Oh gosh. I love your question.

1) Make sure you take a 360°x180° panorama. A spherical one. I just posted some diagrams to make sure you have a good technique while taking the pictures. Do I "need" a panoramic head to shoot 360 panoramas?

It dosen't matter if you won't use it all 360°, shoot it anyway.

This is important so the spherical environment for your 3D render has the correct proportion.

Here is a link for some aditional notes on the proportions of the panorama: http://www.otake.com.mx/Apuntes/Imagen/EnviromentMaps/

2) The important thing is just the relative position from the camera to the object, and the distance to the floor.

If you prepare a rough sketch in the 3D program to determine an interesting point of view you can use it as a reference for the real world picture.

I want this picture

This is my blueprint

• You need to mesure the yellow arrows at least.

• Or make a grid (blue)

• Make a realistic aproximation. If the camera angle looks cool at 2.5 mts. height, but you don't have a lift truck, position your camera at the real height of your tripod.

3) You need to have some reference points Make some topographic marks (a stick with a clear mark where the leveled zone is), at least 4 corners. I asume you need to build a concrete base, so mark in real space where the corners of that base should be. (Green dots)

4) Try to make some marks for proportion. Probably you can not make them the real size but make some, for example you will know that the magenta dots are 1m tall.

5) Don't make just 1 blueprint. Prepare alternative scenarios.

6) It dosen't really matter the orientation of the shoot, just the relative position to the elements but you can mark the direction of the sun or the magnetic pole on a printed blueprint as a reference, probably for some ilumination adjustments.