3D parametric plotter

This video from Benedek93 is a little slow to get going, but it’s well worth watching all the way through for a really tight demonstration of what you can achieve with OpenGL ES on the Pi. 

Benedek says:

Recently I’ve started going through a tutorial for modern OpenGL programming again (I can recommend it:http://arcsynthesis.org/gltut/ ), and on the way I decided to re-do that function plotter program I have showed off in one of my videos (“OpenGL Shaders and Shadow Maps”).

First I wrote it using the old, fixed-pipeline OpenGL specification so that I could run it on my laptop which didn’t support the newer versions. You can download it here and play with it on a PC: https://bitbucket.org/benedek/simple-…

At the same time I was also messing around with OpenGL on the Raspberry Pi and I was impressed seeing how smoothly you could make it draw simple but pretty 3D graphics. So I started porting that program to the RPi, adding the boilerplate code necessary to set up a GL context on it and changing the graphics code to use modern OpenGL ES.

In the end, the results were just as pretty as in my old shadow-mapping plotter program (except for the shadows), and the RPi was able to draw models smoothly at the same triangle counts as my laptop.

Here’s the download link: https://bitbucket.org/benedek/rpi-sim…

21 comments

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Way cool. Can’t wait to play with it tonight.

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Did compile on a raspian from February 2013.
Did not compile on a raspian from December 2012, updated, upgraded and rpi-updated.
Missing symbols:
georg@crumb ~/benedek-rpi-simple-paramplot-36f81c51893d $ g++ -o rpi-simple-paramplot main.o graphics.o evaluator.o -L/opt/vc/lib -lGLESv2 -lEGL `pkg-config –libs sdl`
main.o:main.cpp:function main: error: undefined reference to ‘bcm_host_init’
main.o:main.cpp:function main: error: undefined reference to ‘bcm_host_deinit’
graphics.o:graphics.cpp:function Graphics::init_egl_context(): error: undefined reference to ‘graphics_get_display_size’
graphics.o:graphics.cpp:function Graphics::init_egl_context(): error: undefined reference to ‘vc_dispmanx_display_open’
graphics.o:graphics.cpp:function Graphics::init_egl_context(): error: undefined reference to ‘vc_dispmanx_update_start’
graphics.o:graphics.cpp:function Graphics::init_egl_context(): error: undefined reference to ‘vc_dispmanx_element_add’
graphics.o:graphics.cpp:function Graphics::init_egl_context(): error: undefined reference to ‘vc_dispmanx_update_submit_sync’
collect2: ld returned 1 exit status

Any help is appreciated!

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Yeah, I’ve only built it on the newest version (I had an older Raspbian on an SD card which I lost apparently) and I used the minimal set of building options which made it compile for me :)

You can take a look at the demo’s Makefile in /opt/vc/src/ to get some extra g++ options.
Here’s some you could try:

-lbcm_host -lvcos [possibly: -lopenmaxil -lvchiq_arm]

If you get it running, could you please let me know which options are necessary so I can update the Makefile in the repository? Many thanks!

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Hi Benedek! If you have a website you’d like us to link to in this post, please let me know (loved your YouTube channel). And thank you very much for producing this video; it’s awesome.

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Hey, thanks very much for linking to my video! If it weren’t for this post, it would never have gotten this much attention =)

The closest thing I have to a website right now is
http://n.ethz.ch/~vartokb/
but you don’t have to link to it, I don’t use it that much.

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Adding -lbcm_host at the end did the trick.

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A truly superb demonstration of the capabilities of the Raspberry Pi!

This gives a great ‘peak’ at what the ‘big kids’ can do with the $35 wonder. Visualization would help so much in grasping advanced math concepts, every lab/classroom should have one…

Thank you for investing the time and for the excellent demonstration.

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Ok, now this is really annoying, not the video, but how it seems everyone else’s OpenGL ES is working find but mine has never worked, tried Minecraft Pi edition it worked 3 times then crashed, re-installed it and it still pulled up an error after i did an sudo apt-get update && sudo apt-get upgrade, and I re-installed OpenGL ES. Sorry if this is not the right place to vent my aggravation over this but i would like some help… (Awesome job Benedek93!)

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Oh, and i am using Occidentals from Adafruit if this helps (re-installed the image as well and nothing…)

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Have you tried using a different power supply?
You’ll be able to get more help if you ask on the Forum (see the big prominent link at the top of the page? ;-) )
See also http://elinux.org/R-Pi_Troubleshooting

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try monster speaker cables :[=]

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Impressive Video! I had No Idea RP had the ability to do this sort of Graphics Processing. Fantastic! Thank You for the demo.

Regards
Vince

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That’s really neat! Much better than the Casio graphic calculator I used during my Maths A-level :-)

I initially mis-read the title as “3D parametric printer” – funny how your brain gets so used to seeing certain phrases.

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A Casio graphic calculator! and I remember being happy with my new 12″ slide rule. It even had the sqrt(1 + x**2). They arrived in time to be handed out during a Further Maths examination.

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Always good to see that there is at least one guy present older than me!

When the time came that I learned about logarithms in school my father took me to the side and showed me his collection of slide rules.

It was like with phones and tablets: you had to trade resolution for mobility. ;-)

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Fabulous stuff.

As an aside, I see you have headers in P2, what are you using them for ?

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The lack of mounting holes indicates he’s using a Revision1.0 RasPi – these all came with headers fitted to P2 (even though it’s not usable by anybody outside Broadcom). http://elinux.org/RPi_Low-level_peripherals and http://elinux.org/RPi_Hardware contain more details.

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Nice to see the slick graphics demos coming through :)

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If you’re interested, you can also discuss this program on the forum thread I created here: http://www.raspberrypi.org/phpBB3/viewtopic.php?f=68&t=35867

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Excellent, will have a go, looks really good.

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Am very new to any form of linux so have spent the evening learning about make and apt-get and have installed sdl. However, am now getting the error that it is missing the file glm/glm.hpp. Should there be a glm subdirectory?

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