Here is some information you may find useful when working with envelopes.
X-ray mode is a viewing option that lets you see through objects in Constant, Shaded, and Textured display modes. This is very useful when working with envelopes because you can see and select the underlying deformers while still seeing the shaded surface of the envelope.

To turn x-ray mode on or off
1. Open the Camera Display property editor using one of the following methods:
- To affect a single viewport, choose Display Options from the Display Type menu in the upper-right corner of the viewport.
or
- To affect all viewports, choose Display > Display Options (All Cameras) from the main menu bar.
2. On the Display Mode page, select the XRay Shading option and choose an XRay Display Type:
- Overlay draws the deformers on top of the envelope.
- Screen draws a semi-transparent envelope so that you can see the deformers inside.
You can mute envelopes in the same way as other deformations. This gives you faster performance because you can pose a skeleton without continuously updating the envelope as you work.
To mute an envelope while posing the deformers
1. Select the envelope.
2. Do one of the following:
- In an explorer, right-click the Envelope Operator and activate Mute.
or
- On the Select panel, choose Selection and click the icon of the Envelope Operator to open its property editor. Activate the Mute option.
Click the Lock icon
to prevent this property editor from being recycled so that you can easily unmute it later.
3. Pose the deformers.
4. When the skeleton is in the desired position, unmute the envelope.
Transferring and Merging Envelopes
You can transfer and merge envelopes between objects in your scene. See Attribute Transfer [ Modeling and Deformation Basics ] .
Combining Envelopes with Soft Body Deformations
If you want to combine a soft body and an envelope deformation on an object, you should apply the soft body operator before the envelope.
Another technique you can use is to apply soft body to an envelope deformer. Note that you cannot apply soft body directly to a skeleton because it has no points; however, you can parent objects to bones, apply soft body to the objects, then use them as envelope deformers.
Using Volume Deformations with Envelopes
If you are parenting volume deformers to a skeleton and using them to create bulging muscles on your envelope, make sure that Envelope Mode is active in the Proportional Volume Operator property editor. This option makes the volume deformation relative to the parent (in this case, the skeleton deformer), so that the volume deformation gives the expected results as the skeleton moves.
It’s also a good idea to always apply the volume deformation to a cluster, so that the volume deformer does not affect unwanted areas of the envelope as the skeleton bends.
For more information about volume deformations in general, see Manipulating Points by Volume [ Modeling and Deformation Basics ].
Autodesk Softimage v.7.5