Change bounding box scale
 
 
 
WarningBe careful if you have an animation that changes the relationship between the displacement and the size of the surface being displaced. Choose the most extremely-displaced frame to perform the Calculate Bounding Box Scale operation. Alternatively, animate the value manually.

To change the bounding box scale

  1. In the Memory and Performance Options section of the Render Settings window, turn on Use Displacement Bounding Box (it is on by default).
  2. Estimate how much the surface will grow when it is displacement-mapped. Consider the following:
  3. Render.

    If the estimated bounding box scale is too small, a warning message appears in the render log with instructions on how to set the bounding box scale correctly. An example message:

    Warning: The bounding box is too small for shape “surbsSphereShape1”. Reset the bounding box scale to: 1.56778 1.56778 1.56778. You can use the following mel commands: setAttr nurbsSphereShape1.boundingBoxScale -type double3 1.56778 1.56778 1.56778;
  4. Adjust the bounding box scale as recommended in the render log message.
  5. Render again.