VRay for SketchUp Manual
Resolution of the Image
Image size setting
V-Ray can ignore the size set up in SketchUp. Open V-Ray for SketchUp's
Render Options. Pull down the Output control menu and check the box for Override
Viewport to have V-Ray define the image size.
There are several size presets in V-Ray to choose from. User can also set the
size themselves. The unit used is pixel. The Image Aspect value is the
height-width ratio for current size. Click on the “L” to lock in this ratio. Now
when either the height or width is changed, V-Ray will calculate the other value
automatically according to this ratio.
Saving your image
Check the Save File under the Render Output and then click on the "…" to set
up the file saving path, type and file name. When V-Ray finishes rendering, the
file will be saved accordingly. Please note that next rendering will override
the previous one with the exact same path, type and name.
The Pixel Aspect option controls the height and width ratio of the pixel.
Here are two examples: