Units and Scale – Fix your scene scaling

Lesson by admin | Official 5SRW study material


What is really important working in 3ds Max, V-Ray and photorealism is just
REPLICATING THE REAL WORLD.

If I tell you that door height is 2,20 meters or I say that’s 220 centimeters this is exactly the same. I can also say that the door height is in inches 86,6 inches, it’s the equivalent of 220 centimeters.

Units of measurement do not affect how much the door is really height.
2,20 m = 220 cm = 86,6 inches etc..

Choose cm for interiors or meters for exteriors because this is more comfortable for you, but V-Ray considers meters, centimeters, inches exactly in the same way.

 

PROBLEM START WHEN YOU DO NOT WORK IN SCALE 1:1

Working in scale 1:1 means that 1 meter in your project corresponds to 1 meters in the real world, and this is fine. But sometimes 3d models have a different/wrong scaling, they are for example in scale 1:20. That means 20 real meters will be represented with 1 meter in your 3d world!

This situation create a false/reduced world, which is not real. This is  the real problem.

When you work out of scale, measurements are completely wrong. It’s not about of little differences, it’s about huge differences: you can have a door of 2 centimeters or 2 kilometers.

 

QUICKLY CHECK IF YOUR SCALE IS CORRECT 

When I want to quickly check if I’m working in the correct scale I simply use the tool “Tape”..

tape

 

..then and active 3D Snap tool to measure some distance I know. For instance a height door:

tape-measure

In “Lenght” I read 225 centimeters, which is consistent with a real door in the real world.
This tell me that I’m working in the correct scale.

Conversely when I’m in the wrong scale this parameter could display 2 centimeters, or 2 kilometers. I mean, something totally out of reality.

 

FIX THE SCALE OF YOUR SCENE

First of all you need to correctly set up your units before you start working (check 3ds Max – Lesson#1)
In case your scene is not in the correct scale, you can easily rescale all using the “System Unit Scale“:

units

Its default value is 1,0 (*):

  • If you put 10, all the scene became 10 times bigger
  • If yout put 0,1 all the scene becale 1/10 than before

And so on

Note that in certain circumstances you need some trial to let your 3d model matching with consistent measures.

 

 (*) Do not care the units a side of 1,0: just keep focused on this value to rescale your scene

 



For support please contact: support@learnvray.com