3D Printing with ZBrush
Illustration by John Hersey

Dealing with scale offset


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3D Printing with ZBrush

with Ryan Kittleson

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Video: Dealing with scale offset

The Z brush has another way to throw us a curve ball when dealing with scale. Sometimes Z brush will apply a scale multiplier to a model. It's kind of like a fudge factor that can really put a kink in your measurements. Let's see what can happen and how to fix it. Now scale offset is something that happens sometimes and it can be a bit unpredictable when it's going to happen. So this exercise file already has the problem built into it. Now there's one big indication that you have this scale offset problem. And that's when you're transposed manipulator measurements don't agree with your geometry size measurements.
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Watch the Online Video Course 3D Printing with ZBrush
1h 14m Intermediate May 30, 2014

Viewers: in countries Watching now:

Prepare your models for 3D printing with ZBrush, the popular program for 3D modeling and digital sculpting. Learn how to measure your models with real world units, so everything prints at the right size; save on material costs by hollowing out your models; and make sure your colors print true. Author/artist/3D aficionado Ryan Kittleson also shares some advanced tips and tricks for getting the best results from your particular printer.

This course was created by Ryan Kittleson. We're honored to host this training in our library.

Topics include:
  • Combining multiple objects
  • Sizing an object with real-world units
  • Fixing parts that are too thin
  • Cutting models into smaller pieces
  • Making models hollow
  • Working with color 3D prints
Subject:
3D + Animation
Software:
ZBrush
Author:
Ryan Kittleson

Dealing with scale offset

The Z brush has another way to throw us a curve ball when dealing with scale. Sometimes Z brush will apply a scale multiplier to a model. It's kind of like a fudge factor that can really put a kink in your measurements. Let's see what can happen and how to fix it. Now scale offset is something that happens sometimes and it can be a bit unpredictable when it's going to happen. So this exercise file already has the problem built into it. Now there's one big indication that you have this scale offset problem. And that's when you're transposed manipulator measurements don't agree with your geometry size measurements.

So, let's go to the move transpose tool and we've got a manipulator here from top to bottom it's about 100 centimeters. Now, let's go to geometry and in the size sub palette, you can see here that the height is reported to be 21 centimeters. So, that's a big difference. Now, the reason we're getting this offset is because under export. There's a measurement right here called scale. Now when your modeling for 3D printing you always want to keep this value at one.

So I'm going to click the slider, hit one and hit enter. This makes sure that the units of the model are in a one to one ratio with the units of your scene. Anything else and there will and incongruity and measurements will get real confusing real fast. I recommend checking on the slider from time to time to make sure that it's set to one. Now you can automatically set all of your sub-tools in a scene to one by going to the plug-in menu, sub-tool master. And sometimes this menu closes.

And click, scale offset. That will fix the scale offset to 1 for all of the sub-tools in your model. Now, there's another scale value that can be off. And that's the transpose manipulator. So you can see here, our transpose manipulator is set to centimeters. And it's currently reporting 20 centimeters tall. Okay, so now let's compare our transpose manipulator measurement to the geometry. Okay, so now they're agreeing with each other. We've got 21 as the height here and the manipulator is reporting about the same number.

The difference is just because I haven't positioned his manipulator precisely to the top and bottom. Now there's one other scale value that can really mess things up, and that's the transpose manipulator. So let's go back up to preferences, and go to transpose units. And let's look at unit scale. Now this is set to one by default and that's where you want to keep it. This is a manipulator to the ruler scale, just like we looked at before with the scale offset was a multiplier to the object scale. Unless you really know what you're doing, do not change this from one.

So, there are two things that can cause a lot of headaches if you don't know how to watch out for them. Now, that you know what kind of trouble they can create for you, you know how to spot it and how to fix it.

There are currently no FAQs about 3D Printing with ZBrush.

 
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