Rendering to texture, or “texture baking,” is controlled by this dialog. Most of this dialog's controls are contained in its rollouts.
To bake an object's texture:
There are a lot of options for rendering to textures. These are the basic overall steps.
Ideally, the object will have a texture assigned to it, or lights and shadows that fall on it, and so on.
The elements you chose to render are rendered to files, and the baked texture is displayed in shaded viewports.
To bake the texture of multiple objects:
Textures are rendered for all the objects you previously set up.
Renders the scene, or the elements listed in the Objects To Bake rollout.
Applies the Automatic Flatten UVs modifier to all selected objects without rendering anything.
Closes the dialog and saves any changes to settings you have made.
When set to Views, the original or baked material is displayed in the viewports. When set to Render, the original or baked material is used in the rendering.