Forums > Jitter

CameraToPhysic2d

April 2, 2012 | 8:39 am

Hi,
Here a cool patch for making 2d detection with physics objects….

Attachments:
  1. CameraToPhys2d.zip

April 2, 2012 | 9:18 am

thx for sharing.


April 2, 2012 | 11:13 am

great!
"phys2d" and "phys2dworld" I know it from somewhere :)
anyway thanks for sharing!


April 2, 2012 | 7:50 pm

so much fun!


May 13, 2012 | 11:02 am

Thanks! This is great! Just a question, any idea why is reacting good with the poly objects but not at all with phys.mult? Also, i had problem since i enable the worldbox (couse i need it active)…


May 13, 2012 | 12:34 pm

hi,
here with phys.multiple and worldbox on …

– Pasted Max Patch, click to expand. –

May 13, 2012 | 1:30 pm

Thanks a lot! Is there a limitation of size for multiple objects? like 0.5 in your patch? Because as soon as i change the scale from 0.5 to small cubes (for exemple 0.3) it stop reacting. Can it be they become too small for the phys to recognize them and collide? (sorry my english)


May 13, 2012 | 9:26 pm

here an another example with random scale…

– Pasted Max Patch, click to expand. –

May 15, 2012 | 10:12 am

Thanks a lot, now everything is getting much more clear to understand! :)


September 2, 2012 | 5:35 pm

Thanks for this wonderful example. Recently i looked for the first time into the new physics objects, and your patch is a great help. Just a few questions if you don’t mind:

- if my camera input is 16:9 instead of 4:3, do i just have to rescale the videoplane to 17.777 10 instead 13.4 10 + the jit.phys.body to 1.77 1. 1. instead 1.33 1 1 ?

- why are the dimensions of the float matrix 100 100?

- if i change the jit.expr *10 and the scale-arguments for position in the poly accordingly, i can modify the width / height of the "collision area" ?


September 3, 2012 | 4:27 am

and one additional question:
if i want a sound played with each new collision contact with the video matrix and use the @collisions 1 feature of jit.phys.world as in the jitter-examples phys.picker.impulse.maxpat file, i still get contact detections / sound with the videomatrix even if i put the tresh to 1.

Why is that?

Attachments:
  1. cam2sound.zip

September 11, 2012 | 10:35 am

hi tobiasros
if your camera is 16:9 you simply adjust the scale of the mesh and videoplane.
the 100*100 matrix was just for testing….
to follow the format we could set the mesh matrix to the good ratio (100*75 for 4:3….)
-yes if you change the jit.expr * you can change the "collisions area", but you can set "jit.expr @expr snorm[0] in[0] snorm[1]" too, and only use scale message to mesh for that.

For the sound collisions may be the z scale of falling bodies needs to be decreased…

hope it can help


Viewing 12 posts - 1 through 12 (of 12 total)