Rendering Tips

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General Rendering Tips

  • Disable sunlight when rendering underground scenes or indoor scenes where there is no visible natural light. This will increase the average number of Samples Per Second (SPS) rendered.
  • Disable emitters to greatly decrease the required render time. This however disables all light emitting blocks such as torches, lava etc.
  • Disable gamma correction during long renders to speed up the rendering process. When the image starts to get finished gamma correction can be re-enabled again without losing progress.
  • Increase the Ray Depth if you have a scene with many transparent or shiny blocks.

CPU Usage

The rendering technique used in Chunky (Path Tracing) is very CPU intensive. Therefore, to maximize the speed and efficiency of a render, all CPU threads should be utilized at 100%. If you would like to run Chunky in the background, you can adjust how much CPU is allocated to Chunky. Visit the Advanced Render Controls page for more information on how to do this.

Composing a Shot

Canvas Size

It is quite useful to "preview" your render at lower resolutions to avoid wasted hours rendering a test. Be sure to use the same image aspect ratio as you plan to have with your final render. Setting the canvas size smaller, greatly reduces the amount of CPU power needed to preview the image. To quickly scale the canvas (while keeping the aspect ratio), use the "Halve" and Double" buttons found on the Render Controls - General tab.

The Rule of Thirds


Camera / Exposure Settings


Manually Adjusting DoF

QuestionMarkIcon.png Focal offset is used to manipulate the distance from the camera to the focal plane. The Render Preview window displays the targeted distance in the lower left hand side, but can sometimes be misleading for shots at great distances. The following is a simple manual method for setting a correct focal offset. If you don't want to mess around with these parameters, use the "Autofocus" button. See also Camera Controls.


Start by setting DoF to a low value.


Now adjust FoV to zoom in on the point where you want focus.


Try to find a focal offset that causes the image to be rendered mostly sharply, then fine-tune the offset to get it right where you want it.


Last, zoom out to the original field of view setting. Adjust DoF so that you get the desired depth effect (look for example, at objects in the foreground/background and adjust DoF until they are as blurry or sharp as you want them to be).

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