How many passes should be used for a render? Meaning how many passes is the usual before it won't make a difference?
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How many passes should be used for a render? Meaning how many passes is the usual before it won't make a difference?
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There is no quick answer to this. For most models, which include reflection, and indirect lighting, more and more passes will make a better rendering.
Simple Exterior Scene
In this example, with sun light, but no reflections and no indirect lighting, thre is no difference between 2 and 10 passes.
Rendering after 2 passes
Rendering after 10 passes
Reflected Spot Light
In this example, with a spot light reflecting from the far wall, the lighting does not start to smooth out until about 50 passes. And even more passes woud create a smoother effect
Rendering with just 3 lighting passes.
This starts to show the effect of indirect lighting, but still has harsh shadows
on the right hand wall.
Rendering after 50 lighting passes. Rendering is fairly smooth and the
shadow on the right hand is invisible.