By default Interactive Redraw, an option in Envelope and Bulge sub-object levels, is turned off. After changing an envelope the mesh is refreshed on mouse up. Turn this option on for interactive viewing of how envelopes and bulges are affecting vertices. As you adjust the envelopes, the vertices move to show the effects of the resized envelopes
You can change the display settings for envelopes and their component parts. Click the associated color sample to open the Color Selector and change color setting for:
Inner and outer bounds on both deformable and rigid envelope types.
Differently weighted vertices, as they fall within the inner bound, or between it and the outer bound.
Turn on or off the associated check box to determine whether any of the above envelope components are displayed.
Number of sides for inner and outer bounds. The default is 4.
Choose Initial Skeletal Pose if you want to work in the position of the mesh and its skeleton at the time Physique was applied. Returning to this pose can be useful if the display becomes confused with the effects of unassigned vertices when the character moves through an animation.