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
- In the Memory and Performance
Options section of the Render Settings window,
turn on Use Displacement Bounding Box (it
is on by default).
- Estimate how much the surface will grow
when it is displacement-mapped. Consider the following:
- If the bounding box of the displaced
surface will be more than 50 percent larger than the bounding box
for the original surface in World Space, open
the surface’s Attribute Editor and enlarge
the bounding box scale.
- If the bounding box of the displaced
surface will be less than 50 percent larger than the bounding box
for the original surface in World Space, open
the surface’s Attribute Editor and reduce
the bounding box scale to optimize the rendering speed and memory.
- If you choose to let Maya automatically
compute the proper bounding box scale for the displaced object,
click Calculate Bounding Box Scale in the Attribute
Editor and Maya automatically sets the bounding box scale for
the surface.
- 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 “nurbsSphereShape1”. 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;
- Adjust the bounding box scale as recommended
in the render log message.
- Render again.