Texture paint with decay

vvvv beta general
#1

Hi,

The current project I’m working on requires that a person in front of a camera can “paint” on a texture, don’t know how to describe it properly (see included patch). I patched something that kinda works, but I was wondering if there is some more efficientway to do something like that, maybe with shaders?

thx

abomb

Texture Decay.v4p (20.1 kB)

#2

have a look at this patch:
http://vvvv.org/tiki-download_file.php?fileId=1682

#3

hm, I probably should have been clearer what I need ;)
that motionblur patch works really nice, but I would need something where the moving “white painter thing” is not always 100% white, but gets whiter the longer you move it over the same spot (in my patch just toggle the reverse of the lfo a few times to see what I mean)

#4

i’d say you can use the motionblur, but draw the stuff in add mode and chage the brightness of the objects, have a look at the Blend (EX9.RenderState) .

#5

hm, I just can’t get it to work the way I want, I guess I’m still too noobish with all that directx renderstate etc stuff :(
Maybe you could patch something up an post it here, if it isn’t too much trouble?

#6

something in this way

draw.v4p (16.8 kB)

#7

thanx for your effort ggml. but in your patch the drawn white areas never fade away.
Again I tried many things with your patch, even a shader, but it never works the way I want it to. oddly, when using the shader (and also the second part of the motionblur patch from tonfilms link) I get the white stuff to decay, but it moves slowly to the right bottom corner of the renderer.

#8

fade away as with queue ?

draw (2).v4p (12.9 kB)

#9

kind of like that, but more “smooth”. just hava a look at the patch I postet when starting this thread, that is the effect I need. thanks again for your help =)

#10

Than perhaps use a Blurr Shader to smooth things out a bit?

Cool patch ggml :) Better than my photoshop plugin ;)

#11

Maybe this will work?
Do note you need more than 8bit in depth for it to fully fade to black. Or else it will be stuck at dark gray.
the / nodes are used to position the texture so it don’t “drift” away due to mismatch between frame coordinates and texture coordinates.
You might want to clear the screen with a black quad when changing size or opening the patch so it don’t leave artifacts.

Paint.v4p (8.5 kB)