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[bug?]Unintuitive mapping ranges

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Sphinx.
Filter Optimizer

Posts: 1750
Filters: 39
Take a look at the results below. It might be "by design", but I'd expect setup no 2 or 3 to produce the result of no 1.

Njyldgarkn init/prepare process x no. of render blocks x no. of passes
Posted: June 16, 2017 1:57 am   Details E-Mail
GMM
Moderator
Filter Forge, Inc
Posts: 3491
No, this is not a bug.
If you keep in mind that everything in the digital world starts with 0, it will become more intuitive smile:) That is, feeding 0 into the green list yields the first list item, feeding 1 yields the second one etc.

This is what I wrote in the help file:

When a map component is connected to this input, the number of the selected list item is determined separately for different image areas by the HDR brightness level of the image supplied by that component. The item number is calculated as the brightness level rounded to the nearest integer: the brightness level of 0 to 0.5 corresponds to the first item, the level of 0.5 to 1.5 to the second item, and 1.5 to 2.5 to the third item. Out-of-range values are clipped, which corresponds to the last item of the list.

(feel free to suggest better wording.)

Attached is a filter to illustrate my point.

Mapping Explained.ffxml
Posted: June 16, 2017 7:31 am   Details E-Mail
Sphinx.
Filter Optimizer

Posts: 1750
Filters: 39
Okay, yeah I figured that was the logic. I would find truncation more logical in this case though:

0.x => List Item 0
1.x => List Item 1
2.x => List Item 2

(speaking zero based here)

But really - any of the approaches acceptable as long as you're consistent (which I wanted to check).

Those new changes are most welcome smile:-)
Njyldgarkn init/prepare process x no. of render blocks x no. of passes
Posted: June 16, 2017 7:51 am   Details E-Mail

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