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So, I just finished a procedure for mountain texture and I need to scatter trees only in places under the snow areas.
My idea was to use the same method as I did for mapping the snow in the shader editor with a texture coordinate --> separate xyz --> color ramp, but geometry nodes don't support texture coordinates.
Is there any way to add trees only in the green areas under the snow?
You have at least two different options here:
Your question refers to the variant with the image texture:
Get your terrain with Object Info.
The node Bounding Box gives you the minimum and maximum position/extension of this mesh.
With Map Range you can now map the position of the faces of this range into another one. In this case the image texture needs a range from $(0,0,0)$ to $(1,1,0)$ as input.
You can then feed the result as a vector into the Image Texture node that contains your image.
Depending on the colors of the image, you can now make comparisons which create a selection.
Based on this selection you create the points for your instances with the node Distribute Points on Faces.
At these points you can then instantiate your trees, swimming pools, or whatever with Instance on Points.
The other variant works directly with the Z-position of the terrain:
Here you simply separate the Z-position with Separate XYZ and directly compare this value with a value of your choice.
With this selection you continue as in the example above...
