Possible to make homography points 'stick'?

vvvv beta general
1

Hi there,

Im using an IOBox (value advanced) to control the homography node points of a quad in the renderer. Its quite difficult to use because when you move one point in the IOBox all of the other points move also. How can I make it so the other points dont move when one point is moved?

Thanks.

2

can you attach an example patch?

3

yes here it is. sorry its a little messy.

To explain the patch:

its for an exhibition I am creating in February.

The dmx section is to control a moving mirror. Beaming into the mirror is a projector which is ofcourse connected to vvvv also. This way I can control the mirror and the vision with vvvv.

In the gallery space I am putting some large cubes and rectangles, and set the mirror to beam onto each one by one.

Then when the mirror stops it beams some texture. This is where I have some problem!

THe best system I can create myself is just a white quad that (with this patch) will switch from one quad to the next. This way I can morph the quads so if one quad is very small and the next quad is the size of the cube, it creates a cool effect. Or if one quad is shaped against one edge of a cube and hte next quad is placed against the other edge it ‘runs’ over the cube.

I really hope to create a system that looks like it is scanning the environment.

toomuchinfo-2.v4p (41.8 kB)

4

hey kit, hey all,

please don’t post fullscreen patches.

5

this video shows the mirror and projector working together (half way through video)

http://vimeo.com/2491310

6

you are using the Homography (Transform 2d) on a render object (quad), not on the renderer’s projection transform.

for this reason you should have choosen “Original points” ranged [ -0,5000 ; 0.5000 ]( -0,5000 ; 0.5000 ) instead of [ -1 ; 1 ]( -1 ; 1 ).

i inserted a UniformScale (Transform) with Scale=“2” which does a similar effect.

btw: cleaning patches helps you understanding yourself ;)

toomuchMess.v4p (42.8 kB)

7

thanks kalle.

is it possible to also trigger a sound file to play every time a quad switches?

8

Change (Animation) ??

9

Hi there,

Im using an IOBox (value advanced) to control the homography node points of a quad in the renderer. Its quite difficult to use because when you move one point in the IOBox all of the other points move also. How can I make it so the other points dont move when one point is moved?

Thanks.

I haven’t seen the patch (I’m on my mobile) but you might want to look at the timeliner node for syncing events.
Filestream is your man for making sounds happen

10

thanks Genki

the timeliner node looks very useful for installation purposes.