General Output OptionsDocumentation
Height and Width of Output
||Sets screen height to n pixels|
||Sets screen width to n pixels|
These switches set the height and width of the image in pixels. This specifies the image size for file output. The preview display, if on, will generally attempt to pick a video mode to accommodate this size but the display settings do not in any way affect the resulting file output.
Max Image Buffer Memory
||Sets the allowable size of the output image cache|
This INI parameter sets the number of megabytes of RAM to allow for output image caching. If the output image happens to use more than this, a file backed temporary image is used instead. If using this option you must specify a value. This option is on by default and its value is 128.
Partial Output Options
||Set first column to n pixels|
||Set first column to n percent of width|
||Set first row to n pixels|
||Set first row to n percent of height|
||Set last column to n pixels|
||Set last column to n percent of width|
||Set last row to n pixels|
||Set last row to n percent of height|
When doing test rendering it is often convenient to define a small, rectangular sub-section of the whole screen so you can quickly check out one area of the image. The
End_Column options allow you to define the subset area to be rendered. The default values are the full size of the
image from (1,1) which is the upper left to (w,h) on the lower right where w and h are the
Height=n values you have set.
Note: If the number specified is greater than 1 then it is interpreted as an absolute row or column number in pixels. If it is a decimal value between 0.0 and 1.0 then it is interpreted as a percent of the total width or height of the image.
Start_Column=0.75 starts on a row 75% down from the top at a column 75% from the left. Thus it renders only the lower-right 25% of the image regardless of the specified width and height.
+EC switches work in the same way as the corresponding INI-style settings for both absolute settings or percentages. Early versions of POV-Ray allowed only start and end rows to be specified with
+En so they are still supported in addition to
When rendering a subset of columns (
+sc/+ec) and/or rows (
+sr/+er), POV-Ray generates a full width image and fills the not rendered columns with black pixels. This should not be a problem for any image reading program no matter what file format is used. Earlier versions of POV-Ray had problems when a subset of rows (
+sr/+er) was rendered. The full height information was written into the image file header but it only wrote image data for those lines that were actually rendered. This made output files that were incompatible with various image processing tools. In version 3.7 this is no longer the case.
||Turn test for user abort on/off|
||Turn test abort on|
||Turn test abort off|
||Set to test for abort every n pixels|
||Set to test for abort every n pixels on|
||Set to test for abort off (in future test every n pixels)|
On some operating systems once you start a rendering you must let it
Test_Abort=on option or
causes POV-Ray to test the keyboard for keypress. If you have pressed a key,
it will generate a controlled user abort. Files will be flushed and closed
but only data through the last full row of pixels is saved. POV-Ray exits
with an error code 2 (normally POV-Ray returns 0 for a successful run or 1
for a fatal error).
When this option is on, the keyboard is polled on every line while parsing
the scene file and on every pixel while rendering. Because polling the
keyboard can slow down a rendering, the
Test_Abort_Count=n option or
causes the test to be performed only every n pixels rendered or
scene lines parsed.
||Sets continued trace on/off|
||Sets continued trace on|
||Sets continued trace off|
||Generate an INI file to file|
||Generate file.ini where file is scene name.|
||Turn off generation of previously set file.ini|
If you abort a render while it is in progress or if you used the
End_Row option to end the render prematurely, you can use
+C option to continue the render
later at the point where you left off. This option reads in the previously
generated output file, displays the partial image rendered so far, then
proceeds with the ray-tracing. This option cannot be used if file output is
Continue_Trace option may not work if the
option has been set to anything but the top of the file, depending on the output format being used. Also POV-Ray cannot continue the file once it has been opened and saved again by any program
POV-Ray tries to figure out where to resume an interrupted trace by reading
any previously generated data in the specified output file. All file formats
contain the image size, so this will override any image size settings
specified. Some file formats (namely TGA and PNG) also store information
about where the file started (i. e.
+SRn options), alpha output
+UA, and bit-depth
+FNn, which will override these settings. It is up to
the user to make sure that all other options are set the same as the original
Create_Ini option or
+GI switch provides an
easy way to create an INI file with all of the rendering options, so you can
re-run files with the same options, or ensure you have all the same options
when resuming. This option creates an INI file with every option set at the
value used for that rendering. This includes default values which you have
not specified. For example if you run POV-Ray with...
POVRAY +Isimple.pov MYOPTS +GIrerun.ini MOREOPTS
POV-Ray will create a file called
rerun.ini with all of the
options used to generate this scene. The file is not written until all
options have been processed. This means that in the above example, the file
will include options from both
moreopts.ini despite the fact that the
+GI switch is
specified between them. You may now re-run the scene with...
or resume an interrupted trace with
POVRAY RERUN +C
If you add other switches with the
rerun.ini reference, they
will be included in future re-runs because the file is re-written every time
you use it.
Create_Ini option is also useful for documenting how a
scene was rendered. If you render
Create_Ini=on then it will create a file
you could distribute along with your scene file so other users can exactly
re-create your image.