On 1/26/24 12:17, kurtz le pirate wrote:
> Any idea how to avoid this problem ?

In the end you have to shoot enough rays to 'see' the grid lines for 
them to show up in the resulting image. For the grid lines to always 
look good / consistent you might have to shoot enough rays that for each 
pixel a significant percentage of the pixel's rays see the grid lines.

In official releases of POV-Ray, you can set an AA threshold value of 
0.0 and a sampling depth such that at smaller image sizes you 
effectively shoot as many rays as you would rendering a larger image.

Bill P.

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