Creating a simulation with perspective in Virtual Vision is not difficult, but needs some preparation. First, we need that our image has clear perspective lines so we can create and integrate correctly the simulation.
This would be a good example. Then we have to look for the focal point of the image, creating a perspective line with its own elements (in blue).
Once we have this, we can define the edges of the simulation, with the top ideally in a horizontal line (in red).
Don't worry if the object goes outside of the image, it's what we have to do. We'll flatten all these lines into a new layer and we'll create a new selection with the exact same size as our total simulation. When we're done with creating the simulation we can switch it with the proper mask.
We can open Virtual Vision and create an object following the red lines. It will for sure go outside the image, this is normal.
We set the preferences of grid size to a reasonable size (50 cm would be the most reasonable) and we introduce a measurement on the simulation. Usually, we'll have to refine it, so don't worry if it's not the proper size.
We can use the Scale tool on the secondary window to adjust the size into its proper proportion. For now just focus on the width of the grid, not on the height. Remember that the bigger the size of the selection on the visualization window, the smaller it will appear on the simulation.
Once we have a reasonable proportion in width, we can focus on the height. We create some horizontal subdivisions and we adjust the height in the visualization window. Again, the more height you add to the visualization window, the more rows you'll have. Usually, the closer you are, the fewer rows you need, and vice-versa. Adjust each section and add more sections until your simulation looks natural.
Now you can click OK to exit Virtual Vision, hide the layer with lines and select the original one, and open it again to see the effect. You can also switch the maks you're using into the proper ones. Using a 1m2 tile to check the proportions of the simulation is also recommended.