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I've spent way too many hours on this and I don't know how else to make this work. Perhaps a dozen hours went into getting the coordinates right on a group of grass, only for it to break completely when made into a particle (I thought this would not be an issue since it is generated from the "object" as you can see below). As for the original mesh, there is a special location that I have put my grass (under the ground) because I don't want to use a (useless) tilted object (seems to be the only way to get the particles to stay upright or they end up being on the side). Here's what I'm trying to do:

enter image description here

Here's what I get, though:

enter image description here

Any help is greatly appreciated. Btw, I'm trying to do this (with the translucent-like effect):

enter image description here enter image description here

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A couple problems arise from using the Object coordinates. I would use Vertex Colors:

In Weight Paint mode, use the Weight Gradient tool under Weight Tools in the T sidebar to create a weight gradient along your grass blade. Use the weight painting tools to adjust as needed:

enter image description here

Next, enable the Tissue add-on in the Add-ons panel of the user preferences:

enter image description here

Now, in Vertex Paint mode, use the Vertex Color from Vertex Group tool in the Tissue Tools panel of the T sidebar to convert the weight into a vertex group:

enter image description here

Last, use an Attribute node to get the gradient from the vertex color:

enter image description here

Result as a particle:

enter image description here

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    $\begingroup$ Awesome. Exactly what I was looking for. Lifesaver, man. I appreciate it! $\endgroup$ Commented Dec 29, 2018 at 1:27

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