Adaptive Background

vvvv beta question
1

Im trying to make an adaptive background shader.

But in the begining i see a curios thing, i dont know why but when i render with shader and loop in the queue render in the sader again it is offset in one pixel in X and in Y.

I need to make a transformation dependat of the render backbuffer to correct the error.

show you an example

BGAdaptive.rar (2.7 kB)

2

A liitle Update.

Know going to objetive there is another problem, i use a divisor make minimum adjust when the change it over threshold, i like if this number it bigger, but i loose a lot of presission because i only have an integer range between 0-256.

If i can get in memory float4x4 be great, but i dont know how JAJA

send you un update file.

You can see objects in movement make invisible, or try to this jaja

BGAdaptive.rar (2.9 kB)

3

Well im done for today
Im newbie in vvvv and this help me for practice and learn a lot of things a dont know.

Embed in code texture offset
Add new Control Parameters

Put here the last version, it works great for me, hope your feedback i upload…

BGAdaptive.rar (3.1 kB)

4

works nice, just a coding hint. the distance function returns a single float value that is the distance between the two vectors and the shader language allows to write vector calculations that work on all components of a vector very simple, the code can be reduced to:

float4 adapt(vs2ps In): COLOR
{
float4 col = tex2D(Samp, In.TexCd);
float4 col_back = tex2D(Samp2, float2 (In.TexCd.x+0.5/Width,In.TexCd.y+0.5/Heigth));
float tmp = distance(col_back, col);
float4 diff = col-col_back;

if (tmp > abs(HighThreshold))
col.rgb=col_back.rgb+(diff.rgb+LowOffset*sign(diff.rgb))/InMoveSpeed;
else
col.rgb=col_back.rgb+(diff.rgb)/StoppedSpeed;

return col;
}

5

Ty a lot for the hint, ill will update the code :)

6

i used to work with bg subtraction and lately i used a plugin by u7, here :)
It is GPU based and i’d like to make some test on patch i already know and use, can u update code and post the last version u have please ? thank u :)

7

I update the code

this line launch error, its keep as old version
if (tmp > abs(HighThreshold))

i put a TOGGLE button to get backgroung in first adjust, its a toggle because its an LFO dependat and with BANG dont work at every time.

BGAdaptive.rar (3.3 kB)

8

change tmp to a float type, not float4. like i explained, the distance function does not return a float4 type…

9

yes you are right, sorry missing that point.
The last

BGAdaptive.rar (3.2 kB)