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You should understand the good organization of objects in 3DCoat (Think the same for Max & Maya).
– the object is just a set of polygons; it is independent of UV sets.
– materials are also sets of polygons; usually, the UV set contains several materials.
– UV sets correspond to textures. They, in general, exist independently on objects.
– layers exist through all objects and UV sets.
So if you bake objects in the paint room from retopo room it creates one object, materials that correspond to poly-groups (Paint Objects panel), and UV sets that correspond to UV sets in retopo room (Surface materials panel).
Every bake retopo→paint creates this set. So objects and UV sets may be related, but it is not 1:1 correspondence.
If you do some simple retopo pieces and bake, you will get one object, material, and UV set. Better if at least UV sets will have unique names. If you bake objects from the File menu, it will create additional objects, materials, and UV sets.
Bake selected only: Bake in the Paint Room only those faces currently selected.
Import coarse mesh: Bake a mesh in the Paint Room with the number of polygons specified.
Use name correspondence for baking: Assures that only Retopo Groups bearing the same name as their Voxel Layer counterparts are Baked into the Paint Room. You may use this option to simplify Sculpt Object Baking if the names of Retopo Objects correspond to Sculpt Object names. If you check the option, each Retopo Object will be baked using only the Sculpt Object of the same name and its children.
Correspond Retopo Object w/ Sculpt Object: This function will help find Retopo Objects with corresponding Sculpt Objects. If there are any corresponding objects with similar names, the Retopo Object will bake only the details from the Sculpt Object with the same name.
Bake normals with dithering:
Quick Start: Retopo Baking: This video demonstrates the Retopo Baking toolset.
Baking Scan Settings
Import Object for Per Pixel Painting
Normal Map Software Preset:
Initial subdivision: Set the initial subdivision of the object for a smoother look (if needed).
UV-mapping type: Keep the original UV or choose Auto-mapping.
UV-set smoothing: This option works only if you subdivide the model during import.
Z-up coordinate system Z-up based coordinate system for compatibility with Rhino, 3DS-Max, and other applications with Z-axis up.
Import Tiles as UV sets. Import separate UV tiles as separate UV sets.
Triangulate: Triangulate a mesh to avoid UV glitches.
Weld Vertices Weld separate vertices that are at the same point in space.
Invert Normals
Lock Normals Don’t recalculate normals; use normals directly from the object file. If you subdivide mesh, this option will be ignored.
Don’t Snap Subdivision Vertices to Surface: This option helps to avoid snapping the subdivided mesh to the surface of the high-poly mesh. It makes the Layer0 mesh very smooth. In this case, all displacement (normal maps) will be placed on higher layers. This option is very helpful if you export a low poly mesh and displacement map.
No Center Snap 3D-Coat tries to move a bound box of the model to the scene’s origin by default. Check this box if you want to import the model as is, without any centering.
Set sharp edges (split normals) over UV seams
Auto smoothing groups: This option allows the creation of smoothing groups automatically. By specifying the value in the “Maximum angle” option responsible for the maximal angle between faces when the edge becomes sharp, it is necessary to activate the Auto smoothing groups option. To use this option, turn the Auto smoothing groups on.
Treat Poly Groups as Paint Objects
In this mode, each material of the object will be treated as a separate UV set (separate texture) regardless of initial UV sets. If you deselect “Treat Poly Groups as Paint Objects, your paint Objects or Poly Groups layers be converted to surface materials, and you only now will have one paint object but with several surface materials. Rename your Paint object as a combination name of all the Poly Groups layers.
UV-set name: Enter UV-set name.
Texture width: Set texture width.
Texture height: Set texture height.
• Note: If your video card has less than 2GB of Vram, you should avoid textures larger than 2000 x 2000.
Baking Options
Bake sculpt mesh onto paint room mesh: This command will bake changes in the Sculpt room object to the Paint Room object and update the paint layers in the process. Previous paint layers will be preserved (whenever possible), while newly baked maps will be assigned new layers. This command takes the paint scene object as retopo mesh and bakes details and color from Sculpt scene to the painted object.
Update Paint Mesh with Retopo Mesh: This command will replace the currently visible Paint Room object(s) with visible Retopo Mesh.
It allows updating normal maps and color layers related to volumes. Pay attention that painted areas on sculpt mesh will overwrite painted areas on the paint room object. It works only for the per-pixel painting approach. So be careful to avoid losing data.
A UV set is required, but if you have not assigned a UV set, it will be generated automatically.
Layers will be kept, but UV-s of retopo mesh should be similar to the paint room mesh. The operation is not undoable, so we recommend you save the scene before the attempt to replace geometry.
Bake with Normal Map (Per-Pixel): Bake the Retopo mesh from the currently selected Retopo Group into the Paint Room and the “Objects” Panel for texturing using the “Per-Pixel” method. Details are baked as a Normal Map on a special layer. Displacement will not be baked.
A dialog is presented which allows Import Object for Per Pixel Painting.
Retopo→per pixel (no baking): Bake only the Retopo geometry without projecting details into the Paint Room and Objects Panel for per-pixel painting.
Bake w/ Normal Map (Per Pixel) + Flat Displacement: Bake objects for per-pixel painting and bake normal map on special layers.
Displacement will be baked as flat displacement to each triangle. The layer “FlatDisplacement” will be hidden and available to export.
Bake w/ Per Pixel Painting w/ Displacement: Baking of displacement per pixel painting may produce the wrong result in some cases because per pixel painting works poorly for deep displacement.
Bake with Ptex: Takes the mesh as defined in the Retopo Group for an object and bakes it into the Paint Room and “Objects” Panel, making it ready for texturing operations using the Ptex method.
Retopo→PTEX (no baking): Bake only the outer “hull” of the Retopoed object into the Paint Room and Objects Panel for texturing using the Ptex method.
Bake Into Scene (Microvertex): Bake patch into the scene. This operation requires a UV set. The patch will be projected (baked) onto the old mesh, and the layer structure will be preserved. Readies mesh for texturing using the “Micro-Vertex” method.
Retopo→microvertex (no baking): Readies the Retopo mesh for texturing using the “Micro-Vertex” method but uses only the “raw” form of the mesh and performs no “baking” operations. Merges the result into the Paint Room and “Objects” Panel.
Exporting a Displacement Map: A step-by-step video showing how to bring in a low poly UV’d object and sculpt additional details onto it, then how to bake out a displacement map and view it onto the low poly model by Industry Tuts.
How to bake out Displacement Maps
A short tutorial showing how to bake out and export Displacement maps in 3DCoat.
Texture Baking Tool
Bake texture (Deprecated): Invokes the Texture Baking Tool, which allows you to bake the Diffuse, Specular, Normal, and Displacement textures already applied to your “Baked” Retopo mesh onto a similar, external polygonal mesh file.
Tutorials
Texture Baking Tools: This old video demonstrates a few texture baking improvements/additions as of 3DCoat V4 (currently outdated).
Texture Baking: This video demonstrates the Texture Baking process in 3DCoat. Explaining in general terms, how the process typically works, including Sequential Texture Baking.
Bake Settings Dialog Old Version for V4: This video continues the demonstration of the Texture Baking/Merging to Paint Room process. It covers the “Bake Scan Settings” dialog in detail, where to find the “Happy Baking Guide” pdf, and clearing the Paint Room (to prevent duplicate meshes and paint layers) when re-attempting a bake.
EDIT: As of build 4.0.10, there is no longer the need to exit the Bake Settings Dialog to switch UV maps when applying local “Zones” to the model.