Toni Sokura

I'm building a video projector with an Arduino accelerometer that should be able do perspective warping while rotating.

I figured out how to output X, Y, Z rotation data as degrees to Max, and the video is being rotated as I move the arduino unit.

My problem is that I'd like to be able to set "a new xyz 0.0.0." for the projector, from which the rotation would be calculated.

I.e. Point the projector straight to a wall, push button, keystone is calibrated.

In the patch attached it works one axis at a time. For example, if I enter 40 as the IMU X rotation angle, and -40 as the jit.gl.handle X rotation value, the image is straight. But it doesn't work on all 3 axes.

I can't really say I fully understand what happens in the patch, so I'd also be grateful to hear where my thinking is wrong. (Thank you Luke for help so far!)

Should I approach this problem from an entirely different angle?

I could also make this work as an Arduino push button, where the serial data to Max would just be the change from last button push, but the code on that side is already pretty complex for me. So seeing where Max takes me first..

Hi,
I'm building a video projector with an Arduino accelerometer that should be able do perspective warping while rotating.

I figured out how to output X, Y, Z rotation data as degrees to Max, and the video is being rotated as I move the arduino unit.
My problem is that I'd like to be able to set "a new xyz 0.0.0." for the projector, from which the rotation would be calculated.
I.e. Point the projector straight to a wall, push button, keystone is calibrated.

In the patch attached it works one axis at a time. For example, if I enter 40 as the IMU X rotation angle, and -40 as the jit.gl.handle X rotation value, the image is straight. But it doesn't work on all 3 axes.
I can't really say I fully understand what happens in the patch, so I'd also be grateful to hear where my thinking is wrong. (Thank you Luke for help so far!)
Should I approach this problem from an entirely different angle?

setting-new-default-coordinates-for-jit-gl-videoplane

May be you could use "pak 0. 0. 0." instead of "pack 0. 0. 0." . the "pak" output the entire list whenever input is received in any inlet .

The problem persists though. The videoplane and jit.gl.handle rotations don't cancel each other when one than one axis is rotated.

Cheers! Makes sense.
The problem persists though. The videoplane and jit.gl.handle rotations don't cancel each other when one than one axis is rotated.


Isn't it just simply adding your calibration xyz to the current xyz ?

eg. You point the beamer somewhere, get the xyz values by just sending them to a message box (right inlet) when a button is pushed, now just bang that message box and add the values to the current xyz co-ordinates.

Isn't it just simply adding your calibration xyz to the current xyz ?
eg. You point the beamer somewhere, get the xyz values by just sending them to a message box (right inlet) when a button is pushed, now just bang that message box and add the values to the current xyz co-ordinates.


Now I can just attach an accelerometer to a video projector and have push-button image correction in 3 axes.

Setting "new default coordinates" for jit.gl.videoplane