Math "fraction" and "modulo of one" node outputs 1.000 #98877

New Issue

Avi Cohen · 2022-06-14T11:34:17+02:00

Avi Cohen commented

2022-06-14 11:34:17 +02:00

System Information
Operating system: Windows 11
Graphics card: NVIDIA GeForce RTX 3080 Laptop GPU

Blender Version
Broken: 3.2.0

Short description of error
Math "fraction" node and "modulo of one" can output one, it probability has to do with precision.
It's happening when trying to perform on fractions bigger than 0.9995.
The same problem for both shader nodes and geometry nodes.

Example and way to reproduce:

input: 0.9995 output: 0.999
input: 0.9996 output: 1.000
$math fraction output one.jpg$

Work around
Work around for the mean time, you can use "less than" and multiply the resalt by the fraction resalt. i've found threshold value of 0.9995 to work.

this if basically the same as doing:
if fraction is greater than 0.9995 return 0 else return the fraction

**System Information** Operating system: Windows 11 Graphics card: NVIDIA GeForce RTX 3080 Laptop GPU **Blender Version** Broken: 3.2.0 **Short description of error** Math "fraction" node and "modulo of one" can output one, it probability has to do with precision. It's happening when trying to perform on fractions bigger than 0.9995. The same problem for both shader nodes and geometry nodes. Example and way to reproduce: 1) input: 0.9995 output: 0.999 2) input: 0.9996 output: 1.000 ![math fraction output one.jpg](https://archive.blender.org/developer/F13161407/math_fraction_output_one.jpg) **Work around** Work around for the mean time, you can use "less than" and multiply the resalt by the fraction resalt. i've found threshold value of 0.9995 to work. this if basically the same as doing: if fraction is greater than 0.9995 return 0 else return the fraction ![work around.jpg](https://archive.blender.org/developer/F13161686/work_around.jpg)

Avi Cohen commented

2022-06-14 11:34:17 +02:00

Added subscriber: @AviCohen

Iliya Katushenock commented

2022-06-14 11:53:19 +02:00

Added subscriber: @mod_moder

Iliya Katushenock commented

2022-06-14 11:53:19 +02:00

This is not a bug, but a problem of format accuracy limitations?

Avi Cohen commented

2022-06-14 12:03:06 +02:00

if you mean it's the format of the output than no, it actually affects the result
without the work around

with the work around

by the way, for the work around i ment "less than" not "bigger than". i will fix it in the discription.

if you mean it's the format of the output than no, it actually affects the result without the work around ![1.jpg](https://archive.blender.org/developer/F13161678/1.jpg) with the work around ![2.jpg](https://archive.blender.org/developer/F13161680/2.jpg) by the way, for the work around i ment "less than" not "bigger than". i will fix it in the discription.

Scurest commented

2022-06-15 02:34:31 +02:00

Added subscriber: @scurest

Scurest commented

2022-06-15 02:34:31 +02:00

This works for me. To rule out being a formatting issue, can you put a multiply x1000 node in front of the fraction node and check the spreadsheet? If the fraction output is really 0.9997, the multiply will make it 999.700.

This works for me. To rule out being a formatting issue, can you put a multiply x1000 node in front of the fraction node and check the spreadsheet? If the fraction output is really 0.9997, the multiply will make it 999.700. ![nodes3.png](https://archive.blender.org/developer/F13165630/nodes3.png)

Germano Cavalcante commented

2022-06-16 01:58:59 +02:00

Added subscriber: @mano-wii

Germano Cavalcante commented

2022-06-16 01:58:59 +02:00

Changed status from 'Needs Triage' to: 'Archived'

Germano Cavalcante closed this issue

2022-06-16 01:58:59 +02:00

Germano Cavalcante commented

2022-06-16 01:58:59 +02:00

I'm not seeing a bug here.
For me what is happening is: The numbers in the Spreadsheet interface only have space for 3 decimal places, so, for visualization, it rounds the value.

The actual value is not affected.

I'm not seeing a bug here. For me what is happening is: The numbers in the Spreadsheet interface only have space for 3 decimal places, so, for visualization, it [rounds ](https://en.wikipedia.org/wiki/Rounding) the value. The actual value is not affected.

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Math "fraction" and "modulo of one" node outputs 1.000 #98877