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I've been following Blender Guru's tutorial (https://www.youtube.com/watch?v=EesfCLQD8jY) on how to create a martian landscape, but I want the rocks to scatter on just one part of the surface using a particle system. Is there a way to do this?

This is the area I'm talking about:

enter image description here

These are the particle settings (for one set of rocks)

enter image description here

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Short answer: You want to create a vertex group and put that in for particle density.

Long Answer: If you assign the particle emission to to the land you'll get something like this:enter image description here

Obviously we don't want the icospheres all over the plane, just a select portion. We can do this we two methods, weight pain or creating a vertex group. Weight pain will give you more control, but I'll show how to assign a vertex group because it's a little bit quicker.

So tab into edit mode. Hit "c" and paint the vertices you wish to be affected.enter image description here

Now invert the selection with Ctrl "i" and go to vertex groups on the right and assign a group. enter image description here Now go back to the particle system, scroll down to vertex groups and select the group. I would recommend naming the group. enter image description here

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  • $\begingroup$ Nice! That worked very well! I also tried the weight paint mode which like you said gave more flexibility $\endgroup$ – lakerice Nov 1 '17 at 16:43

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