Hi there, this is something that’s always puzzled me, so I thought I’d pick your brains and see how you deal with it…
If I want to make a plane which extends right the way to the horizon, how do I do it?
It’s not that there is a technique to build infinite size plane to represent the horizon. People use all kinds of technique to simulate the look of horizon:
Hi,
It depends of the landscape (forest? fields? sea?) and the relief you want. In landscape design (handmade), the common technic is to first, draw your plan from the top (that’s obvious if you want to be accurate and coherent), and then if you want an elevated plan on a clump or a bond, you put a point A and B on your plan and imagine what is in the view between those 2 points. I didn’t make any landscape on Blender (yet) so I don’t know if that technic would be really efficient.
The other technic would be to start from the background so you directly see what is in the field of view and what not. That’s pretty obvious that you will also not be annoyed with the “just created models”.
I still think that Blender is a pain for landscape design, I don’t know if there are addons to make the things better. If only AutoCAD Civil 3D could have the blender renderer quality… 
After a bit of playing around, I found that making a large cylinder on its side and making the camera angle really narrow kind of gives me the result I’m after. I’m trying to make a sort of 80s wireframe environment, and the bonus about doing it this way is I can rotate the cylinder to give the impression of motion…
To do a good horizon, you should mimic reality. The world is not flat. Actually, the whole concept of a horizon is not “things becoming very small” but " things getting hidden behind the earth surface"
So for a realistic result, the world should be a very big sphere, and anything moving “towards the horizon” should be following the curve of the sphere. If you want to mimic earth, the radius of the sphere should be about the same. If you make the sphere much smaller, it will feel unrealistic.
If I remember correctly, when standing on the ground, the distance to the horizon is about 5 km. When standing higher (in a building) it is much further. A simple calculation using pythagoras and the radius of the earth tells you how far the horizon would be.