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System Unit Scale - do I allways need to set it to inches?
show user profile  Nanne
Hello mates, I need some help sorting this thing out in my head :)

My teacher once told us to NEVER set the System Unit Scale to anything other then inches. Because mental ray works with inches when calculating lights, so if you set it to meters or millimetres the calculation gets messed up. Is this true, or is he wrong (again)?

How do you work with the System Unit Scale? Lets say I want to model a house like 10x7 meters or so. But I also want to model details inside, like the wall border that goes along the walls along the floor (what's it called in English?) that should be like 1cm thick. So I have measurements that varies between 1 cm and 10 meters. How would you set up the System Unit Scale?

I was thinking in the line of something like this:

If I display the measurements as meters I don't have to type in 4000, when I want to create a wall that is 4 meters. But Max keeps tracks of the millimetres for me and keeps the accuracy tight, right?

Cheers mates! :)

Kristoffer Helander
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read 810 times
3/15/2010 7:58:01 PM (last edit: 3/15/2010 7:58:01 PM)
show user profile  owtdor
I was always taught to NEVER screw with the "System Units Setup" because all lighting was based off of it. If I want to work with a different measurement system like metric or generic units, just select it in the "Units Setup" area. It will convert itself where necessary on the backside.

read 797 times
3/15/2010 8:13:54 PM (last edit: 3/15/2010 8:13:54 PM)
show user profile  Westcoast13
I'd been told to leave it in inches as it just works better that way.

My Turbosquid Area

read 794 times
3/15/2010 8:15:34 PM (last edit: 3/15/2010 8:15:34 PM)
show user profile  Dub.
cm works fine for peeps in metric land.

read 791 times
3/15/2010 8:24:41 PM (last edit: 3/15/2010 8:24:41 PM)
show user profile  Nanne
So cm is close enough to inches to not cause any problem? But do you gain any benefits from changing it to cm?

The manual says you should change the Unit Scale depending on the size of what you are modelling, it goes like this:

"The resolution of measurement diminishes as the distance to the origin of space increases, so you need to consider space granularity when you choose a scale for your project. If you're modeling an island, for example, this calculator can help you determine the smallest object you should model on the island. In other words, don't use a unit scale of millimeters if you plan on modeling an island that's many miles across."

But keeping to inches it the safest bet?

Kristoffer Helander
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read 789 times
3/15/2010 8:31:01 PM (last edit: 3/15/2010 8:31:01 PM)
show user profile  advance-software
Run some lighting tests. That way you can tell if there are any issues.

It may well be that there were problems in the past that have been fixed long ago.

Max shouldn't care what units you use.

read 779 times
3/15/2010 8:50:51 PM (last edit: 3/15/2010 8:50:51 PM)
show user profile  Dub.
I'm working on a feature at the moment in cm

Everything is working great including physical lights.

read 767 times
3/15/2010 10:06:01 PM (last edit: 3/15/2010 10:06:01 PM)
show user profile  Nanne
Dub what benefits do you see from switching from inches to cm?

Kristoffer Helander
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read 749 times
3/15/2010 11:38:49 PM (last edit: 3/15/2010 11:38:49 PM)
show user profile  gogodr
yeah.. am I the only one what works in meters?

Hello there

beautiful ;3

read 742 times
3/16/2010 12:09:47 AM (last edit: 3/16/2010 12:09:47 AM)
show user profile  Dub.
inches are from ye olden times.

Meters work fine when you are working on a whole city scale.

read 738 times
3/16/2010 12:16:33 AM (last edit: 3/16/2010 12:16:33 AM)
show user profile  Vivifyer
I work in meters for large exterior scenes, and mm for interiors. inches when we work on international projects, or if a plug-in we use demands it :P -cough pen rig cough-
Vivifyer - Lastpixel

read 727 times
3/16/2010 1:11:57 AM (last edit: 3/16/2010 1:11:57 AM)
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