Chapter 17. Rendering
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## Chapter 17. Rendering

Relevant to Blender v2.31

Rendering is the final process of CG (short of postprocessing, of course) and is the phase in which the image corresponding to your 3D scene is finally created.

The rendering buttons window is accessed via the Scene Context and Render Sub-context (F10 or the button). The rendering Panels and Buttons are shown in Figure 17.1, “Rendering Buttons.”.

Figure 17.1. Rendering Buttons.

The rendering of the current scene is performed by pressing the big `RENDER` button in the `Render` panel, or by pressing F12. The result of the rendering is kept in a buffer and shown in its own window. It can be saved by pressing F3 or via the `File`>>`Save Image` menu.

The image is rendered according to the dimensions defined in the `Format` Panel (Figure 17.2, “Image types and dimensions.”).

Figure 17.2. Image types and dimensions.

By default the dimensions `SizeX` and `SizeY` are 320x256 and can be changed as for any Num Button. The two buttons below define the aspect ratio of the pixels. This is the ratio between the X and Y dimensions of the pixel of the image. By default it is 1:1 since computer screen pixels are square, but can be varied if television shorts are being made since TV pixels are not square. To make life easier the rightmost block of buttons (Figure 17.3, “Image pre-set dimensions.”) provides some common presets:

Figure 17.3. Image pre-set dimensions.

- `PAL` 720x576 pixels at 54:51 aspect ratio.

- `NTSC` 720x480 pixels at 10:11 aspect ratio.

- `Default` Same as PAL, but with full TV options, as explained in the following sections.

- `Preview` 640x512 at 1:1 aspect ratio. This setting automatically scales down the image by 50%, to effectively produce a 320x256 image.

- `PC` 640x480 at 1:1 aspect ratio.

- `PAL 16:9` 720x576 at 64:45 aspect ratio, for 16:9 widescreen TV renderings.

- `PANO` Standard panoramic settings 576x176 at 115:100 aspect ratio. More about 'panoramic' renderings in the pertinent section.

- `FULL` 1280x1024 at 1:1 aspect ratio.

## Rendering by Parts

Relevant to Blender v2.31

It is possible to render an image in pieces, one after the other, rather than all at one time. This can be useful for very complex scenes, where rendering small sections one after the other only requires computation of a small part of the scene, which uses less memory.

By setting values different from 1 in the `Xparts` and `Yparts` NumButtons in the `Render` Panel (Figure 17.4, “Rendering by parts buttons.”), you force Blender to divide your image into a grid of `Xparts` times `Yparts` sub-images, which are then rendered one after the other and finally assembled together.

Figure 17.4. Rendering by parts buttons.

### Note

Blender cannot handle more than 64 parts.

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