How to render primitive / shape index maps without antialiasing?

[ShnitzelKiller]

The docs mention that the value of the prim_index and shape_index are meaningless with fractional pixel coverage. Is there some way to ensure that this integrator does not antialias / supersample at all, so that the output is purely integer values that can be trusted? I tried setting spp=1, and have no reconstruction filters, but there are still fractional valued pixels.

[njroussel]

Hi @ShnitzelKiller

Specifying no reconstruction filter will default to a gaussian filter (see here). You want to use a box filter to get such a result.