: How to place a 3d object in a photo with correct measurements? I want to make a Infographic, which shows how much water is flowing down a river per sec. To do this I want to make a photo

@Courtney577

I think you could do this placing a few guides on your image.

Since it is an outside scene, you should be able to get realistic results using a simple one-point perspective.

Photoshop has a Filter called Vanishing Point that can help you a lot.
There is also Edit > Transform > Perspective, but any free-transform tools should work for you.

The most important thing is to get some measurements of objects that are in the scene for reference. These could be:


Road width or River span
Benches, trashcans or any other objects you know the dimensions of
Placing a large object into the picture like a 1x1m cardboard or measuring tape extended to a certain length. Ideally both


I think you'll get the best results taking 2 or more photos with a tripod.
The first photo is the one you'll use for your final image. The second photo has to be taken from the same perspective (hence the tripod) with anything that marks the size and position of the base of the brick like cardboard, paper, etc. The most important one is the brick closest to your camera!
If your brick is too large for one cardboard or paper you could place markers in each corner like sticks, pencils, anything bright or easily distinguishable from the ground and then take the second photo.

The Photoshop "Vanishing Point" filter is very convenient, since you can draw your first brick where you placed the marks in the photo and then, using the filter, you can clone the rest as deep and high as you need.
Otherwise you'd need to draw a grid based on the reference markers of your second photo to get the perspective right

I hope this gets you started!

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@Alves566

You just need a point of reference. For example a trick for interior is using a doorway.

Your image is an outdoor shot, so it will be harder to use a reference, however, there is a way.

Since you're making this infographic, you must have the data. Therefore you can work backwards. If you know that the amount of water from you data is say 200m³ then you know you need to design the cube shapes to be 1/200 the size of the area they will fit.

(I believe FAR more water than this flows through most rivers if using a per second volume)

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