Wu Yang wrote:

> Thank you for your reply.

> Now I need set the camera far from the object, so the object is very small.
> But I still want to get enough intersection points. 


Distance of camera to object may be irrelevant with an orthographic 
camera. The angle of the camera might rather interfer too.
(telephoto lens have a very small angle).

But if your object is only 10x10 pixels on the final renders, you won't 
be able to see much details. Using Antialiasing will just shoot more 
rays at it and performs some integration, but at the end a pixel can 
only have one colour.
Increasing the image size would be better for the details (especially if 
you keep antialiasing too!).

> Can I set the resolution
> as high as I want and what modifications do I need? Thanks.


You can set the image size as big as you want (reasonnably for your 
computer anyway) and there is no need for any modification.
See the +H and +W switches in the pov-help.

Image resolution of 10000 x 10000 have been done with Povray.
You just need the disc space to store it...

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