Render - Crop Tab
The settings on the Crop tab let you crop the rendering to a specific part of an image. Only parts of the scene inside the crop region are rendered. Using the crop region can be useful in several ways. You can use it to render just a small part of an image to preview it or check something. You can use it to re-render a specific part of an image. You could also use it to divide an image into several parts to be rendered on multiple machines, although it is better to use the tile options on the command line for this purpose.
The positions of the crop region edges are set as a proportion of image size, rather than by specifying the size in pixels. The position values run from 0 to 1. The top or left side of the image is 0. The right or bottom side of the image is 1. Let's say you want to render only the left half of an image. Set the top to 0 and the bottom to 1 to render the full height of the image. Now set the left to 0 and the right to 0.5. 0.5 is halfway across the image.
An easier way to set the crop region edges is to use the 3D Preview. When you check Do crop region the crop region is drawn in red on the 3D Preview. You can click and drag to resize the crop region in the preview.
- Do crop region: If this is checked the render will be cropped specified in the fields below.
- Crop left: This sets the position of the left side of the crop region.
- Crop right: This sets the position of the right side of the crop region.
- Crop bottom: This sets the position of the bottom side of the crop region.
- Crop top: This sets the position of the top side of the crop region.
- Crop to object: If this is checked the render will be cropped to the bounding box of the assigned object. Please note that the object must be TG's built-in Sphere object. If you use some other sort of object the render won't be cropped.
Back to: Render
The bounding box is a box which surrounds (or bounds) an object or shader. This box shows the maximum extents of the item inside it. Sometimes abbreviated as "b-box".