V-Ray Render Engine Differences and DPI Settings

[noah_lee]

Hi,

I was wondering if someone could clarify the differences and benefits of the V-Ray render engines available (CPU/CUDA/GPU).
I’ve noticed that only the CPU render engine allows certain options such as different “Primary Rays” settings under “Global Illumination”, or the “Ambient Occlusion Setting”. Why is that?
Is there a quality/time difference between the render engines?

Also, does V-Ray have adjustable settings for render/output dpi? There seems to be an adjustable setting for dpi on Rhino’s render tab under “Resolution and Quality”, but there are no such settings (at least when I’ve tried looking) in V-Ray’s asset editor. I am unsure if the dpi settings on Rhino’s render tab would change things in V-Ray, as I have read elsewhere that V-Ray always renders in 72 dpi. Can anyone confirm or elaborate on this?

[^Lele^]

I was wondering if someone could clarify the differences and benefits of the V-Ray render engines available (CPU/CUDA/GPU).
I’ve noticed that only the CPU render engine allows certain options such as different “Primary Rays” settings under “Global Illumination”, or the “Ambient Occlusion Setting”. Why is that?
Is there a quality/time difference between the render engines?

Yes, it's however something not easily summed up.
Feel free to peruse the forums to get a clearer idea.

Also, does V-Ray have adjustable settings for render/output dpi? There seems to be an adjustable setting for dpi on Rhino’s render tab under “Resolution and Quality”, but there are no such settings (at least when I’ve tried looking) in V-Ray’s asset editor. I am unsure if the dpi settings on Rhino’s render tab would change things in V-Ray, as I have read elsewhere that V-Ray always renders in 72 dpi. Can anyone confirm or elaborate on this?

DPI are a measure of density, so they make sense when one has a physical size to adhere to (f.e. an A4 sheet of paper to print on, which is measured in cm.).
In the land of rendering, all you will ever need is the density times the size, or -to be as plain as possible- the dimensions in pixels.
Some may offer you to specify those as physical dimensions (A4) times DPI (300), but all those are are translations of the same quantity: Pixels to render.