painted shader vs populations

[phiex]

The problem with painted shaders.
For example, I want to do a sand path on grassy area.
So I draw a path with painted shader, then add grass population and then set painted shader as a invert density shader of a grass.
It seems to be ok.
But why there are instances within the path? (You can see in the picture, what I mean)
It's a problem with some "accuracy" of painted shader?
How to make painted shader act more strictly?

I apologize for flooding this forum with my questions.

phiex

[N810]

You might have to tweak the density of your paint brush,
the default seting has rather soft edges and sometimes
will miss spots that you thought you covered.

[Henry Blewer]

Often this is desirable. N810 is right. You can also adjust the edge hardness. Think of it as an airbrush.

[phiex]

thanks, I'll try

[bobbystahr]

A bit of a late reply but if you use a Distribution shader first then Assign the paint shader through that you can, in the Distribution shader, tweak the the Fuzzy Zone Softness in the Tweak tab. Set to 0 it will allow no bleed into the path.. ...

[TheBlackHole]

IMO you'd need some within the path for a more natural effect. The sand would look like it spilled out of the path and around the grass. That or the grass grew through the sand.

[bobbystahr]

There is in fact the rub....a path is man made and not at all natural. I weed mine meticuliously...a bit OC I guess, so maybe this is what phiex wants. In anycase it was an oportune opening to mention an adjustment that I've found quite handy in matching up positive and negative maps or textures. Currently I have it on my mind as I'm desigining an herbal maze and I need the sharp seperations to make it.

[Oshyan]

You could probably also use a Color Adjust Shader after the Painted Shader to increase the contrast of the mask output, and thus how strict the populations follow it when used as a Blend Shader.

- Oshyan

[Henry Blewer]

I'll have to try this Oshyan. Nice tip!

[TheBlackHole]

a path is man made and not at all natural.

I know that. By "natural" I meant real. The sand's not concrete, and sooner or later a plant will grow up through the sand. The sand will also get knocked off the path if it's used or it rains pretty hard.