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Texture Maps or Paint?

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Glenn Moore
Texture Maps or Paint?
on Jul 6, 2007 at 2:52:51 pm

I know this is probably a very basic question so I'm probably not as good at this as I think I am :-).....but....when I create a nature scene (say a dirt road (or cart trail) in the middle of a meadow), I can't get a natural look to the difference between the dirt road and the grass. It's very sharp and distict. That's fine in a city scene but in nature, there is spill over and disorder. It's not so neat and linear. IS this more a 'painting' issue than a mapping problem? I've seen some really nice scenes that look very natural.

Thanks,

Glenn


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mYthprod
Re: Texture Maps or Paint?
on Jul 6, 2007 at 10:00:39 pm

Yeah, there are many ways to deal with this and paint is one of them. I most commonly do some sort of spill-over from the grass to the trail to hide the edges. You can bend down the edges in random places to make it look more natural and less computational. You can paint a texture over the surface or put some geometry over it, such as gravel or something. If it's a trail you might also put some blades of grass scattered throughout the middle along with some mud grooves or something to make it seem more real. A dead give-away that something is 3D is if it's too clean and perfect. Make it imperfect and it will seem more real.



- MythProd
(John David Hutton)
_________________________________________
Digital Effects Artist, Support Technician
Kansas City, Kansas - United States
_________________________________________


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Glenn Moore
Re: Texture Maps or Paint?
on Jul 7, 2007 at 3:34:22 am

Yes. That's exactly the problem. I'll try that to see how it looks. I've seen some scenes that look amazing. No harsh transitions at all.

Thanks


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Steve Sayer
Re: Texture Maps or Paint?
on Jul 9, 2007 at 1:29:43 am

Have you experimented with Paint Effects at all? They are great for details like this.

-Steve


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Glenn Moore
Re: Texture Maps or Paint?
on Jul 9, 2007 at 4:52:04 am

Yes, Steve. I just don't see how I can make it work unless I use plants (grass). I tried an experiment with the texture maps in Photoshop using the clone tool to paint in some rough edges. Still looks exactly what it is - 2 texture maps. What would you suggest within the Paint Tools? I'll try anything. I know it's do-able because I've seen it. I just assumed that it was done by an artist (which I guess it was) but I just can't do it.


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Steve Sayer
Re: Texture Maps or Paint?
on Jul 9, 2007 at 5:24:16 pm

If you apply a dirt texture to the ground, and then paint over it with Paint Effects grass, you can certainly achieve the look of grass growing along the edge of a dirt path. You can also insert a few clumps here and there on the path, and increase the density of the grass as you get further from the path, until the ground is completely hidden. Beyond that transitional zone, you'd probably want to fake the grass if possible, rather than use a lot of dense paint effects to keep it thick. But it really depends on the needs of the scene. Do you have any tests or reference images you could upload?

-Steve


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Glenn Moore
Re: Texture Maps or Paint?
on Jul 10, 2007 at 2:57:45 am

I'll create one Steve and upload it tonight. You'll see where I get stuck. Thanks

Glenn


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Glenn Moore
Re: Texture Maps or Paint?
on Jul 10, 2007 at 4:15:10 am

This is a simple scene like the one I'm having difficulty with. It ain't pretty but it gets the point across.


[URL=http://img393.imageshack.us/my.php?image=fieldandtrackon1.jpg][IMG]http://img393.imageshack.us/img393/6048/fieldandtrackon1.th.jpg[/IMG][/URL]


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Glenn Moore
Re: Texture Maps or Paint? bad link
on Jul 10, 2007 at 4:17:07 am

[URL=http://imageshack.us][IMG]http://img393.imageshack.us/img393/6048/fieldandtrackon1.jpg[/IMG][/URL]
By [URL=http://profile.imageshack.us/user/rtg497]rtg497[/URL] at 2007-07-09


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Glenn Moore
Re: Texture Maps or Paint? ........... Working Link
on Jul 10, 2007 at 4:19:38 am

OK...sorry for the spam. This link works:

http://img393.imageshack.us/img393/6048/fieldandtrackon1.jpg


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Steve Sayer
Re: Texture Maps or Paint? ........... Working Link
on Jul 10, 2007 at 4:33:12 am

Hello again, Glenn.

I see what you mean, but how are you currently mixing those two textures together? It looks like a pretty razor-sharp transition.

You can always ease transitions by adding some noise to whatever image or texture you're using to control the blend. For example, let's say you were using a black-and-white ramp to control the blend between two materials. A simple ramp would produce perfectly straight edges like this. But every ramp texture has a 'noise' slider that will add perturbations to the pattern; this will make the border between path and grass slightly uneven and unpredictable.

Another strategy might be to actually have three textures, one a 'transitional' one with maybe some sand and pebbles and so on. Again, using some noise to perturb a blending channel will help get away from that 'too perfect' look.

Hope that helps; good luck.

-Steve


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Glenn Moore
Re: Texture Maps or Paint? ........... Working Link
on Jul 10, 2007 at 6:16:59 pm

I think that's my problem. I'll try the Noise and the 3rd texture approach.


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mYthprod
Re: Texture Maps or Paint?
on Jul 9, 2007 at 8:57:50 pm

Hey, Glenn. I was poking around on highend3d for something else and thought of you. Several good paint brushes with grass, pebbles, wheat, etc. you could use to mask your edges.

http://www.highend3d.com/maya/downloads/paint_fx_brushes/



- MythProd
(John David Hutton)
_________________________________________
Digital Effects Artist, Support Technician
Kansas City, Kansas - United States
_________________________________________


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Glenn Moore
Re: Texture Maps or Paint?
on Jul 10, 2007 at 2:54:12 am

That's good stuff..similar to what's in Maya. I'll try it out too. Thanks

G


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