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I have added a plane with a color-ramp as texture and added a particle system (grass) as seen below.

what I need to do is make the grass grow from the green area, not the blue area and not from faces or vertex

Is there a way to do that?

thanks.

enter image description here

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2 Answers 2

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You need to bake a copy of the node in a grayscale (where the value correspondes to the density of your grass), and use it in your particles' textures with the option to influence the density.

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  • $\begingroup$ It worked :) ..... baked the color into grayscale and used it as a texture with density influence. thanks a lot. $\endgroup$ Apr 8, 2019 at 17:59
  • $\begingroup$ where can I share the screen shoot of the final result?! $\endgroup$ Apr 8, 2019 at 18:05
  • $\begingroup$ perhaps this blender.meta.stackexchange.com/questions/194/… might help, thought there are plenty of other options $\endgroup$
    – Secrop
    Apr 8, 2019 at 18:36
  • $\begingroup$ here is the result. link $\endgroup$ Apr 8, 2019 at 19:34
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it's not possible your only options for growing are by using; vertex weights, textures, grooming(particle edit) or by simply by object.

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