Rendered Image Histories (Concept)

The render history maintains a list of recently rendered images generated from the currently loaded model.

Each image that is rendered to a file or the Render Window is recorded with the drawing as a history entry.

Understand History Entries

History entries store data pertaining to renderings made from the current drawing.

Each history entry contains information about the images that have been recently rendered. The information stored in history entries includes

Date and time of the rendering task
Statistics for the rendering task
Current view or the name of a stored view
Active render preset name
Active render settings, such as output resolution
Size of a cropped region, if crop was used for the render task

NoteRendered images are not stored in the history entry, only a link to the image location.

History Entry Information

Aside from the statistics, history entries contain five pertinent pieces of information.

Output File Name: Holds two pieces of information: the name of the rendering and its state. If you specify an output file, that name is listed in the field. If you have not specified an output file, the drawing name is listed with a temporary suffix.
Output Size: Tells you the output resolution for the rendered image.
View: Is always the current view unless you’ve chosen to render a saved view. In that case, the view name is displayed.
Render Time: Shows the date when the image was rendered and the amount of time it took to render.
Render Preset: Displays whatever render preset was used by the renderer to generate the image.

History Entry Creation

There are some rules that delegate when a history entry is created and if that history entry is stored with the current drawing. The destination setting is the primary factor that determines if a history entry is created. The following table outlines the circumstances of when a history entry is created and when it is saved.

Destination	History entry created?	Entry saved with drawing?
File	Yes	Yes
Render Window	Yes	Only if the Render Window view is saved
Viewport	No	Not applicable

Any history entries that are generated, but not saved with the drawing only exist for the duration of the current drawing session. Once you close the file or exit the program, unsaved history entries are lost.

History Entry States

There are four states in which a history entry can appear in the Render Window.

Normal: When you specify an output location and file name for a rendering, the history entry is created and saved with the drawing. This history entry is in a normal state and the file name you specified is displayed in the File Name column of the render history section of the Render Window.
Temporary: A temporary history entry occurs when you render an image only to the Render Window without specifying an output file. This history entry remains in memory until the drawing session ends. Temporary history entries have a -TempXXX suffix appended to their Output File Name listing.
Empty: When you specify an output location and file name for a rendering, the history entry is created and saved with the drawing. This history entry is in a normal state and the file name you specified is displayed in the Output File Name column of the render history section of the Render Window.