Adobe Photoshop CS6 User Manual page 704

Scene Settings Lights in the form of a spherical panorama shine onto the object; choose a style of lights from the menu. Render Settings
control how object surfaces look. (See Select a render preset.) Higher Mesh Quality settings increase mesh density, improving appearance
but reducing processing speed.
The Shaded and Solid Wireframe render settings superimpose the 3D mesh on objects, revealing any mesh distortion that will distort
textures.
Readjust repoussé settings
1. Select a text layer, layer mask, or work path to which you previously applied repoussé.
2. Choose 3D > Repoussé > Edit In Repoussé.
Split repoussé meshes
By default, the Repoussé command creates a single mesh with five materials. If you want to separately control different elements (such as each
letter in a string of text), you can create separate meshes for each closed path.
Note: If numerous closed paths exist, the resulting meshes can create highly complex 3D scenes that are difficult to edit.
1. Select a text layer, layer mask, or work path to which you previously applied repoussé.
2. Choose 3D > Repoussé > Split Repoussé Meshes.
Understanding internal constraints
Internal constraints let you improve mesh resolution in specific areas, precisely vary inflation, or poke holes in surfaces. Along a path you specify
on a repoussé object, constraint curves extend away from the object for an expansion, or toward the object for a contraction. You manipulate
these curves using constraint tools that are similar to 3D object tools.
Inactive constraints Guarantee sufficient mesh resolution, creating smooth paths.
Inflated object with inactive constraint
Active Constraints Expand or contract the surface along constraint paths.
Dragging active constraint to different position in 3D space
Hole Constraints Cut out the surface along constraint paths.
Panning hole constraint to increase depth
Create internal constraints from selections, work paths, or text
1. Do one of the following:
Create a selection or path that falls entirely within the front surface of a repoussé object.