Value reading Node

[hype]

I’ve used this and found it extremely useful.

How to visualize a value resulted from math node?

The blend file is there to download.

[kesonmis]

@lsscpp

I tried to sample the 3d preview output with the eyedropper of a RGB input node but it clamps everything to 0-1, and also it’s not precise: a math node set to add 0.4+0.5 gave me 0.905 R, G and B each. And 0.896 sampling in the material preview panel.

Sampled colors are already color managed, to get the exact result as the shader calculates it, set display device to None in Color Management subpanel. It does not look “right” but you will get correct values when sampling with eyedropper tool. To get around the clipping, set Exposure slider to some negative value and compensate the sampled value with exposure. For example exposure -5 (2^-5 = 1/32) would mean that sampled value must be multiplied with 32 (2^5=32).

[lsscpp]

@kesonmis

Sampled colors are already color managed, to get the exact result as the shader calculates it, set display device to None in Color Management subpanel. It does not look “right” but you will get correct values when sampling with eyedropper tool. To get around the clipping, set Exposure slider to some negative value and compensate the sampled value with exposure. For example exposure -5 (2^-5 = 1/32) would mean that sampled value must be multiplied with 32 (2^5=32).

wow, thanks!

[lajawi]

@Miatpi

I have thought about this too and my idea is about not having a node to output the values but simply having the values pop up while holding your cursor over the node link (maybe pressing some button like shift).
There could also be an option to enable these boxes to constantly show for all node links.
While this probably wouldn’t commonly be used I’m sure it would be a life-saver sometimes.

And about that output values rarely are a single value that could be solved by having the interval of these values shown instead. For instance say I have a grayscale texture with values ranging from 0 to 1 (white to black). If I were to show the value of it I would get the simple intervall “0-1”.
If I then were to multiply it with 0.5 I would get the interval “0-0.5” and so forth.

@Miatpi why not make a node that outputs all values, or some at least, so we can check the different values. I made a plane with an emission node with a sweeping animatino using math nodes and a gradient texture, only two values would be outputted there, and I would like to check them.