It's been awhile since I've been active here - briefly had other interests, but thought I'd still hang around. I'm trying to get a generated mountain heightfield in the distance here. First, I generated and moved the heightfield into the scene. I deleted everything and copied cords to the shader then generated. In the camera view it all looks good. In the render view, there are no mountains, and same in the render.
Have a look and thanks for any insight. I've run out of options.
The mountain is there, but it's so far from the camera your haze is obscuring it completely. Perhaps a distance shader plugged to your final density of the haze and adjusted may help reveal the mountains and keep the haze along the horizon.