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Ralf Mimoun
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 Posted: Fri May 18, 2007 12:20 am Post subject: Simulating different sketch tools |
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Hi all,
I want to paint some boxes etc, but with styles that simulate a ballpen, a
pencil, chalk or a text marker. With rough edges and different color / alpha
depths. Does anyone has an idea where I can find some algorithms? They don't
have to be perfect, just something that looks ok.
Ralf |
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David Ninnes
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| Posted: Fri May 18, 2007 3:09 am Post subject: Re: Simulating different sketch tools |
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Ralf Mimoun wrote:
| Quote: | Hi all,
I want to paint some boxes etc, but with styles that simulate a ballpen,
a pencil, chalk or a text marker. With rough edges and different color /
alpha depths. Does anyone has an idea where I can find some algorithms?
They don't have to be perfect, just something that looks ok.
Ralf
|
The GIMP has brushes that do this there's a paper here
http://www.levien.com/gimp/brush-arch.html
search for 'drawing with different pens and brushes siggraph' on google
this gave a number of references
'non photorealistic rendering' is another search term, there are a stack
of articles on this in siggraph.
In general there are two things you'd want to simulate the paper you're
writing on and the drawing stick (pen, brush etc).
To simulate paper texture, bumpmapping is a good way to go. For the
brushes use a sub sampled bitmap and draw it along the paths you choose.
This is one of the definitive papers
http://mrl.nyu.edu/publications/painterly98/
there is another earlier one I can't seem to find at the moment I'll try
and dig it up, it's a siggraph one to.
hth,
Dave |
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David Ninnes
Guest
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| Posted: Fri May 18, 2007 8:11 am Post subject: Re: Simulating different sketch tools |
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David Ninnes wrote:
| Quote: | Ralf Mimoun wrote:
Hi all,
I want to paint some boxes etc, but with styles that simulate a
ballpen, a pencil, chalk or a text marker. With rough edges and
different color / alpha depths. Does anyone has an idea where I can
find some algorithms? They don't have to be perfect, just something
that looks ok.
Ralf
The GIMP has brushes that do this there's a paper here
http://www.levien.com/gimp/brush-arch.html
search for 'drawing with different pens and brushes siggraph' on google
this gave a number of references
'non photorealistic rendering' is another search term, there are a stack
of articles on this in siggraph.
In general there are two things you'd want to simulate the paper you're
writing on and the drawing stick (pen, brush etc).
To simulate paper texture, bumpmapping is a good way to go. For the
brushes use a sub sampled bitmap and draw it along the paths you choose.
This is one of the definitive papers
http://mrl.nyu.edu/publications/painterly98/
there is another earlier one I can't seem to find at the moment I'll try
and dig it up, it's a siggraph one to.
hth,
Dave
|
Found the one I was looking for but I'm not sure if it's exactly what
you're after, but it should be adaptable to geometric shapes.
http://cs.brown.edu/~jfh/papers/Salisbury-OTF-1997/paper.pdf
hth,
Dave |
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