Paint on top of each color

vvvv beta general
1

hi guys , i was trying to help a friend with his project but we could not get the way to do it .

the aim is to draw everytime the color change , on top of the last color , the shape will be taken from a fabric sheet and as you move your hands you draw the shape , the problem is that the color is adding to last color so it alwyas become white , how could this be achived ?

the little video is taking from it

paint on top of each color.zip (84.5 kB)

2

you shoulda have checka da depthbuffa.

but thats not all. check this approach, perhaps you get closer.

paint on top of each color.zip (88.2 kB)

3

hi kalle thanks for your aproach , i was using depthbuffer in other testing patch ,still no way to do that , i tried this 2 ways but i think may be this is not the way to go for this task , as the goal is to paint on top when color change or in other words when the fabric is touched again , always keeping the last draw backwards ,
any ideas ?

paint on top of each color.zip (176.4 kB)

4

a simulation pic , is this posible ?

paint_on_top.jpg (41.5 kB)