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Index › Programming Questions & Help › Programs › Random noise background (perlin noise)
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Random noise background (perlin noise) (Read 1435 times)
frodo_jedi
Random noise background (perlin noise)
Oct 22nd, 2008, 7:02pm  

Hello everybody,
I have studied the example of the perlin noise
http://processing.org/learning/basics/noise3d.html
and I'd like to use it as background.

The problem is that I am not able to draw any other object
i.e. I am not able to use the example as background.

I think the cause is because every pixel is set (see
pixels[x+y*width] = color(bright,bright,bright)Wink.


Can someone suggest me how can I adapt such example
as background?

Moreover can someone suggest me another background with
similar effect?


Tanks in advance
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glenn
Re: Random noise background (perlin noise)
Reply #1 - Oct 23rd, 2008, 11:53am  
create a PGraphics as a buffer then have the noise draw to this instead, then draw this image on your mainscreen which can be a background for you to draw other things on top of.
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frodo_jedi
Re: Random noise background (perlin noise)
Reply #2 - Oct 23rd, 2008, 1:07pm  
Hi,
thank you very much for having replied.

I think I can't use the PGraphics because in my program I
import the OPENGL library. Indeed, in the on line help of
createGraphics() there is written: "It's not possible to use
createGraphics() with OPENGL, because it doesn't allow
offscreen use."


Please help!

Thanks in advance.
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frodo_jedi
Re: Random noise background (perlin noise)
Reply #3 - Oct 24th, 2008, 1:40pm  
Hello...can anyone help me please?

Thanks in advance
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st33d
Re: Random noise background (perlin noise)
Reply #4 - Oct 24th, 2008, 2:02pm  
You could use a PImage instead of a PGraphics.

http://processing.org/reference/PImage.html

That also has a pixels property you can write to. Then you can use it as a background.
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frodo_jedi
Re: Random noise background (perlin noise)
Reply #5 - Oct 24th, 2008, 2:18pm  
Yes,
but an Image is static! Am I wrong?

I want to have a dynamic background!
That is I want that beyond the objects I want to
display there is a changing background made with some random
microevent giving the impression of fog.

Do you have other suggestions?

Thanks in advance
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JohnG
Re: Random noise background (perlin noise)
Reply #6 - Oct 24th, 2008, 3:01pm  
I think things are getting far too complicated here...

What you need to do is clear the Z-buffer after drawing the perlin noise, and then you can draw over it.

I believe with the latest versions of processing, this is a simple hint() command.
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frodo_jedi
Re: Random noise background (perlin noise)
Reply #7 - Oct 25th, 2008, 4:46am  
Hi,
thanks a lot for answearing.

Why do you say that it is complicated?
Nobody has never render objects over a dynamic background?

I tried your solution it is about what I want to do...but it does not work perfectly. Maybe the reason is that the cpu of my laptop is not to much powerful...the fact is that the sphere I render over the perlin noise background does not appear very clear (as it would appear withouth the perlin noise background).

Are there other solutions?

I want to do a very simple thing: a white sphere that appear among a foggy landscape ().

Suggestion needed!

Thanks in advance.
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