Software to create perspective line with curves

Question

What software and tools can I use to quickly create lines over single or multiple photographs that have the effect of disappearing into the distance? Sometimes the line would need to have curves. I would also like the line to reduce opacity as it disappears in the distance.

Take the following base image for example:

The very crude hand drawn example below shows how I would like the line to curve in line with the road. However, I would like the line to be wider in the foreground and become narrower as it disappears in the distance.

The following screenshot shows a one point perspective grid in Adobe Illustrator with a rectangle drawn. I am unsure how to add curves and reduce the opacity over the length of the line. I have tried using the line tool in Ilustrator and increasing the width but this does not work. Rather than drawing a rectangle am I able to draw a line with curves but still obtain the desired effects?

What software packages would enable me to quickly and efficiently perform these tasks over single and multiple photographs?

I have access to a variety of software packages including Autocad, Adobe Illustrator and Inkscape but would consider purchasing other packages.

Answer 1

Just to add to Danielillo's excellent answer, something similar is also possible using Inkscape's Interpolate extension.

Reducing the opacity of lines in the distance could be achieved using a mask, made from a gradient.

Answer 2

With Illustrator

• Make two irregular lines at the border of the street

• Select both lines, Menu Object > Blend > Make
• Menu Object > Blend > Blend Options > Specified Steps = number

• Stroke the blend with a linear gradient

  • From black to black
  • From 100% to 0% opacity
  • Angle=90%
  • Move the Gradient Slider

• Direct Selection Tool, select a vertex and move the Live Corners widgets to round it, do the same with the other vertex