I compiled the crater field generator code by PM 2Ring with a few
modifications:

New functionality:

1) If desired, large craters can now have a central peak.

2) You can specify erosion - the program will average the pixels the
specified
number of times to simulate eroded craters.

3) Output is to .bmp instead of PGM.  Unfortunately, in this current version
it's a 24-bit file with only 8 bits of info, so an 8000 x 8000 crater field
produces an output file somewhere around 187 MB.  But you can always
convert to .png after you make the .bmp output file.  Maybe I'll eventually
re-write this to produce 16-bit output (.pgm, .tga, or .png).

Also, maybe I'll create an option to import an existing hightfield.  That
would allow you to use a pregenerated landscape and then subject it to a
meteor storm.  Thoughts?

I ran this image 1200 x 1200 pixels, for 1 million craters.  Largest craters
have a radius of 120 pixels, with all craters larger than 100 pixels having
a central peak.

Mike

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Attachments:
Download 'mars_craters.jpg' (73 KB)

Preview of image 'mars_craters.jpg'

Here's the heightfield (a scaled down and compressed version).

Mike

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Attachments:
Download 'craters.jpg' (43 KB)

Preview of image 'craters.jpg'

"Mike Sobers" <sob### [at] mindspringcom> wrote:
> I compiled the crater field generator code by PM 2Ring with a few
> modifications:
>

Hmm....  Did your program make this image?  (Originally 4000x4000-16bit)

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Attachments:
Download 'crater-quartersize.png' (252 KB)

Preview of image 'crater-quartersize.png'

Why does it look like the craters are reversed?

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Your screen is upside down.
I think it looks good, maybe could do with a little higher crater walls
though, and maybe a little less craters.

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RusHHouR wrote:
> Your screen is upside down.

   Reversed as in inverted: The crater walls look like they are going
down into the ground, and the plateaus look like hills.

   No matter how long and how I look at the image, I can't see the
crater walls going up.

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Warp nous apporta ses lumieres en ce 15/07/2006 04:53:
>   Why does it look like the craters are reversed?
The light is comming from the BOTTOM left.

-- 
Alain
-------------------------------------------------
Christian Science #2: Shit happening is all in your mind.

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Alain wrote:
> Warp nous apporta ses lumieres en ce 15/07/2006 04:53:
>>   Why does it look like the craters are reversed?
> The light is comming from the BOTTOM left.

   No matter how long I look at it, I see bubbles, not craters.

   Perhaps one problem is that the crater walls don't cast shadows.

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Warp nous apporta ses lumieres en ce 15/07/2006 14:20:
> Alain wrote:
>> Warp nous apporta ses lumieres en ce 15/07/2006 04:53:
>> The light is comming from the BOTTOM left.
> 
>   No matter how long I look at it, I see bubbles, not craters.
> 
>   Perhaps one problem is that the crater walls don't cast shadows.
They do cast slight shadows, toward the TOP and a little to the right, and ONLY on the
ground 
outside of the craters. Those shadows are what make you see them as inverted.

-- 
Alain
-------------------------------------------------
Gossip is when you hear something you like about someone you don't.

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"EagleSun" <nomail@nomail> wrote:
> "Mike Sobers" <sob### [at] mindspringcom> wrote:
> > I compiled the crater field generator code by PM 2Ring with a few
> > modifications:
> >
>
> Hmm....  Did your program make this image?  (Originally 4000x4000-16bit)

Probably, but it's not my program.  I only modified it to add some more
details.  And it only puts out 8-bit (for now).

Mike

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