» CatMapper
This site relies heavily on Javascript. You should enable it if you want the full experience. Learn more.


Credits: catweaselelliotwoods


This is a basic patch for doing 3D mapping using 3d Homography.
The idea is that you choose 4 points on your 3d model, and then match them to the real world, once done those points become fixed, and you move your projector until the perspective matches the rest of the scene. Its pretty quick to settup as long as your model is accurate.
Has a basic multiple coloured softshadows implimentation.
The model is from a very quick mapping I did a few years ago (that how long this patch has been kicking around before tidying!)

Please if you make use of this patch, please include any updates you might make into the contrbution, it would nice to have a remixed mapping patch!
I have had it working with Elliots camera calibration plugins, but they are a bit flaky execept in a specific build of vvvv that he has, hopefully that will be fixed soon...
Let me know if it works for you



12.06.13 [21:18 UTC] by catweasel | 1044 downloads
Small bug fixes
Show 1 older revisions

Older Revisions

31.05.13 [16:35 UTC] by catweasel | 578 downloads
3d Homography with Spatial Edge Blending.

Noir 31/05/2013 - 17:28

thanks for sharing

screamer 31/05/2013 - 18:55

great catweasel&eliottwood ;)
love this contribution, very nice and useful

Hadasi 12/06/2013 - 17:49

Hi Cat,

I was trying out your patch and I couldn't manage to edit the source points. Everything else seems to work as advertised, but that one area ain't. I'm trying to find the parameter to change. Phenomenal work, if a bit of a jungle ;-)


Hadasi 12/06/2013 - 17:55

Also, 'F1'... dude!

Hadasi 12/06/2013 - 19:14

There were a couple disconnections in the Control Spheres. Patch. Seems to be back in action. I can't upload the file, but try and follow the data trail from the image below.

Control Sphere Adjustment
catweasel 12/06/2013 - 21:17

@Hadasi I delete the help patch for the renderer, simple fix, it was built for a stand alone app, so f1 was allowable!
Really I'd like to have a node to disable v4 shortcuts, so you can use copy and paste, and ctl z with out issues, currently keyboard control is iffy, you can pretty much only use keys without modifiers, or use atl+ctl, which is an arse too! But feel free to alter the key mappings ;)
Thanks for the feedback, fixed the issue ( Its a multiply by 0 rather than missing links, if you hadn't used your mouse wheel to zoom, it was broken)
Also fixed shadows not working on ATI too...
Try it again and see if that fixes it for you...

anonymous user login


~6h ago

~2d ago

utah: not able to find the "Renderer "

~5d ago

NoseBleedIndustries: Please, integration with this low cost mechanical display, so beautiful! https://www.vestaboard.com/

~5d ago

NoseBleedIndustries: Please, integration with this low cost mechanical display, so beautiful! https://www.vestaboard.com/

~9d ago

joreg: @mediadog they are here: workshop-videotracking-node10

~9d ago

mediadog: Hmmm slides for node10 video tracking cannot be found: workshop-videotracking-slides

~11d ago

joreg: @mediadog thanks for the pointer, links are updated

~11d ago

mediadog: Where are the 50beta42 offline instalers? The offline installers are still linked to 41, not 42.