3ds max units setup

3ds max units setup

3ds max units setup. In order to set up a scene, you are first required to select a unit display, set system unit, and grid spacing. These are the pre-requisites and helpful before you start creating any 3D objects.

Warning: Change the system unit value before you import or create geometry. Do not change the system unit in an existing scene.

Because of the nature of digital floating-point calculations, distances that are extremely large or extremely small can cause round-off error. Symptoms of round-off error include trouble navigating (zooming and panning become too fast or too slow), unwanted viewport clipping, and unexpected flipping of normals. Here are some general guidelines to avoid these problems:

  • Make sure your scene is roughly centered around the origin (0,0,0).

    Round-off error increases at large distances from the origin.

  • Make sure no significant detail in the scene is smaller than one generic 3ds Max unit.

System vs. Display Units

It is important to note the distinction between System and Display units. Display units only affect how geometry is displayed in the viewports. System units determine the actual scale of geometry. For example, if you import a DXF file (unitless) containing a 1 x 1 x 1 Box, 3ds Max could import the box’s dimensions in inches or miles, depending on the System unit. This can have a significant impact on your scene, which is why it’s important always to set up the system unit before you import or create geometry.

Units setup

The Units setup dialog box allows you to select a display unit scale and set a system unit. You can open the Unit setup dialog box by selecting the unit setup command from the Customize menu. Refer to image below for the Units setup dialog box.

3ds max units setup

Display Unit Scale

Choose a unit scale option (Metric, US Standard, Custom, or Generic Units) to activate its settings.

  • Metric Choose this option and then choose a metric unit: Millimeters, Centimeters, Meters, or Kilometers
  • US Standard Choose this option and then choose a US Standard unit. If you choose a fractional unit, the adjoining list activates to let you select the fractional component. The decimal units require no additional specification.

    The US Standards are as follows:

    • Fractional Inches
    • Decimal Inches
    • Fractional Feet
    • Decimal Feet
    • Feet w/ Fractional Inches
    • Feet w/ Decimal Inches

    For the last two items, you can specify which unit is assumed when you enter a value in a numeric field and press Enter without including a units specifier, such as ‘ for feet or ” for inches.

    For example, if Feet is the default, typing 5 followed by Enter results in 5 feet. Typing 5″ followed by Enter results in 0’5″. If Inches is the default, typing 5 followed by Enter results in 0’5″. Typing 5′ followed by Enter results in 5 feet.

  • Custom Fill in the fields to define a custom unit of measurement.
  • Generic Units (The default.) A Generic or “system” unit in 3ds Max is equal to one inch. You can treat it as an arbitrary unit of your own definition, unless your scene uses features that depend on real-world measurements, such as photometric lights, Use Real-World Scale for bitmaps, and so on.
    Warning: If you are modeling an object that includes details whose dimensions are very much less than one inch, treat the Generic unit as an arbitrary unit that is smaller than one inch: for example, 1 unit = 1/50 of an inch. Otherwise, you might encounter problems with your model that are due to roundoff error.

Lighting Units group

Use the drop-down list to choose whether light values are displayed in American or International units.

So, this is 3ds max units setup. Thanks for reading. Thanks to Knowledge Center, Autodesk.


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