, which were not there when starting FlightGear in “normal” display mode. These problems seem to be gone with Flightgear-2.4.0. At least I did not notice them  anymore.

The Gentoo way

For gentoo users I have created an overlay. Like the previous one it contains patches and modified ebuilds for flightgear with working quad buffer support.  You may get the overlay from here: [download#72] Download the overlay and extract it in /usr/local/portage. Be sure to include the following line in your /etc/make.conf:

PORTDIR_OVERLAY=”/usr/local/portage”

Then emerge flightgear and enjoy it in three dimensions.

Have fun

Jürgen

(1 votes, average: 5.00 out of 5)

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MPO stereo images, that were taken in example using Fujifilm FinePix Real 3D Cameras contain a field parallax in their exif data. The parallax value can be used by stereoscopic viewers like my stereoscopic image viewer SIV to adjust the 3D effect. By manipulating this value one can can customize the strength of the pop out effect and reduce the ghosting effect. This may lead to a more pleasuring viewing experience.

The parallax value can easily be displayed using exiftool:

exiftool -ee -Parallax DSCF0045.MPO

If you want to set the parallax value of an image, this is not that easy, since the value is stored in the exif data of the second embedded jpeg file in the MPO, which is not directly writable with exiftool. However one can find out the beginning of the second file with exiftool, extract the image and then set the parallax value. Afterwards on can put all together again using dd. Doing this manually is a quite awful task, so I wrote a little script for automating it:

#!/bin/bash
#setparallax.sh
#$1: MPO File $2: Parallax value

MPSTART=`exiftool -b -MPImageStart $1`
echo Multipart Image 2 begins at: $MPSTART
let MPSTART=$MPSTART/64
cp -a $1 $1.orig
exiftool $1.orig -mpimage2 -b | exiftool  -b -Parallax=$2 – \
| dd conv=notrunc bs=64 seek=$MPSTART of=$1

Use it at the command line as follows:

setparallax.sh [MPO-File] [new parallax value]

in example:

setparallax.sh DSCF0045.MPO 1.25

For determining the value that matches the visual requirements of your image you may use the parallax adjustment function of SIV (+/- key) and use the value on the OSD and printed out in the console. Perhaps some day I will add the functionality, to directly write the new parallax value to the MPO file, to SIV. However the setparallax script at least gives us the possibility to write the parallax value until then.

Jürgen

(1 votes, average: 5.00 out of 5)

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Posted in 3d, graphics, linux, tools | 3 Comments »

The current OpenSceneGraph ebuild in the Gentoo Portage tree does not install the OpenSceneGraph sample data set.  These  files include some sample models, fonts, bitmaps etc. used in the OpenSceneGraph examples and other applications.  This is a problem for applications relying on the files to be available. In example my stereoscopic image viewer SIV relies on having the OpenSceneGraph sample dataset installed and fails to load the arial font from the dataset with the following error:

Warning: font file “fonts/arial.ttf” not found.

Here is my modified ebuild resolving this issue: [download#63]

Download the modified ebuild and extract the archive into /usr/local/portage. Be sure to include the following line in your /etc/make.conf:

PORTDIR_OVERLAY=”/usr/local/portage”

If you want to use OpenSceneGraph with ffmpeg support, download the patch from bugs.gentoo.org and copy it to /etc/portage/patches/dev-games/openscenegraph-2.8.3/ as described there, to compile with ffmpeg-0.6. Otherwise the emerge will fail with:

/osgPlugins/ffmpeg/FFmpegAudioStream.hpp:18:9:
error: cannot allocate an object of abstract type
‘osgFFmpeg::FFmpegAudioStream’

Now you can set the examples USE-Flag and emerge openscenegraph to get the example dataset.

If you have got flightgear installed, reinstall simgear afterwards,  like the ebuild requests you to do:

emerge -1 dev-games/simgear

Depending on if you were upgrading or just reinstalling with the new ebuild it may be necessary to run revdep-rebuild to resolve issues with broken libraries. Hopefully the next ebuild in the portage tree will  include the sample data set.

Wxwidgets support seems to be broken with the current version. When using the wxwidgets USE-Flag Openscenegraph fails to compile with, so include

=dev-games/openscenegraph-3.0.1 -wxwidgets

in your /etc/portage/package.use if you have enabled wxwidgets in your make.conf.

best regards

Jürgen

(1 votes, average: 5.00 out of 5)

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